Vector

Vector O N - L I N E

M A N U A L

Copyright  1982 - 1999 by ERDAS, Inc. All rights reserved. Printed in the United States of America. ERDAS Proprietary - Delivered under license agreement. Copying and disclosure prohibited without express written permission from ERDAS, Inc. ERDAS, Inc. 2801 Buford Highway, N.E. Atlanta, Georgia 30329-2137 USA Phone: 404/248-9000 Fax: 404/248-9400 User Support: 404/248-9777

Warning All information in this document, as well as the software to which it pertains, is proprietary material of ERDAS, Inc., and is subject to an ERDAS license and non-disclosure agreement. Neither the software nor the documentation may be reproduced in any manner without the prior written permission of ERDAS, Inc. Specifications are subject to change without notice.

Trademarks ERDAS is a trade name of ERDAS, Inc. ERDAS and ERDAS IMAGINE are registered trademarks of ERDAS, Inc. Model Maker, CellArray, ERDAS Field Guide, and ERDAS Tour Guides are trademarks of ERDAS, Inc. Other brands and product names are trademarks of their respective owners.

Vector On-Line Manual Vector Utilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Clean Vector Layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Build Vector Layer Topology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Copy Vector Layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 External Vector Layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Rename Vector Layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Delete Vector Layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 VectorInfo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Subset Vector Layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Mosaic Polygon Coverages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Transform Vector Layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Creating an Output Coverage . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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Create Polygon Labels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Raster to Vector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Vector to Raster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Table Tool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Import ASCII File To Point Coverage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Vector Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

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Vector On-Line Manual Vector Tools (Large Format) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 Vector Tools and Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 Vector Tools and Commands (Large Format) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 Vector Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 Vector Attribute Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 Column Attributes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 Merge Attributes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 Export Attributes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 Properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59 Select Vector Symbology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 Save Symbology As ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 Symbology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 Edit Expression . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67 Number of Symbology Classes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 Equation Evaluation Precision . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71 Equal Divisions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 Equal Counts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73 Unique Value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

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Vector On-Line Manual Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 Save Layer As ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 Create New Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78 Edit Column . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79 Open Info Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80 Save Table As . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81 Add Rows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82 Add Column . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83 New Column . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84 Copy Info Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85 Rename Info Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86 Delete Info Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87 Merge Info Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88 Relate Manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89 Edit Relate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91 Creating New Relate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92 Open New Relates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93 Save Relates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94

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Vector On-Line Manual Define Projection Parameters of the Coverage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95 Re-Project Coverage Coordinates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96 Specify a Clip Coverage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97 Specify a Template Coverage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98 Raster to ARC/INFO Coverage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99 Convert Vector Layer to Raster Layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

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Vector Utilities

Vector Utilities This dialog gives you access to the vector utilities. To access this dialog, click on the Vector icon on the ERDAS IMAGINE icon panel

☞ Do NOT run any vector utility on a vector layer which is currently opened in a Viewer. Close the vector layer first.

☞ (PC Only) Do not set the Scratch File Directory to an old PC Arc/Info (pre 3.5, using VectorInfo for attributes) workspace when it contains old PC coverage data. Some vector utility programs such as Mosaic Polygon Layers may convert it into a new workspace (Unix Arc/Info workspace), which results in ERDAS IMAGINE being unable to read the old PC coverages in that workspace. If this happens, remove the “arc.dir” file from the “info” directory to convert it back to an old workspace. You can set the Scratch File Directory in the Vector preferences.

☞ (Windows NT Only) PC coverages (pre-3.5 and 3.5.x) can be displayed and edited, but they cannot be built or cleaned in ERDAS IMAGINE. This is because most vector utilities (all except Copy, Rename, Delete, and External) are not implemented for PC coverages. All vector importers (DXF, DLG, TIGER, etc.) generate UNIX coverages only.

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(PC Only) ERDAS IMAGINE can work with three different versions of Arc/Info coverages (PC pre-3.5, PC 3.5 and plus, and UNIX coverages). To avoid confusion, do not mix them in the same workspace. When running Vector Utility programs or Vector Importers that generate output coverage(s) (such as Clean, Mosaic, Import DXF), do not write the output coverages into a PC pre-3.5 workspace, because the output are UNIX coverages. If such a mixture occurs, copy (use Copy Vector Layer utility) the UNIX coverages to a proper workspace, then rename the arc.dir file in the info directory of the original workspace to an arbitrary name like junk.dir to repair the workspace. How to recognize different versions of coverages: 1. PC 3.5 and plus coverage: It contains files with the .dbf extension. 2. UNIX coverages: The info directory contains a file named arc.dir (version 7.x) or arcdr9 (version pre-7.0), or it contains files with the .adf extension (version 7.x). 3. PC Pre-3.5 coverages: The info directory contains a file named arc.dr9

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Vector Utilities

Clean Vector Layer... Click to create topology for a polygon or line vector layer. The Clean Vector Layer dialog is opened. This option should be used only if the Build Vector Layer Topology function is inadequate.

☞ The Clean Vector Layer... utility is not available under Windows 95. Build Vector Layer Topology... Click to create the topology for a polygon, point, line, or node vector layer. The Build Vector Layer Topology dialog is opened.

☞ The Build Vector Layer Topology... utility is not available under Windows 95. Copy Vector Layer... Click to copy a vector layer. The Copy Vector Layer dialog is opened.

External Vector Layer... Click to correct the external file path names for a vector layer’s INFO files. The External Vector Layer dialog is opened.

Rename Vector Layer... Click to rename a vector layer. The Rename Vector Layer dialog is opened.

Delete Vector Layer... Click to delete a vector layer and attribute information. The Delete Vector Layer dialog is opened.

Display Vector Layer Info... Click to display information about a vector layer. You can also add projection information to a vector layer or reproject a vector layer using this option. The Vector Info dialog is opened. This option is similar to the Image Info utility for viewing information about raster data.

Subset Vector Layer... Click to create a new vector layer by specifying the layer to subset and a clip coverage. The Subset Vector Layer dialog is opened.

☞ The Subset Vector Layer... utility is not available under Windows 95. Mosaic Polygon Layers... Click to mosaic up to 500 polygon layers together. The Mosaic Polygon Coverages dialog is opened.

☞ The Mosaic Polygon Layers... utility is not available under Windows 95. Transform Vector Layer... Click to warp a vector layer from digitizer coordinates to real-world coordinates based on a set of control points (tics). The Transform Vector Layer dialog is opened.

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Vector Utilities

☞ The Transform Vector Layer... utility is not available under Windows 95. Create Polygon Labels... Click to create label points for a polygon coverage. The Create Polygon Labels dialog is opened.

☞ The Create Polygon Labels... utility is not available under Windows 95. Raster to Vector... Click to convert a raster layer to a vector layer. The Raster to Vector dialog is opened.

☞ The Raster to Vector... utility is not available under Windows 95. Vector to Raster... Click to convert a vector layer to a raster layer. The Vector to Raster dialog is opened.

☞ The Vector to Raster... utility is not available under Windows 95. Start Table Tool... Click to view or edit the INFO table. The Table Tool dialog is opened. ☞ The Start Table Tool... utility is not available under Windows 95. Zonal Attributes... Click to extract the zonal statistics of the background image of a polygon coverage and save them as polygon attributes. The Save Zonal Statistics To Polygon Attributes dialog is opened.

ASCII to Point Vector Layer... Click to create a point coverage from an ASCII file. The Import ASCII File To Point Coverage dialog is opened. ☞ The ASCII to Point Vector Layer... utility is not available under Windows 95. Close Click to close this dialog. Help Click to see this On-Line Help document. ➲ For information on using the ERDAS IMAGINE graphical interface, see the on-line IMAGINE Interface manual.

➲ For step-by-step instructions on using the IMAGINE Vector module, see the ERDAS IMAGINE Tour Guides manual.

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Clean Vector Layer

Clean Vector Layer The Clean utility enables you to construct topology for an ERDAS IMAGINE vector layer. Clean processes lines and polygons. It also creates intersections (nodes) where lines cross. Clean is a slower process than the Build Vector Layer Topology utility, but should be used if the layer has undergone major edits.

☞ Do NOT clean a coverage while it is opened in the Windows Explorer. (Windows only) ☞ Do NOT clean a coverage while it is opened in the Viewer. If the input file contains attribute information, it is automatically updated. If the layer does not contain attribute information, it is created.

☞ Build or Clean must be run on all layers that are imported into ERDAS IMAGINE from other sources, such as DLG, DXF, TIGER, etc.

☞ (Windows NT Only) PC coverages (pre-3.5 and 3.5.x) can be displayed and edited, but they cannot be built or cleaned in ERDAS IMAGINE. This is because most vector utilities (all except Copy, Rename, Delete, and External) are not implemented for PC coverages. All vector importers (DXF, DLG, TIGER, etc.) generate UNIX coverages only. This dialog is opened when you click on Clean Vector Layer in the Vector Utilities dialog.

☞ Clean Vector Layer is not available under Windows 98 or Windows 2000. ☞ In ERDAS IMAGINE filename parts, you can enter a wildcard with the following extensions to search for ARC/INFO data: *.arcinfo to search for ARC/INFO coverages (IMAGINE vector layers) *.grid to search for GRIDs *.stk to search for a stack of GRIDs *.vpf to search for VPF data *.wksp to search for workspaces These are not the actual file extensions used on these files. They are simply cues that tell IMAGINE the type of data for which you are searching.

Input Coverage: Enter the file name of the input vector layer to clean. Write to New Output. Click this check box to create a new output file. If this option is selected, you must enter the new output file name in the file name part, otherwise the file name part is disabled.

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Clean Vector Layer

Feature: Click on this popup list to select the type of feature contained in the layer that you want to clean. Polygon Line

The layer to clean contains polygons.

The layer to clean contains lines.

Fuzzy Tolerance: Specify the minimum distance between the line vertices in the output layer. An intelligent default is calculated for you. Negative values and 0 are not accepted.

Dangle Length: Specify the minimum length allowed for dangling lines in the output layer. The default is 0. OK Click to run this process with the options selected and close this dialog. Batch

Click to include this process in a batch file.

Cancel Click to cancel this process and close this dialog. Help Click to see this On-Line Help document. ➲ For information on using the ERDAS IMAGINE graphical interface, see the on-line IMAGINE Interface manual.

➲ For step-by-step instructions on using the IMAGINE Vector module, see the ERDAS IMAGINE Tour Guides manual.

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Build Vector Layer Topology

Build Vector Layer Topology The Build utility allows you to construct topology for an ERDAS IMAGINE vector layer. Build processes points, lines, and polygons. Build is faster than Clean. It recognizes only existing intersections, therefore it does not create intersections as the Clean Vector Layer utility does. If there are any new intersections to be created, Build will not work. In these cases, use Clean instead.

☞ Do NOT build a coverage while it is opened in the Windows Explorer. (Windows only) ☞ Do NOT build a coverage while it is opened in the Viewer. If the input file contains attribute information, it is automatically updated. If the layer does not contain attribute information, it is created.

☞ Build or Clean must be run on all layers that are imported into ERDAS IMAGINE from other sources, such as DLG, DXF, TIGER, etc.

☞ (Windows NT Only) PC coverages (pre-3.5 and 3.5.x) can be displayed and edited, but they cannot be built or cleaned in ERDAS IMAGINE. This is because most vector utilities (all except Copy, Rename, Delete, and External) are not implemented for PC coverages. All vector importers (DXF, DLG, TIGER, etc.) generate UNIX coverages only. This dialog is opened when you click on Build Vector Layer Topology in the Vector Utilities dialog.

☞ Build Vector Layer Topology is not available under Windows 95. ☞ In ERDAS IMAGINE filename parts, you can enter a wildcard with the following extensions to search for ARC/INFO data: *.arcinfo to search for ARC/INFO coverages (IMAGINE vector layers) *.grid to search for GRIDs *.stk to search for a stack of GRIDs *.vpf to search for VPF data *.wksp to search for workspaces These are not the actual file extensions used on these files. They are simply cues that tell IMAGINE the type of data for which you are searching.

Input Coverage: Enter the file name of the input vector layer to build. Feature: Click on this popup list to select the type of feature topology to build for this layer.

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Build Vector Layer Topology Polygon Build polygon topology, creating or updating polygon attributes from the lines and label points in the coverage. Line Build line topology, creating or updating line attributes from the lines in the coverage. Point Build point topology, creating or updating point attributes from the points in the coverage.

OK Click to run this process with the options selected and close this dialog. Batch

Click to include this process in a batch file.

Cancel Click to cancel this process and close this dialog. Help Click to see this On-Line Help document. ➲ For information on using the ERDAS IMAGINE graphical interface, see the on-line IMAGINE Interface manual.

➲ For step-by-step instructions on using the IMAGINE Vector module, see the ERDAS IMAGINE Tour Guides manual.

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Copy Vector Layer

Copy Vector Layer ERDAS IMAGINE vector layers are based on the ARC/INFO Data Model. Since these are not simple files, but rather directories that contain several files, this utility is provided so that you can easily copy vector layers. This dialog is opened when you click on Copy Vector Layer in the Vector Utilities dialog.

☞ In ERDAS IMAGINE filename parts, you can enter a wildcard with the following extensions to search for ARC/INFO data: *.arcinfo to search for ARC/INFO coverages (IMAGINE vector layers) *.grid to search for GRIDs *.stk to search for a stack of GRIDs *.vpf to search for VPF data *.wksp to search for workspaces These are not the actual file extensions used on these files. They are simply cues that tell IMAGINE the type of data for which you are searching.

