Preferences

Preferences 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.

Preferences On-Line Manual Annotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Batch Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Image Catalog . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 DataView . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 User Interface & Session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 DEM Exporter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 DOQ Exporter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 SDTS Raster Exporter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Image Files (General) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 FIT Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Gallium Font Server . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 GCP Editor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 GRID Image Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 ImageDrape . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 ImageInfo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 IMAGINE Image Files (Native) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 Raster Import (General) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Knowledge Engineer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

iii

Preferences On-Line Manual Map Legends . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 Map Composer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 Map Printing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 Spatial Modeler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 Movie . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 OrthoBASE Preferences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 Raster Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 Raw Image Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 RPF Image Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 TIFF Image Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 Vector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 Viewer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 Viewshed Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 VirtualGIS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67 Virtual World Editor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

iv

Annotation

Annotation These preferences affect annotation.

Annotation Text Units Enter the default units to use to measure text. Choose from inches, centimeters, or points. The default is points.

Annotation Text Height Enter the default text size in the units selected above. The default is 10.000.

Text Fill Order Enter the order to use when filling text. Select either Fill-First or Fill-Last. Fill-First means fill then outline and Fill-Last means outline then fill. The default is Fill-First.

Mitre Limit Limit of mitre length divided by the line width. The default is 3.000.

Annotation Symbol Size Enter the size to display symbols. The default is 10.000.

Annotation Symbol Units Enter the units used to specify the annotation symbol size above. Valid options are inches, centimeters, and points. The default is points.

Enable Labeling All Grid/Ticks Enable labeling of all geographic grid/ticks regardless of how they intersect the frame edges. The default is “no”.

1

Annotation

In this example, this grid/tick would not be labeled by default. All other geographic grid/ticks would be labeled. When the Enable Labeling All Grid/Ticks preference is enabled (preference set to “yes”), ALL geographic grid/ticks are labeled.

2

Batch Processing

Batch Processing Batch processing allows you to process one or more files with one or more commands at any time from one minute to many years in the future. This is useful if you have a process that requires a long time to run and you want to run it when your system is at minimum utilization (e.g., during the night).

➲ Under Windows NT, a job cannot be scheduled beyond the end of the current month. Run Batch Commands in Record Mode - Run commands as they are inserted into the Batch record dialog. This is used when running through a multiple step process which will need the outputs of the earlier processes as input to the following steps. The default is yes.

Line Termination for Output Batch Files - Determine the type of line termination to use for output command (.bcf) and namelist (.bls) files. The batch system itself is not sensitive to the line termination type. This is provided so that the batch files that are created may be used with text editors which may not be flexible enough to deal with differing line termination. The default is windows.

View Batch Queue Update Interval - Time (in seconds) between updates of the Batch queue view window. The batch queue window scans the batch queue directory periodically to determine the state of the existing batch jobs. Setting this to a small number (1 second) will keep the list of batch jobs up to date, but it will cause a lot of directory scanning. The default of 10 is a good compromise. The default is 10.000.

Show Status Bar On Batch Queue Dialog - Display a status bar on the Batch Status Queue dialog. This is provided as a cosmetic preference, some users may not want the status bar taking up space on the Batch Queue Dialog. The default is no.

Batch Job Directory - The directory where the batch job files will be placed. This directory will contain a subdirectory for each of the host computers on which batch has been run. Within each of these directories there will a subdirectory for each user that has used batch on that machine. The default is $PERSONAL/batch.

3

Batch Processing

Show Status Bar On Batch Wizard - Displays a status bar on the batch wizard dialog.This is provided as a cosmetic preference, some users may not want the status bar taking up space on the Batch Wizard. The default is yes.

Startup Batch Command File - The batch command file to include in offline processing. This is a command file that is run just prior to the batch commands them selves. On Windows this should be a .bat file and on UNIX it is a shell script file. The purpose is to allow things like disk remounts to happen. There is no default.

Show jobs in Scheduled Tasks folder - This preference is displayed under Windows only. Selecting this option makes the job visible in the Scheduled Tasks folder in the Explorer. However, when the job runs, the Task Scheduler displays a DOS command shell window while the job is running. If this window is not desired, then deselect this option. Deselecting this option also makes the job invisible in the Scheduled Tasks folder. If you want this to be disabled by default, change this preference to no. The default is yes.

4

Image Catalog

Image Catalog These preferences affect the Image Catalog.

Catalog Directory Enter the path for catalogs. The default is $HOME.

Default Catalog

Enter the name of the catalog to open when the Image Catalog is first

initiated. The default is default.ict.

Canvas Directory

Enter the path where the vector backdrops are stored.

The default is $IMAGINE_HOME/etc.

Canvas Backdrop

Enter the name of the vector backdrop that is opened when the graphical viewer is first invoked. The default is $IMAGINE_HOME/etc/backdrops/world.

Archive Media

Enter default media device to use in archiving images as either tape_8mm, tape_9_track, tk_device, or tape_exabyte. The default is tape_8mm.

Water Color Right-hold the color patch to select the color to be used for water in the graphical viewer. The default is light blue (193, 254, 254).

Land Color Right-hold the color patch to select the color to be used for land in the graphical viewer. The default is tan (226, 216, 191).

Border Color Right-hold the color patch to select the color to use for borders in the graphical viewer. The default is black (0, 0, 0).

Line Style Right-hold the color patch to select the color to use for lines in the graphical viewer.

5

Image Catalog The default is black (0,0,0).

Point Symbol Select the symbol to be used for points in the graphical viewer. Choose either a cross-hair or a point. The default is a crosshair.

Symbol Color Right-hold the color patch to select the color to be used for point symbols. The default is black (0, 0, 0).

Symbol Size Enter the point size of point symbols. The minimum is 1.0. The default is 10.0

Footprint Color Right-hold the color patch to select the color to be used for image footprints. The default is red (255, 0,0).

Footprint Selected Color Right hold the color patch to select the color to be used for selected image footprints. The default is yellow (255, 255, 0).

Footprint Fill Style Select the style used to fill image footprints. Choose unfilled, 50% fill, or hatch pattern. The default is 50% fill.

Show Map Grid Indicate whether to control the display of the map grid at startup. The default is yes.

Grid Color Right-hold the color patch to select the color to be used for the Latitude/ Longitude grid. The default is black (0, 0, 0).

Show Grid Labels Indicate whether to control the display of the text grid labels. The default is yes.

Grid Label Color Right-hold the color patch to select the color to be used for map grid text labels.

6

Image Catalog The default is black (0, 0, 0).

Level of Detail

Select the maximum level of detail to be used when displaying maps. Choose global, regional, subregional, or local.

Show Map Outlines Select yes or no to display the map outlines at startup. The default is no.

Map Outline Color Right-hold the color patch to select the color to be used for the map outlines. The default is gray (128, 128, 128).

Map Outline Style Select the line style to be used for the map outlines. Choose solid lines or dashed lines. The default is Solid.

Restore Directory

Enter the path of the directory into which images are restored.

The default is ‘.’ (the current directory - the ERDAS IMAGINE start-up directory indicated at the top of the Session Log).

7

DataView

DataView These preferences control the DataView application.

Maximum Line Length Select the maximum line length for displaying record contents. The minimum is 10. The default is 80.

8

User Interface & Session

User Interface & Session These preferences affect general operations in ERDAS IMAGINE, such as displaying different types of data.

Default Data Directory Enter the path for input data. This directory will be the default in all dialogs that require an input file. The default is $IMAGINE_HOME/examples.

Default Output Directory Enter the path for output files. This will be the default directory in all dialogs that require an output file. The default is ‘.’ (the current directory - the ERDAS IMAGINE start-up directory indicated at the top of the Session Log).

Default Icon Directory

Enter the path for the icons used in the ERDAS IMAGINE

graphical interface. The default is $IMAGINE_HOME/icons.

Icon Panel Orientation

Select whether the ERDAS IMAGINE icon panel should display horizontally across the top of the screen or vertically down the left side of the screen when ERDAS IMAGINE is started. The default is horizontal.

Icon Panel Display Options Select the size of the icons to use in the ERDAS IMAGINE icon panel, or to use the ERDAS IMAGINE tool bar without icons. The default is Standard Icons.

File History Maximum Select the maximum number of entries in the file names history. The minimum is 10; the maximum is 1000. The default is 20.

File History Scope Select the scope for the retention of file names. User names will be retained from session to session. Session names will be retained only for the current session. Application names will be retained only for each application. The default is a user name.

Double Click Interval This preference sets the maximum length of time in milliseconds between two clicks for the clicks to be considered a double-click. 9

User Interface & Session The default is 300.000.

Application Timeout Utilities like Text Editor, Image Info, Vector Info, HfaView, etc., remain available after all documents are closed for faster response. These programs will terminate after the time specified. The default is 10.000 minutes.

Positive Rotation Direction Enter the positive rotation direction to be used for rotating annotation elements, such as arcs, ellipses, rectangles, text, and symbols. The valid options are Clockwise and Counter-Clockwise. The default is Counter-Clockwise.

Unix Printer Command (UNIX only) Enter the command to use to send output to a PostScript printer. The default is lpr.

CellArray 3D Appearance

Indicate whether you want the column titles and row numbers in CellArrays to have a three-dimensional appearance. The default is yes.

Use Flat Look For Tools (PC only) IMAGINE 8.4 for Windows now supports the flat appearance for buttons in toolbars and tool palettes. If the previous raised appearence is desired, this can be turned off. The default is yes.

Panel Background Color (UNIX only) Right-hold this color patch to select a background color for windows. The default is light gray (201, 206, 204).

Menu Text Font (UNIX only) Select the font style for the menus. Choose normal, bold, normal italic, or bold italic. The default is bold.

Menu Text Color (UNIX only) Select the color for the text in the menus. The default is black (0, 0, 0).

Menu Color (UNIX only) Select the default color for menus. 10

User Interface & Session The default is gray (201, 206, 204).

Title Text Font (UNIX only) Select the font style for the label text. Choose normal, bold, normal italic, or bold italic. The default is bold.

Title Text Color (UNIX only) Select the color for title text. The default color is black (0, 0, 0).

Text Font (UNIX only) Select the font style for the text in the text entry and selection areas. Choose normal, bold, normal italic, bold italic. The default is bold.

Text Font Color (UINIX only) Right-hold this color patch to select the color for the font in the text entry and selection areas. The default is black (0, 0, 0).

Text Background Color (UNIX only) Right-hold this color patch to select a background color to use for all dialog parts where text is entered. The default is white (255, 255, 255).

Indicator Color (UNIX only) Right-hold this color patch to select the color for enable indicators. The default is dark gray (91, 91, 91).

Selection Color (UNIX only) Right-hold this color patch to select the background color for selected text. The default is yellow (255, 255,0).

Selection Secondary Color (UNIX only) Right-hold this colorpatch to select the background color for the secondary selected text. The default is cyan (0, 255, 255).

Selection Overlap Color

(UNIX only) Right-hold this color patch to select the background color for the overlap of primary and secondary selections. The default is chartreuse (0, 255, 0).

11

User Interface & Session

Slider Thumb Color (UNIX only) Right-hold this color patch to select the color for the drag control in sliders. The default is light gray (200, 200, 200).

Slider Background Color (UNIX only) Right-hold this color patch to select the background color in sliders. The default is gray (170, 170, 170)

Status Text Font (UNIX only) Select the font to be used for status text. Choose normal, bold, normal italic, or bold italic. The default is normal.

Status Text Color (UNIX only) Right-hold this color patch to select the color to be used for status text. The default is black (0, 0, 0).

Move cursor to cancel button Choose to have the cursor automatically move to the Cancel or Close button when a dialog is opened. The default is no.

Use Bubble Help Specify whether or not to have bubble Help display as your cursor moves across IMAGINE dialogs. This information is the same as the Status Bar Help, but is opened directly under your cursor. The default is no.

Bubble Help Delay Specify the length of time, in seconds, that the cursor must remain on an icon before the bubble Help will display. The default is 1.000 second.

Focus Behavior (UNIX only) Automatically select text when your cursor is moved to a text or number part (select) or have the cursor go the beginning of the field (noselect). The default is select.

Dialogs Follow Parent (UNIX only) Indicate whether dialogs will minimize and close with the parent frame. The default is yes. 12

User Interface & Session

Use Preference Editor Dialog Select the preference editor you prefer. The default (checked) is the newer style. Uncheck the checkbox to revert to the older style.

☞ Be sure to close any children dialogs before toggling the borders of a parent frame. Children dialogs could close and become inaccessible if left open when the borders of a parent frame are toggled.

Enable Script Debugging Turn this option on if you are debugging EML scripts to provide more feedback in the Session Log when scripts are run. This option should be off while you are running ERDAS IMAGINE. The default is no.

Open Log on Startup

Specify whether or not to have the Session Log automatically open when ERDAS IMAGINE is started. The default is no.

Log File Directory and Template

Enter the file in which to save Session Log files.

The default is $HOME/imagine log%t. (%t places a time stamp at the end of the file name.)

History File Directory and Template

Enter the path of the command history file.

The default is $HOME/imagine_history%t. (%t places a time stamp at the end of the file name.)

Delete Session Log on Exit

Specify whether or not the Session Log file should be deleted when you exit ERDAS IMAGINE. The default is no.

Delete History File on Exit

Indicate whether the command history file should automatically be deleted upon terminating an ERDAS IMAGINE session. The default is no.

Keep Job Status Box

Specify whether to display the Job Status dialog until the user clicks OK (yes) or to automatically close upon job termination (no). The default is yes.

13

User Interface & Session

Log Message level

Specify the level of detail about IMAGINE processes that is reported in the Session Log. The options are verbose (very detailed) and terse (less detailed). To view the stderr or stdout output of an EML “system” built-in command or “system” built-in function, the preference must be set to verbose. The default is terse.

Session Log Printing

Specify whether to always print the Session Log upon terminating an IMAGINE session, query the user about printing, or to never print the Session Log. The default is query.

Log Message time format

Enter the format in which time is recorded in the Session

Log. The default is dd/mm/yy hh:mm:ss.

Temporary File Directory

Enter the temporary file directory. This should be set to a directory with plenty of disk space. If a non-directory file or a non-existent directory is specified, the default will be used. The default is /tmp.

Override colormap Install (UNIX only) Override window manager colormap install. The default is no.

Colors other apps can access (UNIX only) Number of static colors. The valid options are 0, 64, and 125. The default is 0.

Beep after Job finished

Indicate whether or not you want the system to beep when

a job is finished. The default is no.

AVHRR Red Band Default Enter the band to be read into the red color gun when NOAA AVHRR data are displayed in the Viewer. The valid options are 1.000, 2.000, 3.000, 4.000, and 5.000. The default is 1.000.

14

User Interface & Session

AVHRR Green Band Default Enter the band to be read into the green color gun when NOAA AVHRR data are displayed in the Viewer. The valid options are 1.000, 2.000, 3.000, 4.000, and 5.000. The default is 2.000.

AVHRR Blue Band Default Enter the band to be read into the blue color gun when NOAA AVHRR data are displayed in the Viewer. The valid options are 1.000, 2.000, 3.000, 4.000, and 5.000. The default is 4.000.

MSS Red Band Default Enter the band to be read into the red color gun when Landsat MSS data are displayed in the Viewer. The valid options are 1.000, 2.000, 3.000, and 4.000. The default is 4.000.

MSS Green Band Default

Enter the band to be read into the green color gun when Landsat MSS data are displayed in the Viewer. The valid options are 1.000, 2.000, 3.000, and 4.000. The default is 2.000.

MSS Blue Band Default

Enter the band to be read into the blue color gun when Landsat MSS data are displayed in the Viewer. The valid options are 1.000, 2.000, 3.000, and 4.000. The default is 1.000.

Spot Red Band Default

Enter the band to read into the red color gun when SPOT XS data are displayed in the Viewer. The valid options are 1.000, 2.000, and 3.000. The default is 3.000.

Spot Green Band Default

Enter the band to be read into the green color gun when SPOT XS data are displayed in the Viewer. The valid options are 1.000, 2.000, and 3.000. The default is 2.000.

Spot Blue Band Default Enter the band to be read into the blue color gun when SPOT XS data are displayed in the Viewer. The valid options are 1.000, 2.000, and 3.000. The default is 1.000.

15

User Interface & Session

TM Red Band Default

Enter the band to be read into the red color gun when Landsat TM data are displayed in the Viewer. The valid options are 1.000, 2.000, 3.000, 4.000, 5.000, 6.000, and 7.000. The default is 4.000.

TM Green Band Default

Enter the band to be read into the green color gun when Landsat TM data are displayed in the Viewer. The valid options are 1.000, 2.000, 3.000, 4.000, 5.000, 6.000, and 7.000. The default is 3.000.

TM Blue Band Default

Enter the band to read into the blue color gun when Landsat TM data are displayed in the Viewer. The valid options are 1.000, 2.000, 3.000, 4.000, 5.000, 6.000, and 7.000. The default is 2.000.

Image Chip Work Effort Set the work effort for displaying image chips. Options are listed in decreasing speed, with Ignore as the fastest level.