Vector Layer to Copy: Enter the name of the vector layer to copy. Output Vector Layer: Enter the name of the new output vector layer. OK Click to run this process with the options selected and close this dialog. Batch

Click to include this process in a batch file.

Cancel Click to cancel this process and close this dialog. Help Click to see this On-Line Help document. ➲ For information on using the ERDAS IMAGINE graphical interface, see the on-line IMAGINE Interface manual.

➲ For step-by-step instructions on using the IMAGINE Vector module, see the ERDAS IMAGINE Tour Guides manual.

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External Vector Layer

External Vector Layer This utility corrects the external file path names for a vector layer’s INFO files. When a vector coverage (or GRID file) is copied or moved to another place, the path names for the external files in the INFO directory are no longer correct. Use this function to update the path names. If the INFO directory is not copied to the same directory, this utility will create an INFO directory. Usergenerated attribute files will be lost so it is advisable to use the Copy Vector Layer option of the Vector Utilities menu to move the coverage around instead of using system commands. Also, do not externalize the coverage while the Viewer is trying to read and display it. This dialog is opened when you click on External Vector Layer in the Vector Utilities dialog.

☞ In ERDAS IMAGINE filename parts, you can enter a wildcard with the following extensions to search for ARC/INFO data: *.arcinfo to search for ARC/INFO coverages (IMAGINE vector layers) *.grid to search for GRIDs *.stk to search for a stack of GRIDs *.vpf to search for VPF data *.wksp to search for workspaces These are not the actual file extensions used on these files. They are simply cues that tell IMAGINE the type of data for which you are searching.

Vector Layer to External: Enter the file name of the geographic data set (coverage or GRID) whose INFO external file path names are to be corrected.

OK Click to run this process with the options selected and close this dialog. Batch

Click to include this process in a batch file.

Cancel Click to cancel this process and close this dialog. Help Click to see this On-Line Help document. ➲ For information on using the ERDAS IMAGINE graphical interface, see the on-line IMAGINE Interface manual.

➲ For step-by-step instructions on using the IMAGINE Vector module, see the ERDAS IMAGINE Tour Guides manual.

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Rename Vector Layer

Rename Vector Layer ERDAS IMAGINE vector layers are based on the ARC/INFO Data Model. Since these are not simple files, but rather directories that contain several files, this utility is provided so that you can easily rename vector layers. This dialog is opened when you click on Rename Vector Layer in the Vector Utilities dialog.

☞ Do NOT rename a coverage while it is opened in the Windows Explorer. (Windows only) ☞ You must rename layers to the same directory as the original layer. If you specify a new directory it will be ignored.

☞ In ERDAS IMAGINE filename parts, you can enter a wildcard with the following extensions to search for ARC/INFO data: *.arcinfo to search for ARC/INFO coverages (IMAGINE vector layers) *.grid to search for GRIDs *.stk to search for a stack of GRIDs *.vpf to search for VPF data *.wksp to search for workspaces These are not the actual file extensions used on these files. They are simply cues that tell IMAGINE the type of data for which you are searching.

Vector Layer to Rename: Enter the file name of the vector layer that you want to rename.

Output Vector Layer: Enter the new name for the vector layer. OK Click to run this process with the options selected and close this dialog. Batch

Click to include this process in a batch file.

Cancel Click to cancel this process and close this dialog. Help Click to see this On-Line Help document. ➲ For information on using the ERDAS IMAGINE graphical interface, see the on-line IMAGINE Interface manual.

➲ For step-by-step instructions on using the IMAGINE Vector module, see the ERDAS IMAGINE Tour Guides manual.

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Delete Vector Layer

Delete Vector Layer ERDAS IMAGINE vector layers are based on the ARC/INFO Data Model. Since these are not simple files, but rather directories that contain several files, this utility is provided so that you can easily delete vector layers.

☞ Make sure that the coverage is not displayed in the Windows Explorer before deleting it. (Windows only)

☞ Make sure that the coverage is not displayed in the Viewer before deleting it. This dialog is opened when you click on Delete Vector Layer in the Vector Utilities dialog.

☞ In ERDAS IMAGINE filename parts, you can enter a wildcard with the following extensions to search for ARC/INFO data: *.arcinfo to search for ARC/INFO coverages (IMAGINE vector layers) *.grid to search for GRIDs *.stk to search for a stack of GRIDs *.vpf to search for VPF data *.wksp to search for workspaces These are not the actual file extensions used on these files. They are simply cues that tell IMAGINE the type of data for which you are searching.

Vector Layer to Delete: Enter the vector layer that you would like to delete. Type of Deletion: Use this popup list to indicate which information to delete. All This option deletes the vector layer, its attribute tables, and all INFO files whose prefixes are the same as the vector layer. ARC

This option will delete the vector layer and its attribute tables.

INFO This option deletes all INFO files in the layer’s workspace INFO directory whose prefixes are the same as the layer specified. The vector layer geometry will not be deleted.

OK Click to run this process with the options selected and close this dialog. Batch

Click to include this process in a batch file.

Cancel Click to cancel this process and close this dialog. Help Click to see this On-Line Help document.

11

Delete Vector Layer

➲ For information on using the ERDAS IMAGINE graphical interface, see the on-line IMAGINE Interface manual.

12

VectorInfo

VectorInfo This dialog enables you to view information about vector coverages, as well as change or define coverage projection information. It is similar to the Image Info utility for raster layers.

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(PC Only) If you have used VectorInfo to edit and store attributes of a PC Arc/Info coverage (pre version 3.5), build or clean it before displaying it in PC Arcplot so that all edits are correctly reflected.

This dialog is opened when you click on Display Vector Layer Info... in the Vector Utilities menu. This dialog is also opened with current information displayed when you select Utility | Layer Info... in the Viewer menu bar or click on the top layer in the Viewer.

icon in the toolbar when a vector layer is the

File Click to select a coverage to view, print, or to close Vector Info. Open ... New ... Print Close

Click to open a coverage to view. The File Selector dialog is opened. Click to open a new Vector Info dialog.

Click to print vector layer information. Click to close the current Vector Info dialog.

Close All

Click to close all open Vector Info windows.

Edit Click to change or define coverage projection information. Add Coverage Projections ... Click to define the projection of the coverage. The Define Projection Parameters of the Coverage dialog is opened. Re-project the Coverage ... Click to re-project the coverage coordinates to a new projection system. The Re-project Coverage Coordinates dialog is opened.

Help Click to see this On-Line Help document. Help for VectorInfo

Click to view On-Line Help for Vector Info.

Click to open a vector coverage to view. The File Selector dialog is opened.

Click to close the Vector Info dialog.

13

VectorInfo

Click to print the vector information.

Click to close this Vector Info window.

General Tab Arcs, Polygons: Information about arcs and polygons is reported in this group. Arcs:

The number of arcs in this coverage is reported.

Polygons: Segments:

The number of polygons in this coverage is reported. The number of segments in the coverage is reported.

Poly. Topology:

Indicates whether polygon topology is Present or Absent.

Arc Attr. Data:

Indicates the number of bytes of the arc attribute data.

Poly Attr. Data:

Indicates the number of bytes of the polygon attribute data.

Status: Reports the status of the coverage and indicates whether it has, or needs, to be built or cleaned.

Other Features: This group provides information about the nodes, labels, and tics in the coverage. Nodes:

The number of nodes in the coverage is reported.

Label Points:

The number of label points in the coverage is reported.

Node Attr. Data:

Indicates the number of bytes of the node attribute data.

Point Attr. Data:

Indicates the number of bytes of the point attribute data.

Tics:

Lists the number of tics in the coverage.

Tolerance: This group reports the fuzzy tolerance and dangle length tolerance of the coverage. Fuzzy:

The fuzzy tolerance of the coverage is reported as either Verified or Unverified.

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VectorInfo Dangle: The dangling length tolerance is reported as Verified or Unverified. Verified signifies that this coverage has been processed using this tolerance and therefore reflects the actual resolution of the coordinates. Otherwise, the tolerance is unverified.

Boundary: This group reports information about the boundary of the coverage. Xmin:

The minimum X value in the coverage is reported.

Ymin:

The minimum Y value in the coverage is reported.

Xmax:

The maximum X value in the coverage is reported.

Ymax:

The maximum Y value in the coverage is reported.

Projection Info: Projection information, if present, is listed in this group. If this information is not present, it can be added by selecting Edit | Add Coverage Projections... or changed by selecting Edit | Re-project the Coverage .... Georeferenced to: Spheroid:

The name of the spheroid is listed.

Zone Number: Datum:

The map projection to which this coverage is referenced is listed.

For coverages registered to State Plane, the zone number is listed.

The datum used is reported.

Map Units:

The map units used in the coverage are reported.

Projection Tab This tab displays the parameters of the projection of the image. The parameters will vary depending on the projection type.

➲ For information on using the ERDAS IMAGINE graphical interface, see the on-line IMAGINE Interface manual.

➲ For step-by-step instructions on using many of the ERDAS IMAGINE vector tools, see the ERDAS IMAGINE Tour Guides manual.

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Subset Vector Layer

Subset Vector Layer This dialog enables you to create a new vector layer by subsetting (or clipping) an existing layer with a clip coverage. To access this dialog, click on Subset Vector Layer in the Vector Utilities dialog.

☞ Subset Vector Layer is not available under Windows 95. ☞ In ERDAS IMAGINE filename parts, you can enter a wildcard with the following extensions to search for ARC/INFO data: *.arcinfo to search for ARC/INFO coverages (IMAGINE vector layers) *.grid to search for GRIDs *.stk to search for a stack of GRIDs *.vpf to search for VPF data *.wksp to search for workspaces These are not the actual file extensions used on these files. They are simply cues that tell IMAGINE the type of data for which you are searching.

Input Coverage: Enter the name of the vector layer that you want to subset. Subset Coverage: Enter the name of the layer that will be used to define the subset. This MUST be a properly built polygon layer. The outer polygons of this file define the subset area.

Output Coverage: Enter the name of the new output coverage that will be created. Subsetting Features: Click on this popup list to define the features to be included in the new output coverage. Polygons Lines Points

Polygons and their attributes are saved in the new output coverage.

Lines and their attributes are saved in the new output coverage. Points and their attributes are saved in the new output coverage.

Raw Lines and points are saved in the new output coverage, but attribute information is ignored.

Fuzzy Tolerance: Specify the minimum distance between coordinates in the new output file. The default is 0.002. A fuzzy tolerance of 0 will not be accepted. 16

Subset Vector Layer

OK Click to run this process with the options selected and close this dialog. Cancel Click to cancel this process and close this dialog. Help Click to see this On-Line Help document. ➲ For information on using the ERDAS IMAGINE graphical interface, see the on-line IMAGINE Interface manual.

➲ For step-by-step instructions on using the IMAGINE Vector module, see the ERDAS IMAGINE Tour Guides manual.

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Mosaic Polygon Coverages

Mosaic Polygon Coverages This dialog enables you to combine up to 500 adjacent polygon coverages containing polygons and points, lines, and nodes into one coverage and recreate the topology. You can also specify a clip coverage to define the boundaries of the output coverage and a template coverage to specify which features to mosaic.

☞ The attribute tables for the input coverages must match. You should also ensure that edge coordinates, node coordinates, and polygon item values match between adjacent coverages. The dialog is opened when you click on Mosaic Polygon Layers... in the Vector Utilities dialog.

☞ Mosaic Polygon Coverages is not available under Windows 95. ☞ In ERDAS IMAGINE filename parts, you can enter a wildcard with the following extensions to search for ARC/INFO data: *.arcinfo to search for ARC/INFO coverages (IMAGINE vector layers) *.grid to search for GRIDs *.stk to search for a stack of GRIDs *.vpf to search for VPF data *.wksp to search for workspaces These are not the actual file extensions used on these files. They are simply cues that tell IMAGINE the type of data for which you are searching.

Select Input Covers: Select the coverages to mosaic from this list. Click on the coverage to include and it is listed in the Current Input Coverage List on the right side of the dialog.

Current Input Coverage List: The coverages to mosaic are listed in this list as they are selected from the Select Input Coverages list. None

Signifies that no coverages are selected for mosaicking.

Delete a Cover from the List

Click to delete the selected coverage from the input list.

Output Coverage: Enter a name for the new coverage that you are creating. Select Features to Merge: Select the features to merge from this group. POLYGONS selected. POINTS

Click to merge polygons and polygon attributes. This option must be

Click to merge points and their attributes.

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Mosaic Polygon Coverages LINES NODES

Click to merge lines (arcs) and their attributes. Click to merge nodes and their attributes.

Specify a clip coverage... Click to specify a clip coverage to define the boundary of the new coverage. The Specify a Clip Coverage dialog is opened.

Feature-IDs numbering method: Click on this popup list to indicate how feature-IDs and tic-IDs are to be numbered in the output coverage. Keep old feature & tic IDs

Keep old feature and tic-IDs as is in the new coverage.

Renumber feature IDs only

Renumber feature-IDs but do not renumber tic-IDs.

Renumber tic IDs only Renumber tic-IDs but do not renumber feature-IDs.When this option is selected, the first coverage encountered will not be renumbered, but consecutive coverages will be offset by one plus the highest value used so far. For example, if the largest tic value in the first coverage is 20, then all tic values in the second coverage will be offset by 20 + 1, or 21. Then, all tics in the third coverage will be offset by one plus the largest value used in the second coverage, and so forth. Renumber tic & feature IDs

Renumber both tic and feature-IDs in the new coverage.

Use template coverage Click to use a template coverage to specify the set of features to be mosaicked. Specify template coverage... If you have opted to use a template coverage, click here to specify the template to use. The Specify a Template Coverage dialog is opened.