Ignore Never attempt to show an image chip. Display Display .chp files only (even if they are out-of-date). Quick Compute Display up-to-date .chp files and compute chips if pyramid layers present.

Quick Update Update out-of-date .chp files and save. Update Always compute and save .chp files. The default is Quick Compute.

Default plotter for map compositions (UNIX only) Enter the default printer/plotter for map composition output. The default is No Printer Defined.

Perform fast directory scans when possible? (UNIX only) Indicate whether, when possible, to use simple filename pattern matching, rather than full verification. The default is true.

16

DEM Exporter

DEM Exporter These preferences provide default information that is used when you export .img files to DEM format.

Alaska Dem Type Select the geographic (not UTM) DEM type of latitudes above 50 degrees North. Choose Alaska 15 Minute, Alaska 7.5 Minute, 30 Minute, or 1 Degree. The default is Alaska 15 Minute.

Regular DEM Type Select the geographic (not UTM) DEM type for latitudes below 50 degrees North. Choose 30 Minute, 1 Degree, Alaska 15 Minute, or Alaska 7.5 Minute. The default is 30 Minute.

Free Format Text Select the length of the free format descriptor field. There is no default.

Process Code None

Select the process used to produce this DEM.

Assume no particular process.

RESAMPLE - Autocorrelation GRIDEM - Manual Profile CTOG - DLG/Hypsography CTOG or LINETRACE).

Simple bilinear (Was GPM).

Simple bilinear. Was DLG2DEM (includes any DLG type process such as

DCASS - Contour Interpolation 4-direction linear. LINETRACE - DLG/Hypsography CPS-3, ANUDEM, GRASS Polynomial. Electronic Imaging sensor systems.

Interpolation from photogrammetric system contours Complex linear LT4X.

DLG/hypsography CPS-3, ANUDEM, GRASS Complex

Electronic imaging (non-photogrammetric), active or passive,

The default is None.

Sectional Indicator Used by 30-minute DEMs to identify 1:100000 scale sections. There is no default.

17

DEM Exporter

Free Format Mapping Origin Code The maximum is 4 characters. There is no default.

DEM Level Code Select the code for the DEM level. Choose 1, 2, 3, 4; the minimum is 0. The default is 1.

Elevation Pattern Code Indicate the elevation pattern. Random is reserved for future use. The default is Regular.

Ground Distance Units Select the preferred units for distances measured on the ground. Choose none (specify every time), feet, or meters. The default is meters.

Geographic Angle Units Select the preferred units for latitude and longitude measurements. Choose none (specify every time), radians, or arc-seconds. The default is arc-seconds.

Elevation Units Select the preferred units for elevation measurements. Choose none (specify every time), feet, or meters. The default is meters.

Data Validation Flag These flags indicate the type of validation(s) performed. Consult DEM documentation. None

No validation performed.

TESDEM (no DES) review. WBE/TESDEM

RMSE computed from test points (record C added); no edit or

Batch process water body edit and RMSE computed from test points.

DES/WBE (no TESDEM) from test points.

Review and edit, including water edit. No RMSE computed

DES Level 1 Level 1 DEMs reviewed and edited, including WBE. RMSE from test points. DES/TESDEM Levels 2/3 everything.

Level 2 and 3 DEMs reviewed and edited, including

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DEM Exporter The default is None.

Void Pixel Minimum Value The minimum input pixel value that will be treated as void Void Pixel Maximum Value The maximum input pixel value that will be treated as void Vertical Datum Code Select the Vertical Datum to be specified for elevation values. Choose None (specify every time), Local Mean Sea Level, NGVD 29, or NAVD 88. The default is NGVD 29.

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DOQ Exporter

DOQ Exporter These preferences provide default information that is used when you export .img files to DOQ format.

Nation 1 Enter the primary nation of the source image. The default is US.

State 1 Enter the primary state of the source image using its two-letter abbreviation (e.g., GA for Georgia, MN for Minnesota).

County 1 Enter the three-digit code of the primary county of the source image. Producer Code Enter the production mapping center code. This number identifies the mapping center responsible for creating the digital orthophoto.

Production System Enter the hardware and software systems used to create the digital orthophoto.

Film Type Enter the manufacturer and ID of the film type. Focal Length Focal length, in millimeters, of the camera used to make the orthophoto. The default is 152.4 mm.

Scanner Type Scanner description, including manufacturer and model number. Scanning Resolution, X Scanner aperture resolution in X direction, in microns. The default is 25.

Scanning Resolution, Y Scanner aperture resolution in Y direction, in microns. The default is 25.

Scanning Sampling Resolution, X Scanner sampling resolution in X direction, in microns. The default is 25.

Scanning Sampling Resolution, Y Scanner sampling resolution in Y direction, in microns.

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DOQ Exporter The default is 25.

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SDTS Raster Exporter

SDTS Raster Exporter These preferences provide default information that is used when you export .img files to SDTS raster format.

Data Structure Describe the internal structure or organization of the data (e.g. \”DEM\”)”; Pixel Label A label (e.g. \”ELEVATION\”, \”INTENSITY\”) describing the value each pixel measures.

Scale Scale of corresponding paper map, if applicable (e.g. 100000 means 100,000:1). The minimum is 0.0. The default is 0.0.

Comment Any other comments relevant to the image as a whole Positional Accuracy

Assess the accuracy of point positions, including degree of compliance to the spatial registration standard.

Attribute Accuracy Assess the accuracy of measures made on a continuous scale. Logical Consistency Describe the fidelity of relationships encoded in the digital data, including the tests performed and their results. Completeness Describe selection criteria, definitions used, and other relevant mapping rules. The default is No suspect or void areas.

Security Class Security classification level Control Instructions for distribution and handling of the data. Release Instructions Instructions on release restrictions. Review Date

Reclassification date.

Review Instructions Reclassification instructions Security Comment Interleaving

Additional comments related to security.

Method used to encode multiple layers. Choose GI (BSQ), or GL (BIP).

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SDTS Raster Exporter The default is GL (BIP).

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Image Files (General)

Image Files (General) These preferences affect pyramid layer computation and statistics calculation.

Compute Pyramid Layers Indicate whether pyramid layers should be calculated automatically for new and imported images. The default is false.

Pyramid Layers External Indicate whether to allow pyramid layer disk space to be reclaimed upon deletion. The default is yes.

Pyramid Layer Computation Kernel Specify the kernel size to use when pyramid layers are created. Valid options are 2X2 and 4X4. The default is 2X2.

Initial pyramid layer number

Indicate the largest pyramid layer you want computed for new and imported images. This allows you to discard the largest pyramid layer(s), saving disk space at the expense of time spent reducing the image by zooming out. The pyramid layers of an image layer are numbered starting at 1, and increase by 1 for every reduction by 2 of the previous pyramid layer. Pyramid layer computation ceases when the resulting pyramid layer is as small or smaller than the default block size of 64 X64. A 1024X1024 image would have pyramid layers numbered 1, 2, 3, and 4, representing a reduction of the original image layer by 2, 4, 8, and 16, respectively. The default is 2.00.

Continuous Statistics Coverage Percent Enter the minimum percentage of pixels to be used when statistics are calculated for new and imported continuous images. Examples: In both of these examples, assume that the Continuous Statistics Coverage Percentage is set to10 percent and the Continuous Statistics Minimum Limit is set to10,000. Example 1: A 1000X1000 image. This image contains 1,000,000 pixels. 10 percent of that is 100,000 which is larger than 10,000, so 100,000 pixels would be used for statistics calculation. Example 2: A 200X200 image. In this case, the image contains 40,000 pixels. Since 10% of that is 4,000 which is less than 10,000, 10,000 pixels would be used for statistics calculation.

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Image Files (General) The default is 0.00 percent. This means the Continuous Statistics Minimum Limit is used.

Continuous Statistics Minimum Limit Specify the minimum number of data file values to use for the statistics computation of new and imported continuous images. The actual selection of the data file values is determined by the system. See examples in the above Continuous Statistics Coverage Percent. The default value is 10,000 data file values.

‘Hyperspectral Image’ Definition This preference allows you to define what a hyperspectral image is in terms of a minimum number of layers. The system makes certain space/time trade-offs when dealing with images. These trade-offs are different for hyperspectral and non-hyperspectral images. A hyperspectral definition avoids allocating huge amounts of memory in applications such as the profile tool. By default, when an image layer is opened, IMAGINE allocates a cache for raster data reads that is equivalent to 2 rows of blocks if the image had been blocked at the default block size (64X64). The size of this cache depends on the width of the file. However, this cache is a per layer cache; if accessing hyperspectral imagery (opening a layer stack with hundreds of layers) memory problems are likely to occur if that size of cache is allocated for each layer. The libraries use your hyperspectral definition to redefine the size of cache allocated. If the number of layers being opened at once is greater than the hyperspectral limit, only the equivalent of one block of data at the default block size will be allocated in the cache for that layer. If the hyperspectral limit is set to 999999, the profile tool or a model may have difficulty running on an image that has a large number of layers because a huge amount of memory will be allocated for caching raster data reads. A time trade-off occurs when processes in IMAGINE do not process an image layer in a block by block fashion or if they are dealing with an input and output with different block sizes. For instance, if a 100 band image that is essentially BIL is processed to an output image that has the default 64X64 block size, and the processing occurs according to the input block size, writing each line of the output is going to result in all W of the output blocks being read and written (where W is the image width / 64). As a result, there will be about 64 * W reads and writes to write the first row of blocks to the output whereas there would have only been W writes if the output had not been considered hyperspectral. By default, an image is considered a hyperspectral image if it contains 16 or more layers.

Table Row Maximum The table row maximum limits the size of image descriptor table columns that must be converted to a direct bin function from a table that contains one row of data per unique pixel value. This currently only happens when accessing GRID, STK, and GRID Stack data sets.

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Image Files (General) For example, if a GRID coverage contains the pixel values 1, 3, and 5, IMAGINE will simulate a direct bin function to access the descriptor data that will make the table appear to have five rows (even though only three exist). For five rows of data this does not cause a problem. If, however, the GRID coverage contains the pixel values 0, 1, 2, and 2 million, simulation of a direct bin function on this data set, although it contains only four unique values, will result in a table with 2 million rows of data. This preference allows a reasonable limit to be imposed so that performance is not adversely affected for applications that have no particular interest in the descriptor data.

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FIT Files

FIT Files The FIT format is a legacy image format from Silicon Graphics (SGI).

Use Memory Mapping with FIT Files - Use Memory Mapping to get an increase in I/ O speed. The memory mapping with FIT files should be on if you are using small FIT files as it speeds up the display of the images in the IMAGINE Viewer, and when used as input for other image processing. However, if using larger FIT images or a large number of FIT images simultaneously, then the preference should be off because it will consume a large amount of memory. The default is no.

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Gallium Font Server

Gallium Font Server Under UNIX this preference affects using TrueType and PostScript Type 1 fonts in IMAGINE annotation styles. This preference not available on Windows platforms. Name of the TrueType and PostScript FontServer file for TrueType and PostScript Type 1 files.

Select the name of the configuration

The default is $IMAGINE_HOME/etc/fonts/gallium_config.

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GCP Editor

GCP Editor This preference affects the GCP Editor

Selector Icon Select icon filename for GCP tool graphics. The default is gcp_select.icon.

Selector Text Font Select font name for GCP tool graphics. The default is 6 x 12.

Selector Color Right-hold the color patch to select the color for GCP tool graphics. The default is white (255, 255, 255).

GCP Tool Automatic Startup Indicate whether to start GCP tool if necessary for model solution. The default is true.

Use Chip Viewer(s) Indicate whether to set GCP tool Chip Viewer(s). The default is true.

Fully Automatic Edit Mode Indicate whether to set GCP tool Automatic Mode. The default is true.

Automatic Frame Arrangement Indicate whether to set GCP tool Frame Arrangement Mode. The default is true.

Source for Reference GCPs Select source for collecting reference GCPs. Choose Query User, Existing Viewer, Image Layer, Vector Layer, Annotation Layer, GCP File, ASCII File, Digitizing Tablet (Current), Digitizing Tablet (New), or Keyboard Only. The default is Query User.

Confirm Reference Projection Indicate whether to display Reference Projection Confirmation dialog at GCP tool startup. The default is true.

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GCP Editor

Rectify Outside Convex Hull of GCPs Rectify the outside area of GCPs for rubber sheeting. The default is false.

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GRID Image Files

GRID Image Files These preferences affect the GRID Image Files.

Maximum Table Range

Maximum number of rows for descriptor tables of 32-bit data

images. The default is 65536.0

Perform Rigorous Permission Check

If enabled, all GRID directories, files, and info directory files are checked prior to opening image. The default is no.

Recode Integer NODATA

If enabled, recodes NODATA values to the minimum of the integer data range selected for GRID access. The default is yes.

Recode Float NODATA

If enabled, recodes NODATA values to the minimum value of

the dataset. The default is yes.

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ImageDrape

ImageDrape These preferences affect the ImageDrape applications. Use Extensions Indicate whether to use OpenGL Extensions, if available, to optimize rendering. The default is yes. Update From Linked Position Position Selector in the Viewer. Onrelease

Select when to update display from the Linked

Updates display when selector is released.

Onuprelease

Updates display when Update is pressed.

The default is Onrelease. Show Coordinates As Select to show coordinates as Map or Lat/Lon. The default is Map. Eye/Target Colors Right-hold this color patch to select the color for Eye/Target icons displayed in the Viewer. The default is red (255, 0,0). Use Texture Objects images, if available.

Indicate whether to increase performance when displaying

The default is yes. Use Four Bit Textures Indicate whether to use fewer colors when displaying images. If available, will allow for a faster display. The default is no. Always Render Elevation Model Indicate whether to display Elevation Model when overlaying images, including those that do not cover the entire DEM. The areas not covered will be displayed. The default is no. Color of Saved Positions Right-hold this color patch to select the color of spheres displayed when showing saved positions. The default is red (255, 0, 0).

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ImageInfo

ImageInfo This preference affects the ImageInfo applications. Compute Statistics for All Layers computing statistics on all layers.

Specify whether to set the default value for

The default is true.

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IMAGINE Image Files (Native)

IMAGINE Image Files (Native) This preference affects accessing image files in the .img format.

Memory Map File Size Limit Enter the file size (in bytes) which to memory map the entire file. The minimum is 0 (zero). The default is 33554432.

Memory Map Segment Height Enter the target number of pixels-high a memory mapped layer segment should be. The minimum is 0 (zero). The default is 1024.

Reserved Non-raster Space The .img format is currently capable of storing up to 4GB of data (although operating system restrictions may impose a lower limit). A temporary workaround to this limitation has been introduced that allows raster layers that would cause the .img file to exceed the 4GB (or lower) limit to overflow into an external generic binary data file. The overflow will be triggered if the space currently occupied by raster data plus the Reserved Non-raster Space, plus the new raster to be added would exceed the 4GB limit. Therefore, by adjusting the Reserved Non-raster Space limit, the user can control when this overflow occurs. For example, if this limit is set to 4GB, all raster data will overflow into the external generic binary file. If it is set to 0 (zero), as much raster data as possible will be placed in the .img file. Note, however, that this runs the risk of being unable to save computed statistics, add image descriptor data, etc., once all of the raster data are written. The default reserved space (25MB) should reasonably accommodate non-raster data in all but the most extraordinary circumstances.

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Raster Import (General)

Raster Import (General) These preferences affect data import.

Default Block Size

Enter the default output block size.

The default is 64.000.

Ignore Zeros

Specify whether or not to ignore zeros when computing statistics.

The default is false.

Preview Image Size Indicate the image size for previews of imported data. Valid options are 512 (for 512 x 512 previews) and 1024 (for 1024 x 1024 previews). The default is 512.

Default Decimation Type

Specify the default decimation method to use for previews. Valid options are Average and Nearest. The default is Nearest.

Default Options File Path

Enter the path to use for files that store generic importing

parameters. The default is $IMAGINE_HOME/etc.

Delete Preview Image Indicate whether preview images (.preview.img) should be deleted when the Viewer in which the preview is displayed is cleared or closed. The default is false.

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Knowledge Engineer

Knowledge Engineer Default Confidence - Default confidence value for conditions. The default is 1.

Number of Best Classes Per Pixel - Default number of classes to compute per pixel. The default is 1.

Create Confidence Image - Default setting for computing confidence image. The default is false.

Create Feedback Image - Default setting for computing feedback image. The default is false.

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Map Legends

Map Legends These preferences affect legends in map compositions.

Default Legend Title

Enter the title to place at the top of legends.

The default is Legend.

Default Legend Units

Enter the units to use in measuring legend positioning options below. The valid options are Inches, Centimeters, and Points. The default is Points.

Underline Title

Indicate whether the legend title should be underlined.

The default is yes.

Title/Underline Gap

Enter the space between the title and the underline.

The default is 2.000.

Title/Legend Gap

Enter the space between the title and the legend.

The default is 12.000.