OK Click to mosaic the listed coverages and close this dialog. Cancel Click to cancel this process and close this dialog. Help Click to see this On-Line Help document. ➲ For information on using the ERDAS IMAGINE graphical interface, see the on-line IMAGINE Interface manual.

19

Transform Vector Layer

Transform Vector Layer This dialog is opened when you click on Transform Vector Layer in the Vector Utilities dialog.

☞ Transform Vector Layer is not available under Windows 95. This dialog enables you to change vector coverage coordinates using an affine or projective transformation based on a set of tics. The function is often used to transform coverages created in digitizer units to real-world units in a particular projection. The transformation is accomplished using a least squares calculation.

♦ An affine transformation requires three or more tics. ♦ A projective transformation requires four or more tics, and is used only to transform coordinates digitized directly off high altitude aerial photography or aerial photographs of relatively flat terrain. It is recommended that you use at least one more than the minimum number of tics for the best results. Creating an Output Coverage The output file that you select must already contain tics in the output projection. Except for these tics, any other features in the output coverage will be replaced by features from the input coverage. The input coverage and the output coverage must both contain tic files with at least two tics that have the same tic IDs and represent corresponding tic locations in both coverages. These coverages do not have to have identical tics, only those tics with common tic IDs will be used in the transformation. Follow these steps to create the tic coverage in which the transformed features will be output. 1. Create a new vector coverage in the Viewer. By default, two tics will be created. If you create a new coverage on top of another coverage (e.g., the input coverage that will be used in the transformation), the new coverage will contain all of the tics from the underlying coverage. If you create a new coverage on top of a raster image that contains ground control points, those points will become tics in the new coverage.

20

Transform Vector Layer

2. If you need to add more tics to the coverage you are creating, use the tool palette

tool on the Vector

To enter specific tic coordinates, select Vector | Attributes... in the Viewer menu bar to bring up the Vector Attribute Table. In the Vector Attribute Table menu bar, select View | Tic Attributes. You can now enter specific tic coordinates and tic IDs. Only the tics in the input and output coverage that have the same tic IDs will be used in the transformation, therefore you may need to edit the tic IDs of the tics that you want to use. 3. Save the new vector coverage. You are now ready to perform the transformation.

☞ In ERDAS IMAGINE filename parts, you can enter a wildcard with the following extensions to search for ARC/INFO data: *.arcinfo to search for ARC/INFO coverages (IMAGINE vector layers) *.grid to search for GRIDs *.stk to search for a stack of GRIDs *.vpf to search for VPF data *.wksp to search for workspaces These are not the actual file extensions used on these files. They are simply cues that tell IMAGINE the type of data for which you are searching.

Input Coverage: Enter the name of the coverage whose coordinates are to be transformed.

Output Coverage: Enter the name of an existing tic coverage with tics. These tics will be used as the control points for the transformation. After running this process, this coverage will contain transformed coordinates for all input features.

Output Statistics File: Enter the name of the ASCII file in which to write the summary statistics of the transform.

Transform Method: Click on this popup list to specify the type of transformation. Affine

Click to specify an affine transformation. At least three tics are required.

Projective

Click to specify a projective transformation. At least four tics are required.

OK Click to perform the transformation and close this dialog. Batch

Click to include this process in a batch file.

21

Transform Vector Layer

Cancel Click to cancel this process and close this dialog. Help Click to see this On-Line Help document. ➲ For information on using the ERDAS IMAGINE graphical interface, see the on-line IMAGINE Interface manual.

➲ For step-by-step instructions on using the IMAGINE Vector module, see the ERDAS IMAGINE Tour Guides manual.

22

Create Polygon Labels

Create Polygon Labels This dialog enables you to create label points for a polygon coverage. It opens when you click on Create Polygon Labels in the Vector Utilities dialog.

☞ Create Polygon Labels is not available under Windows 95. ☞ You should run Build Vector Layer Topology after creating new labels to update the UserIDs in the PAT.

☞ In ERDAS IMAGINE filename parts, you can enter a wildcard with the following extensions to search for ARC/INFO data: *.arcinfo to search for ARC/INFO coverages (IMAGINE vector layers) *.grid to search for GRIDs *.stk to search for a stack of GRIDs *.vpf to search for VPF data *.wksp to search for workspaces These are not the actual file extensions used on these files. They are simply cues that tell IMAGINE the type of data for which you are searching.

Polygon Coverage: Enter the name of the coverage in which to create labels. ID Base: Enter the starting ID value to be assigned to new labels. The value entered will be the first User-ID for the first polygon encountered that does not have a label point. UserIDs are incremented by one as labels are created. Specify 0 (zero) to create new labels for all polygons. This is the default.

OK Click to create labels and close this dialog. Batch

Click to include this process in a batch file.

Cancel Click to cancel this process and close this dialog. Help Click to see this On-Line Help document. ➲ For information on using the ERDAS IMAGINE graphical interface, see the on-line IMAGINE Interface manual.

23

Raster to Vector

Raster to Vector This dialog enables you to convert an ERDAS IMAGINE raster layer to a vector layer. This dialog is opened when you click on Raster to Vector from the Vector Utilities dialog.

☞ Raster to Vector is not available under Windows 95. ☞ Vector layers created in this dialog that do not have map projection information cannot be overlaid onto the original image. Use the Vector Info utility to add projection information to a coverage.

☞ It is advised that you convert only thematic layers, since continuous layers may contain more features than are practical.

☞ In ERDAS IMAGINE filename parts, you can enter a wildcard with the following extensions to search for ARC/INFO data: *.arcinfo to search for ARC/INFO coverages (IMAGINE vector layers) *.grid to search for GRIDs *.stk to search for a stack of GRIDs *.vpf to search for VPF data *.wksp to search for workspaces These are not the actual file extensions used on these files. They are simply cues that tell IMAGINE the type of data for which you are searching.

Input Raster: Enter the file name of the input raster layer to convert. The default file extension is .img.

Output Vector: Enter the name of the new output vector layer. OK Click to run this process with the options selected and close this dialog. Cancel Click to cancel this process and close this dialog. Help Click to see this On-Line Help document. ➲ For information on using the ERDAS IMAGINE graphical interface, see the on-line IMAGINE Interface manual.

➲ For step-by-step instructions on using the IMAGINE Vector module, see the ERDAS IMAGINE Tour Guides manual.

24

Vector to Raster

Vector to Raster This dialog enables you to convert an ESRI ARC coverage to an ERDAS IMAGINE raster layer. This dialog is opened when you click on Vector to Raster in the Vector Utilities dialog.

☞ If you want to convert ESRI Shapefiles or SDE vectors to raster, you must use the Image Interpreter | Utilities | Vector to Raster function.

☞ Vector to Raster is not available under Windows 95. ☞ In ERDAS IMAGINE filename parts, you can enter a wildcard with the following extensions to search for ARC/INFO data: *.arcinfo to search for ARC/INFO coverages (IMAGINE vector layers) *.grid to search for GRIDs *.stk to search for a stack of GRIDs *.vpf to search for VPF data *.wksp to search for workspaces These are not the actual file extensions used on these files. They are simply cues that tell IMAGINE the type of data for which you are searching.

Input Vector: Enter the file name of the vector layer that you want to convert. Output Raster: Enter the name of the new output raster layer. OK Click to run this process with the options selected and close this dialog. Cancel Click to cancel this process and close this dialog. Help Click to see this On-Line Help document. ➲ For information on using the ERDAS IMAGINE graphical interface, see the on-line IMAGINE Interface manual.

➲ For step-by-step instructions on using the IMAGINE Vector module, see the ERDAS IMAGINE Tour Guides manual.

25

Table Tool

Table Tool The Table Tool is a utility for managing INFO files. It allows you to view, edit, relate, import or export, copy, join, rename, delete, and create INFO tables. You can access the Table Tool by selecting Start Table Tool... from the Vector Utilities menu.

☞ The Table Tool is not available under Windows 95. File Click to open a pulldown menu with the following options: New ... Click to create a new table. The Create New Table dialog opens. Open ... Click to open a table to view. The Open Info Table dialog opens. Clear

Click to close the current table and clear the CellArray display.

Close Click to close this window. Close All Click to close all windows. Save Click to save current editing. Save As... Click to save the table to a new data file. The Save Table As dialog opens.

Edit Click to open a pulldown menu with the following options: Enable Edit Click to enable table editing. Add Rows... Click to add new records/rows to the table. The Add Rows dialog opens. Add A Column... Click to add a new item/column to the table. The Add Column dialog opens. Delete Selected Rows Click to delete selected table records. Delete Selected Columns Click to delete selected table columns. Undo Last Edit Click to undo the last editing performed. Create New Table... Click to Create a new table from scratch. The Create New Table dialog opens. Copy Click to copy the currently selected columns to a buffer. Paste Click to paste the buffer into the currently selected columns. Select All Columns Click to select all columns for an operation. Deselect All Columns Click to deselect all columns.

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Table Tool Select All Rows Click to select all rows for an operation. Deselect All Rows Click to deselect all rows. Select Rows by Criteria... Click to select rows by criteria. The Select Criteria dialog opens.

Utilities Click to open a pulldown menu with the following options: Table Copy... Click to copy a table. The Copy Info Table dialog opens. Table Rename... Click to rename a table. The Rename Info Table dialog opens. Table Delete... Click to delete a table permanently. The Delete Info Table dialog opens. Table Merge... Click to join two tables into a single one. The Merge Info Tables dialog opens.

Relate Click to open a pulldown menu with the following options: Relate... Click to open the Relates Manager. Drop Click to drop the current last relate from view.

View Click to open a pulldown menu with the following options: New Window... Click to start a new table tool window.

Help Click to open a pulldown menu with the following options: Help for Table Tool

Click to view the On-Line Help for the Table Tool.

Click to open a table to view. The Open Info Table dialog opens.

Click to close the current table and clear the CellArray display. This is the same as selecting File | Clear from the menu bar.

Click to start another Table Tool window. This is the same as selecting View | New Window... from the menu bar.

Click to close this table tool window. This is the same as selecting File | Close from the menu bar.

27

Table Tool

Click to Save editing. This is the same as selecting File | Save from the menu bar.

Click to add a new item/column to the table. The Add Column dialog opens.

Click to add new records/rows to the table. The Add Rows dialog opens.

Click to delete the selected rows. This is the same as selecting Edit | Delete Selected Rows from the menu bar.

Click to delete the selected columns. This is the same as selecting Edit | Delete Selected Columns from the menu bar.

Click to copy the currently selected columns to a buffer. This is the same as selecting Edit | Copy from the menu bar.

Click to paste the buffer into the selected columns. This is the same as selecting Edit | Paste from the menu bar.

Click to undo the last editing performed. This is the same as selecting Edit | Undo Last Edit from the menu bar.

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Import ASCII File To Point Coverage

Import ASCII File To Point Coverage This dialog enables you to create a point coverage from an ASCII file. It opens when you select ASCII File to Point Layer... from the Vector Utilities menu.

☞ Import ASCII File TO Point Coverage is not available under Windows 95. Input ASCII File: Enter the name of the ASCII file that contains x and y coordinates of points or select an input file from the file list.

Output Point Coverage: Enter the name of the output point coverage or select the output point coverage from the file list.

Output Coverage Precision: Specify the output coverage precision. Single Double

OK Click to import the data. Cancel Click to close this Dialog and cancel the import. Help Click to view the On-Line Help for this dialog.

29

Vector Tools

Vector Tools This tool palette enables you to select vector features in a variety of ways and to edit features. The Options dialog allows you to set parameters that affect the operation of some of these tools. This tool palette is opened when you select Vector | Tools... from the Viewer menu bar or when you click the

icon on the Viewer tool bar when a vector layer is the top layer in the viewer.

To enter specific position and size parameters, you can press the space bar while drawing many vector objects and a dialog is opened allowing you to enter precise coordinates and size information.

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The Preference Editor allows you to select large or small tools. This tool palette is opened if you have selected small tools.

Click to select features. With the pointer tool selected, click on the feature you want to select. That feature will be highlighted in the color indicated in the Properties dialog. If the Attribute Table is open, selected items will also be highlighted in the CellArray. To add to your selection, shift-click on another feature. To deselect all items, click outside of the selection. If editing has been enabled the selected features may be transformed by manipulating the rotbox.

Click to place a point feature in a vector layer. Editing must be enabled before placing the point.

Click to place a tic mark in a coverage.

Click to draw new lines in a vector layer. Click to place points along the line where it changes direction. Double-click or middle-click (depending upon how your Preferences are set) to terminate the line. If enabled, node and arc snapping will be performed on the end points of the new line. Editing must be enabled before new lines can be drawn.

30

Vector Tools

Click to split a line into two lines. Click at the point where you want to split the line. The row for the original line is removed from the attribute table and two new rows are added to the end of the attribute table.

Click to replace a portion of a line. The portion of the existing line above the acute angle is removed, as in the example below.

Editing must be enabled before you can use this option.

Click to create a simple polygon in a vector layer. Editing must be enabled before you can use this option.

Click to use the region growing tool to create a polygon. The polygon “growth” is based on parameters set in the Region Growing Properties dialog.

Click to select multiple features within a rectangular area. The actual features that are selected depend on the Select By options that are set in the Options dialog. If Intersect is selected, then all features that are contained in or intersect the marquee outline are selected. If Contained In is selected, then only those features that are entirely within the boundaries of the marquee outline are selected.

Click to select multiple features within an elliptical area. The actual features that are selected depend on the Select By options that are set in the Options dialog.

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Vector Tools If Intersect is selected, then all features that are contained in or intersect the marquee outline are selected. If Contained In is selected, then only those features that are entirely within the boundaries of the marquee outline are selected.