Title Alignment

Indicate how the legend title should be aligned with the main portion of the legend. The valid options are Left-Justified, Centered, and Right-Justified. The default is Centered.

Use Multiple Columns

Specify whether the legend should be in one column or in

multiple columns. The default is no.

Entries per Column

If you have specified multiple columns above, enter the maximum number of entries in a single column. The default is 15.000.

Gap Between Columns

Specify the amount of space to put between columns.

The default is 20.000.

Gap Between Entries

Specify the space between legend items.

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Map Legends The default is 7.500.

Heading/First Entry Gap

Specify the space between the heading and the first item in

the legend. The default is 12.000.

Text Gap

Specify the amount of vertical space between text.

The default is 5.000.

Vertically Stack Descriptor Text Specify whether or not you want to place descriptor text vertically. The default is no.

Place Patch Left of Text

Indicate whether you want to place the color patch to the left

of the text. The default is yes.

Place Patch Right of Text

Indicate whether you want to place the color patch to the

right of the text. The default is no.

Outline Color/ Fill Patch

Specify whether the color patch should have an outline.

The default is no.

Outline Symbol/Line/Text Patch Specify whether symbol/line/text patch should have an outline. The default is no.

Patch Width

Indicate the width of the color patch.

The default is 30.000.

Patch Height

Indicate the height of the color patch.

The default is 10.000.

Patch/Text Gap

Specify the amount of space between the color patch and the text.

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Map Legends The default is 10.000.

Patch/Text Alignment

Indicate how the text associated with each color patch is to be aligned with the patch. The valid options are Top-Justified, Centered, Bottom-Justified. The default is Centered.

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Map Composer

Map Composer These preferences affect Map Composer.

Default Map Directory

Specify the default directory for map compositions. This directory will display in the Open Map Composition dialog. The default is ‘.’ (the current directory - the ERDAS IMAGINE start-up directory indicated at the top of the Session Log).

Default Plot Directory Under UNIX enter the path for plot files (.plt extension) that are created from map compositions. The default is ‘.’ (the current directory - the ERDAS IMAGINE start-up directory indicated at the top of the Session Log).

Default Template Directory

Enter the path for map templates.

The default is ‘.’ (the current directory - the ERDAS IMAGINE start-up directory indicated at the top of the Session Log).

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Map Printing

Map Printing These preferences affect Windows Map Printing.

Strip Height Map are rendered in strips to improve performance. A strip height of 64 pixels is typically used. The default is 64.

Printing Data Transfer Compression Raster data transfer compression factor. Map printing can rely on the ability of the print device to scale data as a way to reduce the amount of data that must be sent to the device. The options are: none This option produces the highest resolution output. Any necessary data scaling will happen on the computer side. low This option produces good quality results and only requires one fourth of the amount of data as the “none” selection. The printer will scale raster data by 2. medium This option produces a better quality draft mode output. The printer will scale raster data by 4. high This option produces the lowest quality output of the choices and should be used as a draft mode printing. The printer will scale raster data by 8. The default is none.

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Memory

Memory Under UNIX these preferences affect the External Memory Management system. This is a system that the Viewer uses for managing large blocks of memory. A “large” block is any allocated piece of memory which is equal to or greater than 4,096 bytes. This system places these large blocks of memory in an area which is separate from the normal memory management system. The External Memory Management system is necessary because when software mixes the allocation of large blocks of memory with small blocks, memory fragmentation occurs. Memory fragmentation results in more memory being used than is necessary, and placing the large blocks of memory into a separate area greatly reduces this problem. The separate memory area is associated with a file in a user-defined directory. The default directory is /tmp. The External Memory Management system is completely configurable and can be controlled through these preferences. Follow these steps to use the External Memory Management system:

♦ Enter the file size in the Total Size of External Memory in Megabytes preference. ♦ Define the directory where the large blocks of memory will be placed in the Directory for the External Memory File preference. This directory must have enough space to contain the file size specified in the first step.

♦ Restart ERDAS IMAGINE. Directory for the External Memory File This preference defines the directory where the External Memory Management file will be created. When the file is created, it is given the following name in the defined directory: EXTMEM..<process_id> Once the file is created and associated with the memory manager, its entry is deleted from the directory. This is done so that the space will be automatically returned to the system when the Viewer is exited. The default is /tmp. This directory should be on a local disk. Placing the directory on a network will degrade performance.

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Memory

Total Size of External Memory in Megabytes This preference determines the actual amount of space in the External Memory Management file. If the amount of memory needed by the External Memory Manager exceeds this value, then subsequent memory will be allocated from the normal swap space. The default size 2.000, which is two megabytes. It is two megabytes because the /tmp directory (the default directory) often contains only three to four megabytes of space. After you define a larger directory for the External Memory Management file, you should set this number to about 10.000, which is ten megabytes. A value of 0.000 will disable the External Memory Management system.

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Spatial Modeler

Spatial Modeler These preferences affect Spatial Modeler (Model Maker and the Spatial Modeler Language). A majority of Image Interpreter functions are also affected by these preferences.

Model Directory

Enter the path for models.

The default is $IMAGINE_HOME/etc/models.

Model Maker Backup Font

Enter the font to use if the selected font does not exist.

The default is fixed.

Data Compression Specify the type of data compression to use on output files. Valid options are None and Run Length. The default is None.

Window Rule

Specify whether models will operate on the Union or Intersection of the

input files. The default is Union.

Cellsize Rule

Specify whether to use the Minimum or Maximum cell size of the input files when operating on images that have differing resolutions. The default is Minimum.

Thematic Interpolation

Indicate the resampling method to use on thematic images: Nearest Neighbor, Bilinear Interpolation, or Cubic Convolution. The default is Nearest Neighbor.

Continuous Interpolation Indicate the resampling method to use on continuous images: Nearest Neighbor, Bilinear Interpolation, or Cubic Convolution. The default is Nearest Neighbor.

Stats computation option

When statistics are calculated you can opt to Use all file

values or to Ignore specified value. The default is Use all file values.

Value to ignore in stats

If you selected to ignore a specific value above, you must

enter that value here.

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Spatial Modeler The default is 0.000.

Edge Extension Specify how to handle pixels outside the edge of files. Valid options are Fill with background and Reflect. The default is Fill with background.

Tile Size Enter the tile size for model processing. The minimum is 1; the maximum is 1000000. The default is 64.

Vector Tile Size Enter the tile size for rendering vector data to temp file. The minimum is 1; the maximum is 1000000. The default is 256.

Origin for Tables

Enter the default origin to use for all table objects.

The default is 0.000.

Origin for Matrices

Enter the default origin to use for all matrix objects.

The default is 0.000.

Origin for Rasters

Enter the default origin to use for all raster layer stacks.

The default is 1.000.

Binary File Type Enter the default file type to create for binary raster variables. The valid options are: 1 bit unsigned integer 2 bit unsigned integer 4 bit unsigned integer 8 bit unsigned integer 8 bit signed integer 16 bit unsigned integer 16 bit signed integer 32 bit unsigned integer 32 bit signed integer Single precision float Double precision float Single precision complex Double precision complex 45

Spatial Modeler The default is 1 bit unsigned integer.

Integer File Type

Enter the default file type to create for integer raster variables. The valid options are the same as those listed for the Binary File Type preference. The default is 8 bit unsigned integer.

Float File Type Enter the default file type to create for floating point raster variables. The valid options are the same as those listed for the Binary File Type preference. The default is Single precision float.

Complex File Type

Enter the default file type to create for complex raster variables. The valid options are the same as those listed for the Binary File Type preference. The default is Single precision complex.

Default to Continuous On If THEMATIC or CONTINUOUS is not specified, the modeler uses the data type to determine whether a new file should be thematic or continuous. Signed integer, float, and complex data are always continuous. For unsigned integer types, normally the smaller types, such as 1-bit, 2-bit, etc., are thematic, while you may want larger types, such as 32-bit, to default to continuous. This preference sets the minimum data type that defaults to continuous. All smaller unsigned types will default to thematic. Valid options are: 1 bit unsigned integer 2 bit unsigned integer 4 bit unsigned integer 8 bit unsigned integer 16 bit unsigned integer 32 bit unsigned integer Signed types only Signed types only implies that all unsigned integer types default to thematic. The default is 8 bit unsigned integer.

Binary Temp Type

Enter the default file type to create for temporary binary raster variables. The valid options are the same as those listed for the Binary File Type preference. The default is 1 bit unsigned integer.

Integer Temp Type Enter the default file type to create for temporary integer raster variables. The valid options are the same as those listed for the Binary File Type preference.

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Spatial Modeler The default is 32 bit signed integer.