Click to select multiple features within a polygonal area. The actual features that are selected depend on the Select By options that are set in the Options dialog. If Intersect is selected, then all features that are contained in or intersect the marquee outline are selected. If Contained In is selected, then only those features that are entirely within the boundaries of the marquee outline are selected.

Click to select line features that intersect the line that you draw.

Click to see this On-Line Help document.

When this icon is displayed, the selected tool remains active (locked) until you select another tool.

When this icon is displayed, the selected tool is active for one use only. The pointer tool automatically becomes active following the single use of the currently selected tool.

Close Click to close this dialog. ➲ For information on using the ERDAS IMAGINE graphical interface, see the on-line IMAGINE Interface manual.

➲ For step-by-step instructions on using the IMAGINE Vector module, see the ERDAS IMAGINE Tour Guides manual.

32

Vector Tools (Large Format)

Vector Tools (Large Format) This tool palette enables you to select vector features in a variety of ways and to edit features. The Options dialog allows you to set parameters that affect the operation of some of these tools. This tool palette is opened when you select Vector | Tools... from the Viewer menu bar or when you click the

icon on the Viewer tool bar when a vector layer is the top layer in the viewer.

To enter specific position and size parameters, you can press the space bar while drawing many vector objects and a dialog is opened allowing you to enter precise coordinates and size information.

i

The Preference Editor allows you to select large or small tools. This tool palette is opened if you have selected large tools.

Click to select features. With the pointer tool selected, click on the feature you want to select. That feature will be highlighted in the color indicated in the Properties dialog. If the Attribute Table is open, selected items will also be highlighted in the CellArray. To add to your selection, shift-click on another feature. To deselect all items, click outside of the selection. If editing has been enabled the selected features may be transformed by manipulating the rotbox.

Click to place a point feature in a vector layer. Editing must be enabled before placing the point.

Click to place a tic mark in a coverage.

33

Vector Tools (Large Format)

Click to draw new lines in a vector layer. Click to place points along the line where it changes direction. Double-click or middle-click (depending upon how your Preferences are set) to terminate the line. If enabled, node and arc snapping will be performed on the end points of the new line. Editing must be enabled before new lines can be drawn.

Click to split a line into two lines. Click at the point where you want to split the line. The row for the original line is removed from the attribute table and two new rows are added to the end of the attribute table.

Click to replace a portion of a line. The portion of the existing line above the acute angle is removed, as in the example below.

Editing must be enabled before you can use this option.

Click to create a simple polygon in a vector layer. Editing must be enabled before you can use this option.

Click to use the region growing tool to create a polygon. The polygon “growth” is based on parameters set in the Region Growing Properties dialog

34

Vector Tools (Large Format)

Click to select multiple features within a rectangular area. The actual features that are selected depend on the Select By options that are set in the Options dialog. If Intersect is selected, then all features that are contained in or intersect the marquee outline are selected. If Contained In is selected, then only those features that are entirely within the boundaries of the marquee outline are selected.

Click to select multiple features within an elliptical area. The actual features that are selected depend on the Select By options that are set in the Options dialog. If Intersect is selected, then all features that are contained in or intersect the marquee outline are selected. If Contained In is selected, then only those features that are entirely within the boundaries of the marquee outline are selected.

Click to select multiple features within a polygonal area. The actual features that are selected depend on the Select By options that are set in the Options dialog. If Intersect is selected, then all features that are contained in or intersect the marquee outline are selected. If Contained In is selected, then only those features that are entirely within the boundaries of the marquee outline are selected.

Click to select line features that intersect the line that you draw.

Keep Tool Click to retain the current tool until another is selected. Close Click to close this dialog. Help Click to see this On-Line Help document.

35

Vector Tools (Large Format)

➲ For information on using the ERDAS IMAGINE graphical interface, see the on-line IMAGINE Interface manual.

➲ For step-by-step instructions on using the IMAGINE Vector module, see the ERDAS IMAGINE Tour Guides manual.

36

Vector Tools and Commands

Vector Tools and Commands This tool palette enables you to select vector features in a variety of ways and to edit features. The Options dialog allows you to set parameters that affect the operation of some of these tools. This tool palette is opened when you select Vector | Tools... from the Viewer menu bar or when you click the

icon on the Viewer tool bar when a vector layer is the top layer in the viewer.

To enter specific position and size parameters, you can press the space bar while drawing many vector objects and a dialog is opened allowing you to enter precise coordinates and size information.

i

The Preference Editor allows you to select large or small tools. This tool palette is opened if you have selected small tools.

Click to select features. With the pointer tool selected, click on the feature you want to select. That feature will be highlighted in the color indicated in the Properties dialog. If the Attribute Table is open, selected items will also be highlighted in the CellArray. To add to your selection, shift-click on another feature. To deselect all items, click outside of the selection. If editing has been enabled the selected features may be transformed by manipulating the rotbox.

Click to place a point feature in a vector layer. Editing must be enabled before placing the point.

Click to place a tic mark in a coverage.

Click to draw new lines in a vector layer. Click to place points along the line where it changes direction. Double-click or middle-click (depending upon how your Preferences are set) to terminate the line. If enabled, node and arc snapping will be performed on the end points of the new line. Editing must be enabled before new lines can be drawn.

37

Vector Tools and Commands

Click to split a line into two lines. Click at the point where you want to split the line. The row for the original line is removed from the attribute table and two new rows are added to the end of the attribute table.

Click to replace a portion of a line. The portion of the existing line above the acute angle is removed, as in the example below.

Editing must be enabled before you can use this option.

Click to create a simple polygon in a vector layer. Editing must be enabled before you can use this option.

Click to use the region growing tool to create a polygon. The polygon “growth” is based on parameters set in the Region Growing Properties dialog.

Click to select multiple features within a rectangular area. The actual features that are selected depend on the Select By options that are set in the Options dialog. If Intersect is selected, then all features that are contained in or intersect the marquee outline are selected. If Contained In is selected, then only those features that are entirely within the boundaries of the marquee outline are selected.

Click to select multiple features within an elliptical area. The actual features that are selected depend on the Select By options that are set in the Options dialog.

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Vector Tools and Commands If Intersect is selected, then all features that are contained in or intersect the marquee outline are selected. If Contained In is selected, then only those features that are entirely within the boundaries of the marquee outline are selected.

Click to select multiple features within a polygonal area. The actual features that are selected depend on the Select By options that are set in the Options dialog. If Intersect is selected, then all features that are contained in or intersect the marquee outline are selected. If Contained In is selected, then only those features that are entirely within the boundaries of the marquee outline are selected.

Click to select line features that intersect the line that you draw.

Click to undo the last edit or all edits performed since the layer was saved. Simply click Undo as many times as needed to undo any number of edits.

Click to cut the selected elements from the coverage and save them to the paste buffer. These items can be restored using the Paste command or the Undo button.

Click to copy the selected features to the paste buffer.

Click to paste the items stored in the paste buffer. (Write items to the paste buffer using either the Cut or Copy commands.) Items are pasted in the same location as the items in the buffer. Therefore if you select a line, copy it, then paste it into the same layer, it will be placed exactly on top of the original line. You must move it if that is not where you want it. This makes it very easy to select a group of features in one coverage and use that same group in another layer and maintain the same level of accuracy. For example, you may want to use county boundaries from one layer in a related layer.

39

Vector Tools and Commands

Click to delete the selected items from the layer. Deleted items are not stored in the paste buffer and can only be restored using the Undo command.

Click to change the shape of a single line element by moving, adding, or deleting vertices.

♦ left-hold to move a vertex; ♦ middle-click to add a vertex; ♦ shift-middle-click to add or remove a vertex; ♦ left-hold on any side of a polygon or segment of a polyline to move it without rotating. To quit reshape mode, Click outside the element or select another element.

Click to smooth the selected arcs according to the grain tolerance that is stored with the coverage, or that you specify in the Options dialog. Vertices are added to the line according to the grain tolerance specified. The shape of the lines will change when Spline is used.

Click to add points to the selected lines according to the grain tolerance specified for that coverage, or the grain tolerance that you enter in the Options dialog. Densify does not change the shape of the lines.

Click to eliminate unnecessary vertices in a line according to the weed tolerance stored with the layer or that you enter in the Options dialog. Performing Generalize may speed further processing since the number of vertices in the layer may be greatly reduced.

Click to combine two arcs that share a node, if they are the only two lines sharing that node. The combined lines cannot have more than 500 points.

Click to create a multi-part feature by grouping selected features.

40

Vector Tools and Commands

Click to break up a selected multi-part feature into its parts.

Click to open the Vector Attribute Table dialog.

Click to open the Vector Properties dialog.

Click open the Vector Symbology dialog.

Click open the Vector Options dialog.

Click to open the Region Growing Properties dialog.

Click to add the currently selected annotation or AOI to the top Vector layer in the current viewer.

Click to create a new digitizing tablet configuration. The Tablet Setup dialog is opened.

Click to use an existing tablet configuration. The Tablet Status dialog is opened.

When this icon is displayed, the selected tool remains active (locked) until you select another tool.

When this icon is displayed, the selected tool is active for one use only. The pointer tool automatically becomes active following the single use of the currently selected tool.

Close Click to close this dialog. Click to see this On-Line Help document.

➲ For information on using the ERDAS IMAGINE graphical interface, see the on-line IMAGINE Interface manual.

41

Vector Tools and Commands

➲ For step-by-step instructions on using the IMAGINE Vector module, see the ERDAS IMAGINE Tour Guides manual.

42

Vector Tools and Commands (Large Format)

Vector Tools and Commands (Large Format) This tool palette enables you to select vector features in a variety of ways and to edit features. The Options dialog allows you to set parameters that affect the operation of some of these tools. This tool palette is opened when you select Vector | Tools... from the Viewer menu bar or when you click the

icon on the Viewer tool bar when a vector layer is the top layer in the viewer.

To enter specific position and size parameters, you can press the space bar while drawing many vector objects and a dialog is opened allowing you to enter precise coordinates and size information.

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The Preference Editor allows you to select large or small tools. This tool palette is opened if you have selected large tools.

Click to select features. With the pointer tool selected, click on the feature you want to select. That feature will be highlighted in the color indicated in the Properties dialog. If the Attribute Table is open, selected items will also be highlighted in the CellArray. To add to your selection, shift-click on another feature. To deselect all items, click outside of the selection. If editing has been enabled the selected features may be transformed by manipulating the rotbox.

Click to place a point feature in a vector layer. Editing must be enabled before placing the point.

Click to place a tic mark in a coverage.

43

Vector Tools and Commands (Large Format)

Click to draw new lines in a vector layer. Click to place points along the line where it changes direction. Double-click or middle-click (depending upon how your Preferences are set) to terminate the line. If enabled, node and arc snapping will be performed on the end points of the new line. Editing must be enabled before new lines can be drawn.

Click to split a line into two lines. Click at the point where you want to split the line. The row for the original line is removed from the attribute table and two new rows are added to the end of the attribute table.

Click to replace a portion of a line. The portion of the existing line above the acute angle is removed, as in the example below.

Editing must be enabled before you can use this option.

Click to create a simple polygon in a vector layer. Editing must be enabled before you can use this option.

Click to use the region growing tool to create a polygon. The polygon “growth” is based on parameters set in the Region Growing Properties dialog

44

Vector Tools and Commands (Large Format)

Click to select multiple features within a rectangular area. The actual features that are selected depend on the Select By options that are set in the Options dialog. If Intersect is selected, then all features that are contained in or intersect the marquee outline are selected. If Contained In is selected, then only those features that are entirely within the boundaries of the marquee outline are selected.

Click to select multiple features within an elliptical area. The actual features that are selected depend on the Select By options that are set in the Options dialog. If Intersect is selected, then all features that are contained in or intersect the marquee outline are selected. If Contained In is selected, then only those features that are entirely within the boundaries of the marquee outline are selected.

Click to select multiple features within a polygonal area. The actual features that are selected depend on the Select By options that are set in the Options dialog. If Intersect is selected, then all features that are contained in or intersect the marquee outline are selected. If Contained In is selected, then only those features that are entirely within the boundaries of the marquee outline are selected.

Click to select line features that intersect the line that you draw.

Click to undo the last edit or all edits performed since the layer was saved. Simply click Undo as many times as needed to undo any number of edits.

45

Vector Tools and Commands (Large Format)

Click to cut the selected elements from the coverage and save them to the paste buffer. These items can be restored using the Paste command or the Undo button.

Click to copy the selected features to the paste buffer.

Click to paste the items stored in the paste buffer. (Write items to the paste buffer using either the Cut or Copy commands.) Items are pasted in the same location as the items in the buffer. Therefore if you select a line, copy it, then paste it into the same layer, it will be placed exactly on top of the original line. You must move it if that is not where you want it. This makes it very easy to select a group of features in one coverage and use that same group in another layer and maintain the same level of accuracy. For example, you may want to use county boundaries from one layer in a related layer.

Click to delete the selected items from the layer. Deleted items are not stored in the paste buffer and can only be restored using the Undo command.

Click to change the shape of a single line element by moving, adding, or deleting vertices.

♦ left-hold to move a vertex; ♦ middle-click to add a vertex; ♦ shift-middle-click to add or remove a vertex; ♦ left-hold on any side of a polygon or segment of a polyline to move it without rotating. To quit reshape mode, Click outside the element or select another element.

46

Vector Tools and Commands (Large Format)

Click to smooth the selected arcs according to the grain tolerance that is stored with the coverage, or that you specify in the Options dialog. Vertices are added to the line according to the grain tolerance specified. The shape of the lines will change when Spline is used.

Click to add points to the selected lines according to the grain tolerance specified for that coverage, or the grain tolerance that you enter in the Options dialog.

Click to eliminate unnecessary vertices in a line according to the weed tolerance stored with the layer or that you enter in the Options dialog. Performing Generalize may speed further processing since the number of vertices in the layer may be greatly reduced.

Click to combine two arcs that share a node, if they are the only two lines sharing that node. The combined lines cannot have more than 500 points.

Click to create a multi-part feature by grouping selected features.

Click to break up a selected multi-part feature into its parts.

Click to open the Vector Attribute Table dialog.

Click to open the Vector Properties dialog.

47

Vector Tools and Commands (Large Format)

Click open the Vector Symbology dialog.

Click open the Vector Options dialog.

Click to open the Region Growing Properties dialog.

Click to add the currently selected annotation or AOI to the top Vector layer in the current viewer.

Click to create a new digitizing tablet configuration. The Tablet Setup dialog is opened.

Click to use an existing tablet configuration. The Tablet Status dialog is opened.

When this icon is displayed, the selected tool remains active (locked) until you select another tool.

When this icon is displayed, the selected tool is active for one use only. The pointer tool automatically becomes active following the single use of the currently selected tool.

Close Click to close this dialog. Click to see this On-Line Help document.

➲ For information on using the ERDAS IMAGINE graphical interface, see the on-line IMAGINE Interface manual.

48

Vector Tools and Commands (Large Format)

➲ For step-by-step instructions on using the IMAGINE Vector module, see the ERDAS IMAGINE Tour Guides manual.

49

Vector Commands

Vector Commands Use these vector commands to perform many editing operations on a vector layer. These commands are often used in conjunction with the vector Tools and Options. Most of these operations work on all selected elements. Elements can be selected graphically in the Viewer or from the attribute CellArray. This dialog cannot be reached using the IMAGINE user interface. It can only be accessed through EML application functions commands. These commands are also found in the Vector menu on the Viewer, and in the Vector Tools and Commands palette.

☞ You must left-hold Vector/Enable Editing from the Viewer menu bar before you can use these commands.

☞ You can also open these commands as icons in the vector tool palette. This option is set in the viewer category of the Preference Editor.

Undo Left-click to undo the last edit or all edits performed since the layer was saved. Simply left-click Undo as many times as needed to undo any number of edits.

Cut Left-click to cut the selected elements from the coverage and save them to the paste buffer. These items can be restored using the Paste command or the Undo button.

Copy Left-click to copy the selected features to the paste buffer. Paste Left-click to paste the items stored in the paste buffer. (Write items to the paste buffer using either the Cut or Copy commands.) Items are pasted in the same location as the items in the buffer. Therefore if you select a line, copy it, then paste it into the same layer, it will be placed exactly on top of the original line. You must move it if that is not where you want it. This makes it very easy to select a group of features in one coverage and use that same group in another layer and maintain the same level of accuracy. For example, you may want to use county boundaries from one layer in a related layer.

Delete Left-click to delete the selected items from the layer. Deleted items are not stored in the paste buffer and can only be restored using the Undo command. Reshape Left-click to change the shape of a single element.

50

Vector Commands

Spline Left-click to smooth the selected arcs according to the grain tolerance that is stored with the coverage, or that you specify in the Options dialog. Vertices are added to the line according to the grain tolerance specified. The shape of the lines will change when Spline is used.

Densify Left-click to add points to the selected lines according to the grain tolerance specified for that coverage, or the grain tolerance that you enter in the Options dialog. Densify does not change the shape of the lines.

Generalize Left-click to eliminate unnecessary vertices in a line according to the weed tolerance stored with the layer or that you enter in the Options dialog. Performing Generalize may speed further processing since the number of vertices in the layer may be greatly reduced.

Join Left-click to combine two arcs that share a node, if they are the only two lines sharing that node. The combined lines cannot have more than 500 points.

Group

Create a multi-part feature by grouping selected features.

Ungroup

Break up a selected multi-part feature into its parts.

Close Left-click to close this dialog. Help Left-click to see this On-Line Help document. ➲ For information on using the ERDAS IMAGINE graphical interface, see the on-line IMAGINE Interface manual.

➲ For step-by-step instructions on using the IMAGINE Vector module, see the ERDAS IMAGINE Tour Guides manual.

51

Vector Attribute Table

Vector Attribute Table This CellArray displays the attributes for the vector features displayed in the Viewer. It also allows you to select features by attribute and to edit attribute values, and it provides many of the CellArray editing features found throughout ERDAS IMAGINE.

☞ You must select Vector | Enable Editing from the Viewer menu bar before you can edit your attributes. This Attribute Table appears when you select Vector | Attributes from the Viewer menu bar and when you right-hold Vector Options | Show Attributes in the Arrange Layers dialog. If lines are displayed in the Viewer, then the CellArray will contain line attribute information. If points are displayed, then the CellArray will display point attribute information, etc. The title bar of this dialog reflects the name of the vector layer you are editing.

☞ Selecting and deselecting from the CellArray affects only those features that are displayed in the CellArray. To deselect features of all types, select View | Deselect All Features in the Vector Attribute Table menu bar.

File This menu option allows you to close the current attribute table. Close

Select this option to close this attribute table.

Edit This menu provides many options for editing the attribute information. Some of these items will be disabled if you have not enabled editing.

☞ Editing functions may be performed only when the Vector module is installed. Column Attributes... Select this option to change the title, data type, precision, etc., of columns in the attribute table and to add new attribute columns. The Column Attributes dialog is opened. This will be enabled only if you have attributes for this feature type. Create Attributes Select this option to create attributes for a coverage that does not already have attribute information. The default columns for the type of feature for which you are creating attributes are created. This will be enabled only if you have enabled editing and you do not yet have any attributes for this feature type. This operation CANNOT be undone (with the Undo command), but you CAN exit without saving your changes. Merge Attributes... Select this option to merge attribute information from another file. The Merge Attributes dialog is opened. This menu item will be enabled only when editing is enabled, no unsaved edits have been made, and you have at least the automaticallygenerated attributes for this feature type.

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Vector Attribute Table Export Attributes... Select this option to export a column of attributes to another file. The Export Attributes dialog is opened. This menu item will be enabled only if you have attributes (rows and columns) for this feature type. Copy Select this option to copy the selected rows of the selected columns. Items are written to the paste buffer. Paste Select this option to paste the contents of the paste buffer. This menu item will be enabled only when editing is enabled. Select All Columns Select this option to select all columns in the CellArray. All columns will be highlighted in cyan. Deselect All Columns

Select this option to deselect any selected columns.

Select All Rows Select this option to select all rows in the Attribute Table. All rows will be highlighted in yellow. If all columns are also selected, then all cells in the table will be highlighted in green. Deselect All Rows

Select this option to deselect all currently selected rows.

Select Rows by Criteria... Select this option to select rows by entering specific selection criteria. The Selection Criteria dialog is opened.

View Use the View menu to change the type of attributes that are displayed in the attribute table. Point Attributes

Select this option to view point attributes.

Lines Attributes

Select this option to view line attributes.

Polygon Attributes Tic Attributes

Select this option to view polygon attributes.

Select this option to view tic attributes.

Display Only Selected This item affects what is displayed in the Viewer. Select this option to display attributes on only selected features. Selected features are highlighted. All features are always displayed in the CellArray. Deselect All Features

Select this option to deselect all features of all feature types.

Help Help for Vector Attributes

Select this option to see this On-Line Help document.

Click to copy the currently selected columns to the paste buffer.

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Vector Attribute Table

Click to paste the contents of the paste buffer into the selected columns.

(Attribute CellArray) The feature attributes are displayed in this CellArray. Right-hold with your cursor in the Record column to access the Row Selection menu. Right hold with your cursor in any column title cell to access the Column Options menu. Within the attribute table you can use any of the CellArray tools that are discussed in the online IMAGINE Interface manual.

➲ For information on using the ERDAS IMAGINE graphical interface, see the on-line IMAGINE Interface manual.

➲ For step-by-step instructions on using the IMAGINE Vector module, see the ERDAS IMAGINE Tour Guides manual.

54

Column Attributes

Column Attributes This dialog allows you to define the characteristics of attribute columns in the attribute table. You can also add new columns to the table. You cannot change the characteristics of columns once they have been added to the table (after you Click OK). This dialog is opened when you select Edit | Column Attributes... in the menu bar of the Vector Attribute Table dialog.

☞ Editing functions may be performed only when the Vector module is installed. Columns: The current columns in the attribute table are listed. Most of the other options in this dialog are disabled until you select New to add a new column to the table. Only the characteristics of columns that are being added can be modified. The characteristics of existing columns (columns that were there when this operation was begun) cannot be changed.

Title Enter the name of the new column you are creating. Type Click the popup list button to select the type of data in this column. String

The column will contain string data.

Integer

The column will contain integer data.

Real

The column will contain real data.

Date

The column will contain data in date form.

Max Width For string data, enter the maximum width of the column. Precision Click the popup list button to select the precision of the data in the column. This option is disabled for string and date data. Single Double

The data will be in single precision. The data will be in double precision.

Decimal Places For real numbers, enter the number of decimal places of the selected column.

Display Width Enter the display width of the selected column.

55

Column Attributes

New Click to add a new column. The characteristics of the selected column are used for the defaults for this column, except for the name, which is generated. This button will be enabled only when editing is enabled. New columns will be placed at the end of normal columns and before redefined columns.

Delete Click to delete the selected column. Automatically-generated columns cannot be deleted. This button will be enabled only when editing is enabled and no unsaved changes have been made.

OK Click to accept the columns shown and close this dialog. This operation CANNOT be undone (with the Undo command). Deleted columns are deleted from your layer immediately (even if you do not save your changes), but added columns do not get permanently added until you save your changes.

Cancel Click to cancel any changes to the columns and close this dialog. Help Click to see this On-Line Help document. ➲ For information on using the ERDAS IMAGINE graphical interface, see the on-line IMAGINE Interface manual.

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Merge Attributes

Merge Attributes This dialog allows you to merge attributes from another INFO file into the current attribute table. This dialog is opened when you select Edit | Merge Attributes... from the menu bar of the Vector Attribute Table dialog.

File to Merge Enter the name of the INFO file to merge into the current file. You must specify the complete path of the file as in the example below: /georgia/info!arc! where /georgia/ is the name of the workspace. The name will resemble one of the following sample file names: parcels.acode parcels.pcode parcels.xcode

Relate Type CLick the popup list button to select how the merge file records will be matched to the current attribute data. Ordered

The related file is sorted by the relate column. A binary search is used.

Linear Both tables can be sorted in any order. This option is generally the slowest of the three options. Link Both tables can be sorted in any order. The value for the current attribute item indicates the record number of the related file. This is the fasted of the three methods.

Relate Column: Indicate which column in the current attribute table will be used as the relate column.

Place After: Indicate where in the attribute table to place the new column. OK Click to merge columns in the specified file to the current attribute file. This operation CANNOT be undone (with the Undo command) and it affects your layer immediately (even if you do not save your changes).

Cancel Click to cancel the merge and close this dialog. Help Click to see this On-Line Help document. ➲ For information on using the ERDAS IMAGINE graphical interface, see the on-line IMAGINE Interface manual.

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Export Attributes

Export Attributes This dialog enables you to export the attribute information from one, some, or all columns of the current attribute table to a new INFO file. This dialog is opened when you select Edit | Export Attributes... from the menu bar of the Vector Attribute Table dialog.

Output Filename Enter the name of the INFO file to which you want to write the selected attributes. You must specify the complete path of the file as in the example below: /georgia/info!arc! Where georgia is the workspace name and will resemble one of the following sample file names: parcels.acode parcels.pcode parcels.xcode

(CellArray) Select columns to export by selecting rows in the CellArray. OK Click to export the selected attributes to the file named above. Cancel Click to close this dialog without exporting attributes. Help Click to see this On-Line Help document. ➲ For information on using the ERDAS IMAGINE graphical interface, see the on-line IMAGINE Interface manual.

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Properties

Properties This dialog allows you to set the properties that determine how vector data are displayed. This information can be read from a symbology file, edited, and saved to a new or existing symbology file. This dialog also determines which features of a particular layer are currently opened and opens the default styles used (the style used if there is no attribute-based symbology for this feature type or if the feature does not fall into any of the specified classes) for the feature types.

☞ You must Click Apply before new styles are applied to the displayed vector layer. This dialog is opened when you select Vector | Viewing Properties... from the Viewer menu bar and when you select Vector Options | Show Properties in the Arrange Layers dialog.

Arcs Click to display lines. The default line style is shown as well as the number of lines in the displayed layer (in parentheses). Click the style chooser button to change the line style.

Points Click to display points. The default point symbol is shown as well as the number of points in the displayed layer (in parentheses). Click the style chooser button to change the symbol style.

Attribute Click to display attribute information at the points. Click the popup list button to select the attribute information to display. Click the style chooser button to change the text style.

Polygon Click to display polygons. The default polygon style is shown as well as the number of polygons in the displayed layer (in parentheses). Click the style chooser button to change the fill style.

☞ You can display polygons only if you are not editing your layer. If editing is enabled, this check box is disabled. All Click to display all polygons in the layer. Click the style chooser button to change the fill style. Errors

Click to display only polygons with errors.

When this option is enabled, you will not be able to select polygons that do not contain errors. No Labels Click to display polygons that do not have labels. Click the style chooser button to change the fill style. Multiple Labels Click to display polygons that have multiple labels. Click the style chooser button to change the fill style.