Float Temp Type

Enter the default file type to create for temporary floating point raster variables. The valid options are the same as those listed for the Binary File Type preference. The default is Double precision float.

Complex Temp Type

Enter the default file type to create for temporary complex raster variables. The valid options are the same as those listed for the Binary File Type preference. The default is Double precision complex.

Binary Intermediate Type Enter the default file type to create for intermediate binary files. The valid options are the same as those listed for the Binary File Type preference. The default is 1 bit unsigned integer.

Integer Intermediate Type Enter the default file type to create for intermediate integer files. The valid options are the same as those listed for the Binary File Type preference. The default is 32 bit signed integer.

Float Intermediate Type

Enter the default file type to create for intermediate floating point files. The valid options are the same as those listed for the Binary File Type preference. The default is Double precision float.

Complex Intermediate Type Enter the default file type to create for intermediate complex files. The valid options are the same as those listed for the Binary File Type preference. The default is Double precision complex.

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Movie

Movie This preference affects the Movie sequence application.

Store Movie Frames In This preference specifies where the memory is allocated for the frames of a Movie sequence. When X Server is specified, all frames are stored in the X server as pixmaps. If there are a large number of frames (greater than 20), the X server could grow to a fairly large size. However, this option will provide the best performance. The Application option will allow the Movie application to store all of the frames. This option will cause the Movie to run slower, but will use less system memory. The memory preference category is used by this application when Application is selected. See the memory preference for more information. The default is X Server.

Start Movie Using Depth Specify the display depth to use for the Movie Viewer. Select default, 24-bit, or 8-bit. The default is default.

X-Windows Display Visual The preference determines the color characteristics of the screen. It is useful for systems that support multiple colormaps of different depths simultaneously. The valid options are default, PseudoColor, TrueColor, and DirectColor. The default is default.

Start Movie On Screen This preference controls on which screen Movies display. This preference is useful only with a multi-headed system (that is, on a computer with multiple CRTs that are all controlled by the same X server). The valid options are default, .0, .1, .2, and .3. The default is default.

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OrthoBASE Preferences

OrthoBASE Preferences The Preference Editor enables you to specify system defaults and set many parameters that affect the operation of OrthoBASE. Most of these preferences can be overwritten in the actual dialogs that perform the operation. These are simply the default settings that display when the process is initiated. This document describes the preferences added to the Preference Editor dialog when OrthoBASE is installed. To access them, select OrthoBASE from the Category: popup list. They are listed here in the order in which they display in the Preference Editor. Graphic Status Background Color - displays the background color for the graphic display field. The default is white. Graphic Status Footprint Color - displays the footprint color for the graphic display dialog. The default is dark gray. Graphic Status Point Color - displays the point color used by the graphic display dialog. The default is red. Graphic Status Residual Color - displays the point residual color used by the graphic display dialog. The default is cyan. Selector Icon - displays the icon used to indicate where to place a point. The default is gcp_select.icon. Selector Color - displays the color of the points selected in the Viewers. The default is green. Status On Color - displays the color used to indicate a positive status in the OrthoBASE and Point Measurement CellArrays. The default is green. Status Off Color - displays the color used to indicate a negative status in the OrthoBASE and Point Measurement CellArrays. The default is red.

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OrthoBASE Preferences Resampling Method for DEM - allows you to select either Nearest Neighbor or Bilinear as the method for resampling the DEM. The default is Bilinear.

☞ When you change any settings in a particular category, you must select File | Save To V8Preference from the Preference Editor menu bar to set those parameters before moving on to the next category.

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Profile

Profile Max Surface Width

The Maximum sample width for surface profile.

The default is 150.

Max Surface Height

The maximum surface height for surface profile.

The default is 150.

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Raster Processing

Raster Processing These preferences are used through the system to contol various aspects of raster resampling for which there is no other user interface. Most notably these will affect the way that “Reprojection on the fly” is handled in the Viewer and in the Modeler.

Reprojection X Samples Per Image - Number of X samples to use in the Raster Reprojection Approximation. The default is 25.

Reprojection Y Samples Per Image - Number of Y samples to use in the Raster Reprojection Approximation. The default is 25.

Reprojection RMS Error Tolerance - Raster Projection Approximation RMS Error Tolerance. The default is 0.1.

Reprojection Maximum Polynomial Order - Raster Reprojection Approximation Maximum Polynomial Order. The default is 2.

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Raw Image Files

Raw Image Files These preferences control the importing of raw image files.

Byte Order - Byte order of 16, 32 and 64-bit pixels. The choices are: Native - Same as native byte order of machine. MSB - Most-significant byte first (e.g. Motorola) LSB - Least-significant byte first (e.g. Intel) The default is Native.

Pixel Interleaving - Arrangement of pixels for multiband images. The choices are: BIL - Band Interleaved by Line BIP - Band Interleaved by Pixel BSQ - Band Sequential TILED - Tiled The default is BIL

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RPF Image Files

RPF Image Files Use Geographic Coordinates (Lat/Lon) - Use geographic coordinates (Lat/Lon) instead of equirectangular coordinates. The default is false.

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TIFF Image Files

TIFF Image Files 1-bit Image Compression

The “1-bit Image Compression” preference determines what type of compression is used for newly created TIFF images that represent each pixel in 1 bit. The default is None for no compression used. CCITT (1D)

Standard facsimile transmission compression adapted for disk storage.

CCITT Group 3 Standard facsimile transmission compression adapted for disk CCITT Group 4

storage.

Standard facsimile transmission compression adapted for disk.

LZW General purpose compression scheme. Requires additional license due to patent restrictions. PackBits

Simple byte oriented run-length scheme.

8-bit Image Compression The “8-bit Image Compression” preference determines what type of compression is used for newly created TIFF images that represent each pixel in more than 1 bit, but in 8 bits or less. The default is None for no compression used. LZW General purpose compression scheme. Requires additional license due to patent restrictions. PackBits Simple byte oriented run-length scheme.

Other Image Compression The “Other Image Compression” preference determines what type of compression is used for newly created TIFF images that represent each pixel in more than 8 bits. The default is None for no compression used. LZW General purpose compression scheme. Requires additional license due to patent restrictions. PackBits

Simple byte oriented run-length scheme.

Edits Allowed

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TIFF Image Files The “Edits Allowed” preference determines whether or not you can edit a TIFF file. If you allow yourself to edit TIFF files, keep in mind that any TIFF tags that are not part of the Baseline TIFF specification may be purged from the file as the TIFF specification directs. The default is false.

Create Tiled Images The “Create Tiled Images” preference determines whether newly created TIFF files will be tiled or not. Tiled images, particularly very large ones, usually perform better in a graphical environment. Note that applications that cannot handle TIFF revision 6.0 may not be able to access tiled TIFF images. If the image is not tiled, it will be stored in strips the width of the image. The default is false.

Georeferencing fallbacks The “Georeferencing fallbacks” preference allows the TIFF Resolution, Resolution units, and Orientation tags to be read (in the absence of GeoTIFF information) so that a map system based on these values can be simulated in IMAGINE. The default is true.

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Vector

Vector These preferences affect vector processing and can be overridden using the vector Options dialog. These preferences are read each time a vector coverage is displayed.

Use Node Snap Distance Enable this option to use the default node snap distance stored with the vector layer you are using. When 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. The default is false.

Use Arc Snap Distance Enable this option to use the default arc snap distance stored with the vector layer you are using. When 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. The default is false.

Use Weed Tolerance Value Enable this option to use the default weed tolerance stored with the vector layer you are using. When enabled, vertices must be at least the weed distance apart to be retained. The default is false.

Selection Method Indicate how features will be selected when using the marquee tools in the Vector Tools dialog. You can either select all features that intersect the marquee or select only those features that are completely contained within the marquee. The valid options are intersect and contained_in. The default is intersect.

Scratch File Directory Specify a directory to which IMAGINE can write temporary files during an editing session, or other processing for which a significant amount of temporary files will be generated (e.g.importing TIGER, or clean). These files have a prefix of "xx" and are automatically removed after the processing is finished. The default scratch file directory is your IMAGINE startup directory.

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Viewer

Viewer These preferences affect the Viewer.

New View Windows Appear On Under UNIX this preference controls on which screen the ERDAS IMAGINE Viewers display. It does not affect where the icon panel or dialogs display. This preference is useful only with a multi-headed system (that is, on a computer with multiple CRTs that are all controlled by the same X server). The ERDAS IMAGINE icon panel is opened on the default screen, which is usually the CRT where IMAGINE was started. By using this preference, the IMAGINE Viewer can be told to start on another screen (or by default the same screen as the icon panel). The valid options are default, .0, .1, .2, and .3. The default is default.