59

Properties

Tics Click to display tics. The default point symbol is shown as well as the number of tics in the displayed layer (in parentheses). Click the style chooser button to change the symbol style.

Nodes Click to display nodes. All

Click to display all nodes. Click the style chooser button to change the fill style.

Errors Click to display only erroneous nodes. You can display errors only if editing is enabled; otherwise, the All and Errors radio buttons are disabled. Dangling Click to display dangling nodes. Click the style chooser button to change the symbol style. Pseudo Click to display pseudo nodes. Click the style chooser button to change the symbol style.

Bounding Box Click to display the bounding box. Click the style chooser button to change the line style.

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If several vector layers are displayed, the Viewer will fill in white behind only the bounding box of each layer, not the bounding box of all layers.

Selection Color: Click the style chooser button to choose the highlight color for selected features. The default color is yellow.

Display the Selected Subset Only Click here to confine queries and display within a selected subset.

Attribute-based symbology Click to toggle the use of attribute-based symbology. Symbology: The file storing the symbology being used to view this layer is reported. If the layer does not have an associate symbology file, this will say <none>. Set ... Click to select a different symbology file. The Select Vector Symbology dialog is opened.

Apply Click to apply this symbology to the displayed layer. Save Click to save the applied symbology to the file named above. Save As ... Click to save the applied symbology to a new file. The Save Symbology As ... dialog is opened.

Close Click to close this dialog. 60

Properties

Help Click to see this On-Line Help document. ➲ For information on using the ERDAS IMAGINE graphical interface, see the on-line IMAGINE Interface manual.

➲ For more information on ERDAS IMAGINE vector layers, see the “Vector Layers” chapter in the ERDAS Field Guide.

➲ For step-by-step instructions on using the IMAGINE Vector module, see the ERDAS IMAGINE Tour Guides manual.

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Select Vector Symbology

Select Vector Symbology This dialog enables you to select a symbology file to use. This dialog is opened when you click the Set... button in the Properties dialog. The symbology from the file selected will be displayed in the Properties dialog. You must click Apply to apply this symbology to the layer.

Symbology: Use this file name part to select the symbology file to use. OK Click to use the selected symbology file and close this dialog. Cancel Click to cancel this process and close this dialog. Help Click to see this On-Line Help document. ➲ For information on using the ERDAS IMAGINE graphical interface, see the on-line IMAGINE Interface manual.

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Save Symbology As ...

Save Symbology As ... This dialog enables you to save the properties that you have set in a new symbology file. This dialog is opened when you click the Save As... button in the Properties dialog. This same dialog opens when you select File | Save As... in the Symbology dialog.

Save Symbology: Reports the name of the current symbology file. as: Enter the name for the new symbology file using the file name part. OK Click to save the symbology file and close this dialog. Cancel Click to cancel this process and close this dialog. Help Click to see this On-Line Help document. ➲ For information on using the ERDAS IMAGINE graphical interface, see the on-line IMAGINE Interface manual.

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Symbology

Symbology This dialog allows you to select the symbology used to display vector features. This dialog is opened when you select Vector | Symbology... from the Viewer menu bar and when you select Vector Options | Show Symbology in the Arrange Layers dialog.

File This menu provides options for saving and closing the symbology table. Save

Select this option to save the current symbology in an existing file.

Save As ... Select This Option to save the current symbology in a new file. The Save Symbology As... dialog is opened. Close

Select this option to close this symbology table.

Edit This menu provides options for editing the symbology. Apply Select this option to redisplay the vector layer in the Viewer using the new symbology. Set Number of Classes... Select this option to set the number of classes to symbolize. The Number of Symbology Classes dialog is opened. Set Evaluation Precision... Select this option to set the evaluation precision to use. The Equation Evaluation Precision dialog is opened. Copy

Select this option to copy the current selection to the paste buffer.

Paste

Select this option to paste the contents of the paste buffer.

Select All Columns highlighted in cyan.

Select this option to select all columns. The columns will be

Deselect All Columns

Select this option to deselect all currently selected columns.

Select All Rows Select this option to select all rows. The rows will be highlighted in yellow. If all columns are also selected, then all cells of the table will be highlighted in green. Deselect All Rows

Select this option to deselect all currently selected rows.

Select Rows by Criteria... Select this option to select rows according to specific criteria parameters. The Selection Criteria dialog is opened.

View This menu provides options for selecting the type of symbology to view in the table. Point Symbology

Click this radio button to view point symbology.

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Symbology Attribute Symbology Line Symbology

Click this radio button to view attribute symbology.

Click this radio button to view line symbology.

Polygon Symbology

Click this radio button to view polygon symbology.

Automatic This menu provides options for automatically generating symbology classes. Equal Divisions... Select this option to divide a range of values into an equal number of classes. The Equal Divisions dialog is opened. Equal Counts... Select this option to put an equal number of features in a specified number of classes. The Equal Counts dialog is opened. Unique Value... Select this option to generate a separate class for each unique value. The Unique Value dialog is opened.

Help Help for Vector Symbology Select this option to see this On-Line Help document.

Click to copy the currently selected columns to the paste buffer.

Click to paste the contents into the selected columns.

(Symbology CellArray) The symbology classes are displayed in this CellArray. Righthold with your cursor in the Record column to access the Row Selection menu. Right hold with your cursor in any column title cell to access the Column Options menu. All expressions and styles within the Symbology CellArray are editable by clicking inside the CellArray to bring up the Edit Expression or Fill Style Chooser dialog. Within the symbology table you can use any of the CellArray tools that are discussed in the on-line IMAGINE Interface manual.

Apply Click to apply this symbology to the displayed layer. Close Click to close this dialog. Help Click to see this On-Line Help document. ➲ For information on using the ERDAS IMAGINE graphical interface, see the on-line IMAGINE Interface manual.

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Symbology

➲ For more information on vector layers, see the “Vector Layers” chapter in the ERDAS Field Guide.

➲ For step-by-step instructions on using the IMAGINE Vector module, see the ERDAS IMAGINE Tour Guides manual.

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Edit Expression

Edit Expression This dialog enables you to edit the expression that determines which features belong to the current symbology class (noted by the > column in the CellArray). This expression editor is similar to the Selection Criteria editor in CellArrays and the Function Definition dialog in Model Maker. You simply click on the attributes, operators, comparison functions, and the number pad to create an expression that defines the features to be contained in a particular class. When you click on an item in the Attributes, Operators, Compares, or Number Pad, that item is automatically placed in the Expression box at the bottom of the dialog. This dialog is opened when you click inside the CellArray of the Symbology dialog.

Attributes: The attribute columns for the current Symbology table are listed. Operators: Use these operators to combine values from various columns into new values. Most of these operators work on numerical values only. However, the addition function (+) may be used to concatenate two strings. +

Addition

-

Subtraction

*

Multiplication

/

Division

mod( , ) abs( ) int( )

Modulus — the remainder when is divided by .

Absolute Value of . Integer — the greatest integer less than or equal to .

even( ) Selects all entries with even values in the column . If the modulus of the number and two is zero, then it is considered even. This function should really be applied only to whole numbers. odd( ) Selects all entries with odd values in the column . This is defined as the inverse of even(). This function should really be applied only to whole numbers. max( , )

This function returns the maximum of the two arguments.

min( , )

This function returns the minimum of the two arguments.

row() This function returns the current row number, starting with zero (0) for the first row. This function takes no arguments. sin( )

Returns the sine of the argument. The argument is interpreted as degrees.

67

Edit Expression cos( ) Returns the cosine of the argument. The argument is interpreted as degrees. tan( ) Returns the tangent of the argument. The argument is interpreted as degrees. asin( )

Returns the arcsine of the argument. The result is in degrees.

acos( )

Returns the arccosine of the argument. The result is in degrees.

atan( )

Returns the arctangent of the argument. The result is in degrees.

ln( ) log( ) sqrt( )

Returns the natural logarithm of the argument. Returns the common logarithm of the argument. Returns the square root of the argument.

convert( , , ) format( )

This is a unit conversion function.

This is a number-to-string conversion function.

format( , )

This is a number-to-string conversion function.

between and This function returns “true” (non-zero) for all entries >= the low value and <= the high value.

Compares: Use these comparison operators to create logical expressions (“true” or “false” statements) by comparing values. Most of the comparisons apply only to numeric values, though == (equals) and != (not equals) may be used with numbers and strings. In addition, the comparison “contains” is valid only for strings. >

Is greater than

<

Is less than

==

Is equal to

<=

Is less than or equal to

>=

Is greater than or equal to

!=

Is not equal to

contains This function checks to see if the right-hand value is a string which is contained in the left-hand value.

and Use and to combine two logical expressions. Both expressions must be true for the whole resulting expression to be true.

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Edit Expression

or Use or to combine two logical expressions. Either expression can be true to make the entire resulting expression true.

not Use not to negate any logical expression. ( ) Use the parentheses with some of the Operators, as shown in the syntax examples above, or to group logical expressions to show precedence.

(Numeric Keypad) The number pad works like a calculator, to let you enter numerical values into the query. The - and . keys are for negative and decimal, respectively.

Expression: The expression is built in this expression definition box. Items that you select in the above categories are automatically placed at the cursor position in this expression definition box. You can also directly enter text in this box, delete items, edit, etc.

OK Click to apply this expression to the current class in the Symbology dialog and close this dialog.

Cancel Click to close this dialog without applying the expression. Clear Click to clear the Expression definition box. Help Click to see this On-Line Help document. ➲ For information on using the ERDAS IMAGINE graphical interface, see the on-line IMAGINE Interface manual.

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Number of Symbology Classes

Number of Symbology Classes This dialog enables you to enter the number of symbology classes you want for the feature type. It opens when you select Edit | Set Number of Classes... from the menu bar of the Symbology dialog.

Number of Classes: Select the number of classes for the symbology. Generate New Styles Click to generate new styles for the classes. New styles are based on the default style for this feature type. The color is generated by doing a level slice from red to violet for the number of classes requested. Depending on the current state of the Symbology table, the following can be expected: If classes do not already exist in the Symbology table and this option is selected, then the specified number of classes will be created and each will have different symbology. If classes do not already exist in the Symbology table and this option is not selected, then the specified number of classes will be created, but each will have the same symbology (the default symbology for this feature type). If classes already exist and this option is selected, the new styles will overwrite the existing styles. If classes already exist and this option is not selected, new styles will not be generated for any new classes that are created, and any more classes that were generated for which there was not already a symbology will have the default symbology for this feature type.

OK Click to set number of symbology classes and close this dialog. Cancel Click to cancel setting the number of symbology classes and close this dialog. Help Click to see this On-Line Help document. ➲ For information on using the ERDAS IMAGINE graphical interface, see the on-line IMAGINE Interface manual.

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Equation Evaluation Precision

Equation Evaluation Precision This dialog enables you to enter the evaluation precision that will be used in the equations used to create symbology classes. This dialog is opened when you select Edit | Set Evaluation Precision... from the menu bar of the Symbology dialog.

Precision: Set the number of decimal places to be matched when doing floating-point comparisons (-1 means all).

OK Click to set the new evaluation precision and close this dialog. Cancel Click to cancel setting the evaluation precision and close this dialog. Help Click to see this On-Line Help document. ➲ For information on using the ERDAS IMAGINE graphical interface, see the on-line IMAGINE Interface manual.

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Equal Divisions

Equal Divisions This dialog enables you to quickly generate attribute-based symbology by dividing the range of values in an attribute column into a specified number of classes. Attributes with the same value are never split between classes. Expressions, names, and (if requested) styles are generated for each class. The expressions, names, and symbology may then be edited, if desired. This dialog is opened when you select Automatic | Equal Divisions... from the menu bar of the Symbology dialog.

(Attribute Name) Click on this popup list to specify the attribute column from which you want to generate symbology classes.

Number of Classes: Enter the number of divisions you want to create for this range of attribute values.

Generate New Styles Click to generate new styles for the classes. New styles are based on the default style for this feature type. The color is generated by doing a level slice from red to violet for the number of classes requested. Depending on the current state of the Symbology table, the following can be expected: If classes do not already exist in the Symbology table and this option is selected, then the specified number of classes will be created and each will have different symbology. If classes do not already exist in the Symbology table and this option is not selected, then the specified number of classes will be created, but each will have the same symbology (the default symbology for this feature type). If classes already exist and this option is selected, the new styles will overwrite the existing styles. If classes already exist and this option is not selected, new styles will not be generated for any new classes that are created and any more classes that were generated for which there was not already a symbology will have the default symbology for this feature type.

OK Click to automatically generate symbology of equal division and close this dialog. Cancel Click to cancel generating automatic symbology and close this dialog. Help Click to see this On-Line Help document. ➲ For information on using the ERDAS IMAGINE graphical interface, see the on-line IMAGINE Interface manual.

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Equal Counts

Equal Counts This dialog enables you to quickly generate attribute-based symbology by putting an equal number of features in a user-defined number of classes based on the range of values in the selected attribute column. Attributes with the same value are never split between classes. Expressions, names, and (if requested) styles are generated for each class. The expressions, names, and symbology may then be edited if desired. This dialog is opened when you select Automatic | Equal Counts... from the menu bar of the Symbology dialog.

(Attribute Name) Click on this popup list to specify the attribute column from which you want to generate symbology classes.

Number of Classes: Enter the number of classes into which to divide the attribute values.