Display Card Depth Under UNIX this preference tells the IMAGINE Viewer what display depth it should use when displaying images. It is useful only on displays that support multiple depths. For example, most 24-bit cards support 8-bit depth as well as 24-bit depth. This preference is used primarily on systems that support multiple hardware colormaps of different depths simultaneously, in which case it is best to start the window system with an 8-bit PseudoColor visual and tell the IMAGINE Viewer to use a 24-bit DirectColor visual. The valid options are default, 8, 12, and 24. The default is default.

X-Windows Display Visual

Under UNIX the preference works in conjunction with the previous one, Display Card Depth, to determine the color characteristics of the screen. It is useful for systems that support multiple colormaps of different depths simultaneously. The valid options are default by depth, default visual, PseudoColor, TrueColor, and DirectColor. The default by depth option causes the IMAGINE Viewer to choose which visual to use based upon the depth specified by the Display Card Depth preference above. The option default visual causes the windowing system default visual to be used. The other three options explicitly declare what type of visual to use. The default is default by depth.

Use Private Colormap Under Unix this preference, when enabled, tells the IMAGINE Viewer to use a virtual colormap. When using a virtual colormap, the colors on the screen will shift whenever an image window is entered or exited by the mouse. This preference is used to allow other programs to gain access to colors when they cannot get the colors in any other way. This preference can also be used to assure that IMAGINE gets as many colors as possible.

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Viewer The default is false.

Tool Palette Size Specify whether to use small or big tool palettes for annotation, AOI, vector, Model Maker and other tools. The default is small.

Combine Tools and Commands Specify whether to include command icons in tool palettes. The default is false.

Automatically Show Tool Palette Specify whether to automatically show tool palette when creating a new Annotation or Vector Layer, or Map Composition. The default is true.

Default Break Point Directory

Enter the default directory to be used by the Contrast

Librarian. The default is ‘.’.

Default Symbology File

When you display a vector layer, you have the option to use a symbology file (.evs extension). If an associated .evs file does not exist, then you can use the Choose Symbology dialog to specify an .evs file. This preference is used to define the default symbology file for the Choose Symbology and Open Vector Layer dialogs. There is no default.

Allow server to do polygon fill Under UNIX indicate whether you want filled annotation objects and vector polygons/attributes to be filled using fill functions in the X Server or the ERDAS IMAGINE C Programmers’ Toolkit fill algorithm. In general, the server fill is faster but the IMAGINE fill does a better job. If your annotation/vector text on the screen seems to be missing pixels, or if you experience problems with filled polygons, try setting this preference to no. The default is yes.

Default Viewer X Size This preference, in conjunction with the Default Viewer Y Size preference, determines the size of the IMAGINE Viewer window when it first is opened after IMAGINE is started and when you click the Start Viewer icon on the icon panel. The default is 512.000.

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Viewer

Default Viewer Y Size

This preference, in conjunction with the Default Viewer X Size preference, determines the size of the IMAGINE Viewer window when it first is opened after IMAGINE is started and when you click the Start Viewer icon on the icon panel. The default is 512.000.

Clear Display The preference determines the default method in which a new file is added into a Viewer. If enabled, the Viewer clears a window before loading a new file for viewing. If disabled, the Viewer does not, by default, clear the window when a new image is loaded. If the Viewer window is not cleared when a new image is loaded, the old image may be completely obscured by the new one (i.e., you cannot see it to know it is there). When both images are in the Viewer, each will require colorcells (a valuable resource with an 8-bit visual), and each image will need to be redrawn whenever one of them needs to be redrawn (scrolling to a new region of the image, scaling, changing resampling methods, etc.). The default is yes. It is highly recommended that this preference be enabled (the default).

Annotation Clear Display

This preference performs the same task as the Clear Display preference, but with a slight difference. It applies only to the default option of how annotation layers are added to a Viewer window. Annotation layers are typically loaded on top of images, and do not obscure the underlying image. The default is no. It is recommended that you accept the default of no due to the unique nature of annotation layers.

Show Menu Bar

This preference controls whether or not a menu bar is displayed in a new Viewer window by default (the right mouse button menu, the Quick View menu, in the Viewer will let you override this option). It is recommended that you leave this preference enabled. The default is yes.

Show Scroll Bars

This preference controls whether or not scroll bars are displayed in a new Viewer by default (the right mouse button menu, the Quick View menu, in the Viewer will let you override this option). It is recommended that you leave this preference enabled. The default is yes.

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Viewer

Show Borders Establish whether to make window manager borders visible on viewer startup. The default is yes.

Show Tool Bar This preference controls whether or not the tool bar is displayed in a new Viewer by default (the right mouse button menu, the Quick View menu, in the Viewer will let you override this option). It is recommended that you leave this preference enabled. The default is yes.

Show Status Bar This preference controls whether or not the status bar is displayed in a new Viewer by default (the right mouse button menu, the Quick View menu, in the Viewer will let you override this option). It is recommended that you leave this preference enabled. The default is yes.

Maximum X Backing Store

This preference, in conjunction with the Maximum Y Backing Store, determines the maximum size of a Viewer and the width of the part of the image that can be scrolled back and forth quickly. A larger value will provide a larger horizontal area that can be scrolled back and forth quickly. A larger value also requires more system memory. A smaller value than the screen’s width will limit the size to which a Viewer can be stretched. The default is 1280.000.

Maximum Y Backing Store

This preference controls the same behavior as the Maximum X Backing Store, except that it affects the vertical component of the Viewer. The default is 1024.000.

Render Outside of View Views will be drawn to the maximum backing store when they are displayed for quick scrolling. This option requires large amounts of memory if your Maximum X and Y Backing Stores are large. The default is no.

Use Image Block Size for Rendering This preference determines what tile size to use for rendering. You should leave it set to no unless you are consistently displaying very large files (greater then 10,000 pixels in width or height). For these files, setting this option to yes will speed up rendering. The block size in the file is used as the tile size in the Viewer. The default is no.

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Viewer

Polyline/Polygon termination button

Specify whether to terminate polygons and

polylines with a middle-click or a double-click. The default is middle.

Move Mouse on Zoom

This preference controls whether or not the cursor will stay in the same location when you zoom an image. The default is false.

Automatically Display Properties This preference controls whether the properties dialogs for annotation are automatically opened when an annotation element is selected. The default is no.

Histogram Tool Layout Specify whether the Histogram Tool should be vertical or horizontal. The default is vertical.

Use Transparency in Swipe/Flicker Tools for: Specify whether the top layer should be transparent. When this option is enabled, the top layer will be modified without affecting the other layer, no matter how they are overlaid or what type of clipping they have. Depending upon your operating system, this options can be slow depending on the size of your Viewer. When this preference is disabled, the top layer will completely cover all other layers whether they are inside or outside the extent of the top layer. All areas that use opacity will become black. This option is used only if the layers completely overlay each other and there is no opacity. The default is yes.

Use Fast Selectors: (UNIX only) When this preference is enabled (the default), selected elements may be less visible in the viewer but also require less memory. When this preference is disabled, selected elements may be more visible in the viewer but you may run out of memory if many elements are selected as with a Select All operation in a CellArray. The default is yes (enabled).

North Arrow Select the style of the default North arrow. The options are: 1 (North Arrow 1)

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Viewer 2 (North Arrow 2) 3 (North Arrow 3) 4 (North Arrow 4) 5 (North Arrow 5) 6 (North Arrow 6) The default is 1.

Pixel Size of North Arrow Set the default size of the North arrow in pixels. The acceptable range is 10 to 500. The default is 50.0.

Pixel Size of Scale Bar Set the default size of the scale bar in pixels. The acceptable range is 10 to 500. The default is 50.0.

Show Coordinates As Set the default viewer coordinate system. The options are Map or Lat/Lon. The default is Map.

Inquire Cursor/Box Color Select the default color for the inquire cursor and the inquire box. The default is white (255, 255, 255).

Enable Animated Zoom Enable the animated zoom feature. When enabled, this feature animates the zoom in by 2 or zoom out by 2 functions

and

.

Under PC the default is enabled (checked). Under UNIX the default is disabled (not checked).

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Viewer

Enable Box Zoom Enable the zoom to/from box feature. When enabled, this feature allows you to drag a box inside the viewer that is used as the boundary for zooming. When the Zoom In Re-center tool

is selected and a box is dragged, the image bounded by the

box is enlarged to fit within the current viewer. When the Zoom Out Re-center tool is selected and a box is dragged, the image is reduced so that the area currently displayed in the viewer fits within the box. The default is enabled (checked).