Generate New Styles Click to generate new styles for the classes. New styles are based on the default style for this feature type. The color is generated by doing a level slice from red to violet for the number of classes requested. Depending on the current state of the Symbology table, the following can be expected: If classes do not already exist in the Symbology table and this option is selected, then the specified number of classes will be created and each will have different symbology. If classes do not already exist in the Symbology table and this option is not selected, then the specified number of classes will be created, but each will have the same symbology (the default symbology for this feature type). If classes already exist and this option is selected, the new styles will overwrite the existing styles. If classes already exist and this option is not selected, new styles will not be generated for any new classes that are created and any more classes that were generated for which there was not already a symbology will have the default symbology for this feature type.

OK Click to automatically generate symbology of equal counts and close this dialog. Cancel Click to cancel generating automatic symbology and close this dialog. Help Click to see this On-Line Help document. ➲ For information on using the ERDAS IMAGINE graphical interface, see the on-line IMAGINE Interface manual.

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Unique Value

Unique Value This dialog enables you to quickly generate attribute-based symbology by creating a separate class for each unique value in the selected attribute column. Expressions, names, and (if requested) styles are generated for each class. The expressions, names, and symbology may then be edited, if desired. This dialog is opened when you select Automatic | Unique Value... from the menu bar of the Symbology dialog.

(Attribute Name) Click on this popup list to specify the attribute column from which you want to generate symbology classes.

Generate New Styles Click to generate new styles for the classes. New styles are based on the default style for this feature type. The color is generated by doing a level slice from red to violet for the number of classes requested. Depending on the current state of the Symbology table, the following can be expected: If classes do not already exist in the Symbology table and this option is selected, then the specified number of classes will be created and each will have different symbology. If classes do not already exist in the Symbology table and this option is not selected, then the specified number of classes will be created, but each will have the same symbology (the default symbology for this feature type). If classes already exist and this option is selected, the new styles will overwrite the existing styles. If classes already exist and this option is not selected, new styles will not be generated for any new classes that are created, and any more classes that were generated for which there was not already a symbology will have the default symbology for this feature type.

OK Click to automatically generate symbology of unique values and close this dialog. Cancel Click to cancel generating automatic symbology and close this dialog. Help Click to see this On-Line Help document. ➲ For information on using the ERDAS IMAGINE graphical interface, see the on-line IMAGINE Interface manual.

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Options

Options This dialog enables you to set parameters that affect vector selection and editing. This dialog is opened when you click the icon on the Vector Tools and Commands palette. It is also opened when you select Vector | Options... from the Viewer menu bar and when you right-hold Vector Options | Show Options... in the Arrange Layers dialog.

Node Snap Click to enable node snapping. When this option is enabled, new and edited lines that do not terminate at existing nodes will be automatically snapped to the nearest node, if there is a node within the set snap distance. Dist:

Enter the node snap distance.

Arc Snap Click to enable arc (line) snapping. When this option is enabled, new and edited lines that do not terminate at existing nodes will be automatically snapped to the nearest line if there is a line within the set snap distance. A node will be created at this new intersection. Dist:

Enter the arc snap distance.

Weed Click to enable weeding of new lines. If enabled, vertices must be at least the Weed Distance apart to be retained. Dist:

Enter the weed distance.

Grain tolerance: Specify the distance between adjacent vertices in lines. This parameter is used when lines are splined or densified.

Select By: Indicate how features will be selected when using the marquee tools in the Tools dialog. Intersect

Click to select all features that intersect the marquee.

Contained In the marquee.

Click to select only those features that are completely contained within

Apply Click to apply the selected options. Close Click to close this dialog. Help Click to see this On-Line Help document. ➲ For information on using the ERDAS IMAGINE graphical interface, see the on-line IMAGINE Interface manual.

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Options

➲ For step-by-step instructions on using the IMAGINE Vector module, see the ERDAS IMAGINE Tour Guides manual.

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Save Layer As ...

Save Layer As ... This dialog enables you to save the top layer displayed in a Viewer to a new file. It is opened when you select File | Save | Top Layer As... in the Viewer menu bar. This dialog is also opened when you select Save Layer As... from the right-button menu of a layer bar in the Arrange Layers dialog.

☞ In ERDAS IMAGINE filename parts, you can enter a wildcard with the following extensions to search for ARC/INFO data: *.arcinfo to search for ARC/INFO coverages (IMAGINE vector layers) *.grid to search for GRIDs *.stk to search for a stack of GRIDs *.vpf to search for VPF data *.wksp to search for workspaces These are not the actual file extensions used on these files. They are simply cues that tell IMAGINE the type of data for which you are searching.

Save as: Enter the name for the new vector layer. OK Click to save the vector layer and close this dialog. Cancel Click to cancel this process and close this dialog. Help Click to see this On-Line Help document. ➲ For information on using the ERDAS IMAGINE graphical interface, see the on-line IMAGINE Interface manual.

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Create New Table

Create New Table This dialog enables you to create a new INFO table. It opens when you select File | New... or Edit | Create New Table... from the Table Tool dialog.

☞ Create New Table is not available under Windows 95. Info Directory Path: Enter the path of the workspace where the new table is to be created.

New Table to Create: Specify the name of the new table to create or an existing table to overwrite.

Current Column List: The list of columns to be created with the new table. Add... Click to add a new column to the list. The New Column dialog opens. Delete Click to delete the selected column from the list. Edit... Click to edit the definition of the selected column. The Edit Column dialog opens. OK Click to confirm creating the new table as specified. Dismiss Click to dismiss (close) this dialog. Help Click to view the On-Line Help for this dialog.

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Edit Column

Edit Column This dialog enables you to change the definition of the selected column before it is created. It opens when you click the Edit... button on the Create New Table dialog.

☞ The Edit Column dialog is not available under Windows 95. Column Name: The name of the current column is displayed. After Column: Click on the popup list to select the column after which the current column is placed.

Column Type: Click on the popup list to select the column data type. Character String Short Integer Integer Double Float Single Float Date

Internal Width: Enter the number of bytes used internally to store the data. Display Width: Enter the display width of the column. Decimal Places: Enter the number of decimal places to display. OK Click to save the current column definition. Cancel Click to cancel this process and close this dialog. Help Click to view the On-Line Help for this dialog.

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Open Info Table

Open Info Table This dialog enables you to open an INFO table. This dialog opens when you select File | Open... from the Table Tool dialog.

☞ Open Info Table is not available under Windows 95. Enter the info directory path: Enter the full path of the INFO directory. Record#: The total number of records in the CellArray is listed. Item#: The number of items (fields or columns) in each record is listed. Reclen: The length in bytes of a record is listed. Tables are composed of fixed length records.

OK Click to open the selected table on the scroll list and dismiss this dialog. Browse Click (or double click on the table name) to browse the content of the selected table without dismissing this dialog.

Close Click to close the selected table and clear the CellArray. Copy... Click to copy the selected table. Rename... Click to rename the selected table. Delete... Click to remove the table permanently from the INFO directory. Merge... Click to merge the selected table with another table. Dismiss Click to dismiss (close) this dialog. Help Click to view the On-Line Help for this dialog.

80

Save Table As

Save Table As This dialog enables you to save the current table to a new name. It opens when you select File | Save As... from the Table Tool dialog.

☞ Save Table As is not available under Windows 95. Info Directory Path: Enter the name of the workspace where the table of relates is to be saved.

Table to Save to: Specify a new table to save to or an existing table to overwrite. OK Click to save to the table name specified. Dismiss Click to dismiss (close) this dialog. Help Click to view the On-Line help for this dialog.

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Add Rows

Add Rows This dialog enables you to add new rows (records) to the table being edited. It opens when you select Edit | Add Rows... from the Table Tool dialog or when you click the

icon.

☞ The Add Rows dialog is not available under Windows 95. Number of Rows to Add: Enter the number of rows to add to the bottom of the table. OK Click to add the row(s). Cancel Click to cancel this process and close this dialog.

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Add Column

Add Column This dialog enables you to define and add a new column to the table being edited. It opens when you select Edit | Add A Column... from the Table Tool dialog or when you click the

icon.

☞ The Add Column dialog is not available under Windows 95. Column Name: Enter the name of the new column to be added. After Column: Click on the popup list to select the column after which the new column is placed.

Column Type: Click on the popup list to select the column data type. Character String Short Integer Integer Double Float Single Float Date

Internal Width: Enter the number of bytes used internally to store the data. This option is applicable to character string data only. Display Width: Enter the display width of the column. Decimal Places: Enter the number of decimal places to display. OK Click to add the column. Cancel Click to cancel this process and close this dialog. Help Click to view the On-Line Help for this dialog.

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New Column

New Column This dialog enables you to define a new column and add it to the current list of columns to be created with the new table. It opens when you click the Add... button on the Create New Table dialog.

☞ The New Column dialog is not available under Windows 95. Column Name: Enter the name of the new column to be added. After Column: Click on the popup list to select the column after which the new column is placed.

Column Type: Click on the popup list to select the column data type. Character String Short Integer Integer Double Float Single Float Date

Internal Width: Enter the number of bytes used internally to store the data. This option is applicable to character string data only.

Display Width: Enter the display width of the column. Decimal Places: Enter the number of decimal places to display. OK Click to add the column. Cancel Click to cancel this process and close this dialog. Help Click to view the On-Line Help for this dialog.

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Copy Info Table

Copy Info Table This dialog enables you to copy an INFO table. This dialog opens when you select Utilities | Table Copy... from the Table Tool dialog.

☞ The Copy Info Table is not available under Windows 95. Source Info directory path: Enter the full path of the source INFO directory. Table to copy from: Click on the popup list to select the name of the INFO table to copy from.

Destination Info directory path: Enter the full path of the destination INFO directory. New table to copy to: Enter the name of the INFO table to copy to. OK Click to copy the INFO table. Cancel Click to cancel this process and close this dialog. Help Click to view the On-Line Help for this dialog.

85

Rename Info Table

Rename Info Table This dialog enables you to rename an INFO table. It opens when you select Utilities | Table Rename... from the Table Tool dialog.

☞ The Rename Info Table is not available under Windows 95. Source Info directory path: Enter the full path of the source INFO directory. Table to be renamed: Enter the name of a table to be renamed or click on the popup list to select a name.

New table name: Enter the name of the table to copy to. OK Click to rename the INFO table. Cancel Click to cancel the rename and close this dialog. Help Click to view the On-Line Help for this dialog.

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Delete Info Table

Delete Info Table This dialog enables you to delete an INFO table. It opens when you select Utilities | Table Delete... from the Table Tool dialog.

☞ The Delete Info Table is not available under Windows 95. Specify Info directory path: Enter the full path of the source INFO directory. Table to be deleted: Click on the popup list to select the name of the table to be deleted. OK Click to delete the INFO table. Cancel Click to cancel the delete and close this dialog. Help Click to view the On-Line Help for this dialog.

87

Merge Info Tables

Merge Info Tables This dialog enables you to merge two INFO tables into a single one. This dialog opens when you select Utilities | Table Merge... from the Table Tool dialog or Merge... in the Open Info Table dialog.

☞ The Merge Info Tables dialog is not available under Windows 95. Info directory for input table: Enter the full path of the info directory for the first input table.

Input table: Click on the popup list to select the first input table to merge. Relate item (key): Click on the popup list to select the relate item. Place joined items after: Click on the popup list to select the item after which the items of the second input table are placed.

Info directory for join table: Enter the full path of the INFO directory for the second input table.

Join table: Click on the popup list to select the second input table to merge. Output Info directory path: Enter the full path of the destination INFO directory. Output table name: Enter the name of the output table. Relate type: Choose one of the following Linear Select this option if both tables have the relate item. Both tables can be sorted in any order. Ordered Select this option if both tables have the relate item and the join table is sorted on the relate item. Link Select this option if you want to use the relate item of the input table as the internal record number of the join table to match records. Only the input table must contain the relate item.

OK Click to merge the info tables. Cancel Click to cancel the merge and close this dialog. Help Click to view the On-Line Help for this dialog.

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Relate Manager

Relate Manager This dialog enables you to manage the current relate environment. A relate specifies how a source table can be temporarily joined (or related) with a target table by matching a particular key column in both tables. Since a relate does not specify the name of the source table, any table with the specified source column can use this relate. A relate is normally used to establish a soft link between two tables. When a relate is applied to a table, a temporarily joint table is created that links the table with a target table specified in the relate. If you want to create a permanent joint table, use the Merge Info Tables dialog. Relates exist in the tabletool relate environment once they are created or loaded, until the tabletool is terminated. They can be saved to an INFO table, and loaded from an INFO table to the current relate environment. You can use the relate manager to load, save, edit, use existing relates, or define new relates.

☞ The Relate Manager dialog is not available under Windows 95. This dialog opens when you select Relate | Relate... from the Table Tool dialog.

Relate List: Lists all relates in the current relate environment. Relate Description: Displays the definition of the selected relate. Source Column: Displays the name of the key column in the source table to relate from. Target Info Directory: Displays the info directory where the target table resides. Target Table: Displays the name of the target table to relate to. Target Column: Displays the key column in the target table to relate to.

OK Click to use the selected relate (soft link the current table with the target table and display it).

Edit... Click to modify an existing relate. The Edit Relate dialog opens. New... Click to create a new relate. The Creating New Relate dialog opens. Open... Click to open an existing INFO table that contains relates and add them to the current relate environment. The Open New Relates dialog opens.

Save... Click to save the current relates into a table. The Save Relates dialog opens. Delete... Click to delete the selected relate from the current relate environment.

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Relate Manager

Dismiss Click to dismiss (close) this dialog. Help Click to view the On-Line Help for this dialog.

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Edit Relate

Edit Relate This dialog enables you to modify an existing relate. It opens when you click on Edit... in the Relate Manager.

☞ The Edit Relate dialog is not available under Windows 95. Relate Name: Enter the name of the relate. Source Column: Enter the key column name of the source table to relate from. Target Info Directory: Enter the info directory where the target table resides. Target Table: Click on the popup list to select the target table to relate to. Target Column: Click on the popup list to select the target column to relate to. OK Click to save the edits to the relate. Dismiss Click to dismiss (close) this dialog. Help Click to view the On-Line Help for this dialog.

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Creating New Relate

Creating New Relate This dialog enables you to create a new relate. It opens when you click on New... in the Relate Manager.

☞ The Creating New Relate dialog is not available under Windows 95. Relate Name: Enter the name of the new relate. Source Column: Enter the key column name of the source table to relate from. Target Info Directory: Enter the info directory where the target table resides. Target Table: Click on the popup list to select a target table to relate to. Target Column: Click on the popup list to select a target column to relate to. OK Click to confirm adding relate to the current relate environment. Dismiss Click to dismiss (close) this dialog. Help Click to view the On-Line Help for this dialog.

92

Open New Relates

Open New Relates This dialog enables you to open an existing table that contains relates and then add them to the current relate environment. This dialog opens when you click on Open... in the Relate Manager.

☞ The Open New Relates dialog is not available under Windows 95. Info Directory Path: Enter the name of the info directory where the table of relates resides.

Table of Relates to Open: Specify the table name that contains relates to open. OK Click to open the table of relates and add them to the current relate environment. Dismiss Click to dismiss this dialog. Help Click to view the On- Line Help for this dialog.

93

Save Relates

Save Relates This dialog enables you to save current relates into an INFO table. This dialog opens when you click on Save... in the Relate Manager.

☞ The Save Relates dialog is not available under Windows 95. Info Directory Path: Enter the name of the info directory where the table of relates to be saved to.

Table to Save Relates to: Specify a new table to save to or an existing table to overwrite.

OK Click to save current relates to the table name specified. Dismiss Click to dismiss (close) this dialog. Help Click to view the On-Line Help for this dialog.

94

Define Projection Parameters of the Coverage

Define Projection Parameters of the Coverage This dialog enables you to define projection information for a vector coverage. It opens when you select Edit | Define Coverage Projection... from the Vector Info dialog.

Define Map Units: Click on this popup list to define the map units for this coverage. METERS FEET

The map units for the coverage are meters.

The map units for the coverage are feet.

RADIANS

The map units for the coverage are radians.

DMS - deg./min./sec. The map units for the coverage are degrees/minutes/seconds. DD - decimal degrees

The map units for the coverage are decimal degrees.

DM - decimal minutes

The map units for the coverage are decimal minutes.

DS - decimal seconds

The map units for the coverage are decimal seconds.

Edit Projection Parameters... Click to edit or view the projection parameters. The Projection Chooser dialog is opened.

OK Click to accept the projection parameters and close this dialog. This option is disabled until you define/change the parameters.

Cancel Click to cancel this process and close this dialog. Help Click to see this On-Line Help document. ➲ For information on using the ERDAS IMAGINE graphical interface, see the on-line IMAGINE Interface manual.

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Re-Project Coverage Coordinates

Re-Project Coverage Coordinates This dialog enables you to reproject a vector coverage from one coordinate system to another. It is opened when you select Edit | Re-project the Coverage... from the Vector Info menu bar.

Output Vector Layer: Enter the name of the new, reprojected coverage. You cannot write to an existing file.

Define New Projection... Click to define the parameters of the new projection. The Projection Chooser dialog is opened.

Define Map Units: Click on this popup list to define the map units for this coverage. METERS FEET

The map units for the coverage are meters.

The map units for the coverage are feet.

RADIANS

The map units for the coverage are radians.

DMS - deg./min./sec.

The map units for the coverage are degrees/minutes/seconds.

DD - decimal degrees

The map units for the coverage are decimal degrees.

DM - decimal minutes

The map units for the coverage are decimal minutes.

DS - decimal seconds

The map units for the coverage are decimal seconds.

OK Click to accept the projection parameters and close this dialog. This option is disabled until you define the projection parameters.

Cancel Click to cancel this process and close this dialog. Help Click to see this On-Line Help document. ➲ For information on using the ERDAS IMAGINE graphical interface, see the on-line IMAGINE Interface manual.

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Specify a Clip Coverage

Specify a Clip Coverage This dialog enables you to mosaic only the areas in which you are interested by specifying a clip coverage. This dialog is opened when you click on Specify a clip coverage in the Mosaic Polygon Coverages dialog.

☞ The Specify a Clip Coverage dialog is not available under Windows 95. ☞ In ERDAS IMAGINE filename parts, you can enter a wildcard with the following extensions to search for ARC/INFO data: *.arcinfo to search for ARC/INFO coverages (IMAGINE vector layers) *.grid to search for GRIDs *.stk to search for a stack of GRIDs *.vpf to search for VPF data *.wksp to search for workspaces These are not the actual file extensions used on these files. They are simply cues that tell IMAGINE the type of data for which you are searching.

Clip Coverage: Enter the name of the vector layer that you want to use as the clip coverage. The outer boundaries of the polygons in this coverage will be used as the clip area.

OK Click to use the selected coverage and close this dialog. Cancel Click to cancel this process and close this dialog. Help Click to see this On-Line Help document. ➲ For information on using the ERDAS IMAGINE graphical interface, see the on-line IMAGINE Interface manual.

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Specify a Template Coverage

Specify a Template Coverage This dialog enables you to use a template coverage when mosaicking polygon coverages. The template will determine which features are mosaicked. This dialog opens when you click on Specify a template coverage in the Mosaic Polygon Coverages dialog.

☞ The Specify a Template Coverage dialog is not available under Windows 95. ☞ In ERDAS IMAGINE filename parts, you can enter a wildcard with the following extensions to search for ARC/INFO data: *.arcinfo to search for ARC/INFO coverages (IMAGINE vector layers) *.grid to search for GRIDs *.stk to search for a stack of GRIDs *.vpf to search for VPF data *.wksp to search for workspaces These are not the actual file extensions used on these files. They are simply cues that tell IMAGINE the type of data for which you are searching.

Template Coverage: Enter the name of the template coverage to use. OK Click to use the selected coverage and close this dialog. Cancel Click to cancel this process and close this dialog. Help Click to see this On-Line Help document. ➲ For information on using the ERDAS IMAGINE graphical interface, see the on-line IMAGINE Interface manual.

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Raster to ARC/INFO Coverage

Raster to ARC/INFO Coverage This dialog enables you to convert a raster layer to a vector layer. It opens when you click OK in the Raster to Vector dialog. Special consideration is needed to determine what image files will convert successfully. The Line option is intended to convert scanned maps or previously converted line coverages. The Polygon option works well if the image is less than 512 x 512 in size and not too complex (such as classified or smoothed images). Raw, complex images may create too many small polygons or too many small island polygons inside larger polygons than can be easily interpreted. In this case, the image should be reclassified or smoothed before attempting the conversion.

Select a band to convert: Click on this popup list to select which band of the raster file to convert to vector format.

Coordinate Indicate which coordinate system to use to select a subset to convert. Map

Click to use map coordinates.

File

Click to use file coordinates.

Subset Definition: Specify the subset area to convert. UL X:

Enter the upper left X coordinate of the subset to convert.

UL Y:

Enter the upper left Y, coordinate of the subset to convert.

LR X:

Enter the lower right X coordinates of the subset to convert.

LR Y: Enter the lower right Y coordinates of the subset to convert.

Output Coverage Type: Indicate the type of output coverage you want to create. Polygon Click to create a polygon coverage. This option works well if the size of the image is less than 512 x 512 and is reasonably complex (such as a classified or smoothed image). Complex, raw images may create more small polygons or more island polygons within larger polygons than can be easily interpreted.In this case further processing might be needed before doing the conversion. Line Click to create a line coverage.This option is intended to convert scanned maps or line features of an image file previously converted from a vector coverage by the Vector to Raster utility using the line option. Point

Click to create a point coverage.

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Raster to ARC/INFO Coverage

Vectorization Options: If you are creating a line coverage, you can specify different vectorization options. If you are creating a polygon coverage, only weed tolerance is relevant. Foreground Specify which pixels will be considered foreground pixels. Foreground pixels form the linear features to be converted to vectors. POSITIVE All pixels whose values are greater than zero belong to the foreground. All pixels whose values are less than zero or NODATA will belong to the background. DATA All pixels with values will belong to the foreground. All pixels whose value is NODATA will belong to the background. Junction Shape ROUND

Specify the appearance of line turns. Line turns will be rounded.

This option is best for preserving natural features, such as contours. SHARP

Line turns will be sharp.

This option is best for preserving man-made features, such as streets. Thinning Click to thin foreground pixels before vectorization. This option will allow the program to run much faster.

➲ Thinning specifies whether or not the foreground cells of the grid will be thinned before vectorization. The Thinning process thins the line so the user may identify its location on the original image by reducing the width of the original band. Use Filter Click to smooth the boundaries between foreground and background pixels. This option is valid only if Thinning is used. The grid will be filtered to smooth the boundaries between foreground and background cells.

➲ Smoothing adds more vertices or points to the line so it appears curved instead of sharp. INFO Item Name: Enter the name of the item in the arc attribute table of the output vector layer to contain the attribute of the grid cell. If # is entered, no item or attribute information will be written to the arc attribute table.

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Raster to ARC/INFO Coverage Thickness: Enter the maximum thickness, in map units, of linear features in the input raster layer. The default is 10X the cell size if the Thinning option is used, or 2X the cell size if Thinning is not used. Dangle Length: Enter the minimum length, in map units, of dangling arcs that will be retained in the output vector layer. The default is 0.7 x the thickness if the Thinning option is used, or 0.0 if Thinning is not used. Weed Tolerance: Enter the weed tolerance, in map units, for the generalization of arcs. The default is 0.00. This is the minimum distance between vertices on a line.

OK Click to convert the layer and close this dialog. Cancel Click to cancel the conversion and close this dialog. Batch Click to include this function in a batch file. Help Click to see this On-Line Help document. ➲ For information on using the ERDAS IMAGINE graphical interface, see the on-line IMAGINE Interface manual.

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Convert Vector Layer to Raster Layer

Convert Vector Layer to Raster Layer This dialog enables you to convert a vector layer to a raster layer. It opens when you click OK in the Vector to Raster dialog. Converting a large vector coverage will require a large amount of disk space for scratch files in the current directory (where you start ERDAS IMAGINE) and considerable response time.

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Vector to Raster writes temporary files to the vector scratch file directory (either linegrid.aml, plygrid.aml, or pointgrid.aml), and then deletes them when finished. if the files already exist, they are overwritten.

Input Coverage Type: Specify the input vector layer type to convert. Polygon

The layer you want to convert contains polygons.

➲ For more information see Rules for Pixel Inclusion within Polygons. Line Point

The layer you want to convert contains lines. The layer you want to convert contains points.

Subset Definition (in Map Coord’s): You can specify a subset to convert in map coordinates. UL X: Enter the upper left X map coordinates of the subset to convert. UL Y: Enter the upper left Y map coordinates of the subset to convert. LR X: Enter the lower right X map coordinates of the subset to convert. LR Y: Enter the lower right Y map coordinates of the subset to convert.

Output Options: Specify the following output options. Pixel Size Specify the pixel size of the file. The default is x_range of the coverage/1000, or 40 if x_range is not available. Block Size:

Specify the block size. The default is 64.

Lookup Table File: Enter the name of the INFO file used to define grid cell codes. If a file is specified, the lookup table must contain two items: VALUE and CODE. The CODE must be defined as numeric in INFO. The lookup table must be sorted in ascending order based on the VALUE Item.

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Convert Vector Layer to Raster Layer

☞ You must be running ERDAS IMAGINE from the current workspace for this option to work. On Windows machines, the current session is started in the Session | Session Log... off the main menu. You must specify the complete path of the info. table. If the complete path is not given, the program assumes the info. table is in the current workspace. Weight Table File: Enter the name of the INFO file to be used to assign weights to the grid cell codes. These weights are used to resolve cases when a single cell can have several possible codes. In this case, the code with the highest weight will be assigned to the cell. The weight table must have two items: CODE and WEIGHT. Both items must be defined as numeric in INFO. If a code is not in the weight table, it is assigned a weight of 0. The weight table must be sorted in ascending order based on CODE.

☞ You must be running ERDAS IMAGINE from the current workspace for this option to work. On Windows machines, the current session is started in the Session Log off the main menu. You must specify the complete path of the info. table. If the complete path is not given, the program assumes the info. table is in the current workspace. Output Image Type: Thematic

Select the type of output file to create.

Click to create a thematic layer.

Continuous

Click to create a continuous layer.

Output Pixel Data Type: Data Compression:

Click on this popup list to specify the output data type.

Click on this popup list to specify data compression type.

An Item as Pixel Value: Specify an item in the input coverage AAT or PAT that is used to assign codes to the grid. By default, the internal fault ID (coverage_name#) is used. Background Cell Value: Specify the value for cells which do not overlay line/point features in the coverage. This option is valid for line and point coverages only. NODATA If Output Pixel Data Type: is signed, the raster background value will be a very large negative number. If it is unsigned, the raster background value will be zero. ZERO

The raster background value is always zero.

Create Pyramid Layers

Click to create pyramid layers for the output raster layer.

Ignore Zero in Output Stats. output raster layer.

Click to ignore zeros when computing statistics for the

OK Click to convert the selected file and close this dialog. Cancel Click to cancel this process and close this dialog.

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Convert Vector Layer to Raster Layer

Batch Click to include this function in a batch file. Help Click to see this On-Line Help document. ➲ For information on using the ERDAS IMAGINE graphical interface, see the on-line IMAGINE Interface manual.

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