Hide Cursor on Inquire By default, the mouse cursor is hidden while the inquire cursor is moved. Under certain conditions, you may want to see the position of the mouse cursor as you as you move the inquire cursor. In these cases, set this preference to false (unchecked). The default is true (checked).

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Viewshed Analysis

Viewshed Analysis These preferences affect the default values and colors to use with the Viewshed Analysis Tool.

Output Type - displays the type of viewshed analysis to appear when you start the Viewshed Analysis Tool. The default is Single Viewshed.

Position Units - displays the units for positioning an observer in the image displayed in the Viewer. The default is Meters.

Height Units - displays the height units for the terrain elevation of the image displayed in the Viewer. The default is Meters.

Distance Units - displays the units used for the maximum height within a viewshed area and for the range of the viewshed. The default is Meters.

Maxima Search - allows you to set the observer so it automatically jumps to the highest point within the viewshed area where you have placed the marker. The default is 0.000.

Spokes - allows you set the number of spokes to extend from the center of the viewshed area. They will be spread over the full 360 degrees of the circle. The default is 0.000.

Use Earth Curvature - allows you to set whether or not to use the curve of the Earth into account when making calculations. The default is off.

Number of Intervals - displays the number of divisions between heights when using AGL or ASL output types. The default is 5.000.

Interval Height - displays the elevation of each interval when using AGL or ASL output types. The default is 100.000.

Starting Elevation - displays the base elevation for the intervals of height used with AGL or ASL output types. The default is 0.000.

Observer AGL Height - displays the distance above average ground level of the observer. The default is 30.000.

Observer Maximum Range - displays the range of the viewshed analysis area. The default is 2000.000.

Observer Azimuth - displays the observer’s angle, around which the field of view is drawn. The default is 0.000.

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Viewshed Analysis

Observer View Cone - displays the observer’s field of view within the viewshed area. The default is 360.000.

Maximum Number of Intervals - displays the maximum number of intervals of height when using ASL or AGL output types. The default is the maximum, 40.000.

Maximum Number of Observers - displays the maximum number of observers to be used in a viewshed layer using Multiple Viewsheds output type. The default is 40.000.

Out of Bounds Value - displays the distance outside of the image to calculate when creating a viewshed layer near the edge of an image. The default is 0.000.

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VirtualGIS

VirtualGIS These preferences affect the default values, colors, and viewing preferences for the VirtualGIS window.

New Windows Appear On - defines the screen on which the VirtualGIS window is displayed. The default is default, so the window is displayed on the screen where IMAGINE is displayed.

Navigation Mode — sets the default mode of movement for VirtualGIS. The default is position.

Use Backing Store — allows only the part of the scene obstructed, such as by a menu, to be refreshed when the obstruction is removed. On faster graphics systems, this preference should be turned off. The default is off.

Collision Detection — prevents collisions with the terrain while navigating through VirtualGIS. The performance of VirtualGIS is increased when this preference is off. This option can be changed in the Scene Properties dialog. The default is on.

Update From Eye-Target Selector — allows you to select whether to update a VirtualGIS scene when the Eye-Target selector in the IMAGINE Viewer is released or when you select View | Update Display. The default is onupdate.

Eye/Target Colors — specifies the color of the Eye-Target selector displayed in an IMAGINE Viewer linked to VirtualGIS. The default is red.

Default Symbology File — allows you to enter the default symbology path and file to use when displaying vector coverages. There is no default.

Show Coordinates As — specifies what type of coordinates to use when the observer’s position is displayed in the Position Editor, the Position Recorder, and the Flight Path Editor. The default is Map.

Color of Saved Positions in Recorder — specifies the color of the position markers displayed in VirtualGIS when saved in the Positions Recorder. The default is red.

Color of Flight Path — specifies the color of the flight path line displayed in VirtualGIS when created in the Flight Path Editor. The default is red.

Always Render Elevation Model — allows you to select whether or not the DEM is always visible under raster layers in VirtualGIS. This option can be changed in the Scene Properties dialog. The default is off.

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VirtualGIS

Heads-Up-Display Color — specifies the color to be used with the Heads Up Display in VirtualGIS. The default is red.

Background Display Type — specifies the default background for display behind a VirtualGIS scene. The default is solid. Solid Background Color — specifies the color to be used when a solid background is selected. The default is black.

Faded Background Start Color — specifies the color to use at the horizon when a faded background is selected. The default is white. Faded Background End Color — specifies the color to use above the horizon when a faded background is selected. The default is light blue.

Faded Background Ground Color — specifies the color to use for the ground color when a faded background is selected. The default is dark green.

Use Ground Color in Faded Background — allows you to select whether to use a ground color when using a faded background. The default is off.

Fade Ground Color Into Horizon — allows you to select whether to fade the selected ground color into the horizon when using a faded background. The default is on. Faded Background Range (in Degrees) — allows you to select the range to use with a faded background. The default is 20 degrees.

Image Background Filename — allows you to enter the default .img file to use when displaying the background with an image. There is no default.

Invert Movies on NT — allows you to automatically counteract when AVI movies created on Windows NT display upside down. The default is on.

Invert Movies on 95 — allows you to automatically counteract when AVI movies created on Windows 95 display upside down. The default is off.

Allow Stretched Scene — allows you to change the size of your VirtualGIS window without warping your 3D scene. The default is off.

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Imagery in VirtualGIS 8.4 and later may appear to have a different exaggeration than the same imagery in VirtualGIS 8.3 and earlier because VirtualGIS no longer stretchs the scene to fit the VirtualGIS Viewer by default. Turn on the Allow Stretched Scene preference if you prefer to stretch the scene to fit in the VirtualGIS Viewer by default.

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VirtualGIS

Distance from Point to Seek — allows you to select how far away from the selected point to move in units when using the Move To Selected options. The default is 300.

Percentage of Distance to Seek — allows you to select how far to move by percentage of distance toward the selected point when using the Move To Selected options. The default is 75.

Seek Using Distance — allows you to specify to use distance units (rather than percentage of distance) when using the Move To Selected options. The default is off. Intervisibility Observer Range — allows you set the default viewing distance for an observer in file pixels. The observer’s intervisibility dome will be this size. The default is 200.

Intervisibility Observer Size — allows you to set the default size in file pixels of observers when they are added to a scene. The size is rendered in whole file pixels, based on the resolution of the DEM. The default is 20.

Intervisibility Dome Density — allows you to set the density of the dome’s wire frame when using the Both or Wire Frame options to display the dome. The default is 100.

Report Motion Performance Information — allows you to select whether or not the number of frames generated and the time to create those frames are displayed in the IMAGINE Session Log after completing a flight through a VirtualGIS scene. The number of frames per second possible on a system can be calculated with these numbers. The default is off.

Raster Tiling Quality — defines the quality of the seams between the tiled segments of a Virtual World displayed in a VirtualGIS scene. The higher the quality, the lower the rendering speed. The default is Best.

Allow Color Fallback Mode — allows you use Color Shaded Fallback mode. This option will increase the memory usage of VirtualGIS. If memory consumption is a concern, or you will not be using fallback modes, then this preference should be turned off. The default is on.

Use Multi-Threading — allows you to specify whether or not VirtualGIS uses multiple threads to handle the file I/O and graphics I/O separately. The default is on.

Use Display List Rendering — allows an increase in rendering speed for singleresolution scenes, i.e. all displays that are not Virtual Worlds. The default is off.

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VirtualGIS

Resample Textures Using — allows you select whether to resample the images loaded into VirtualGIS with Bilinear interpolation or Nearest Neighbor interpolation. On some systems, Nearest Neighbor will resample faster, but degrade the quality of the imagery. The default is Bilinear.

Vector Line Width — defines the width of vectors displayed in VirtualGIS. The smaller the line width, the lower the visual quality of the vector when displayed. The default is 2.000.

Use Texture Mipmapping — allows VirtualGIS to create multiple levels of detail for imagery. This preference enhances the visual quality of the display, but increases the amount of memory used for rendering. The default is off.

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When using the Texture Mipmapping preference with Virtual Worlds, the imagery may show some black areas around the edge of the image. If this occurs, disable the Texture Mipmapping preference.

Use Stencil Buffer For Draping — allows rendering of draped lines and polygons with a stencil buffer. For systems that support stencil buffers, the visual quality of the rendered lines and polygons is improved. This preference is useful when used with the Polygon Offset preferences. The default is on.

Use Polygon Offset For Draping — allows rendering of draped lines and polygons with the offset feature of OpenGL. For systems that support the polygon offset feature, the visual quality of the rendered lines and polygons is improved. However, on some systems, this preference can reduce performance. This preference is useful when used with the Stencil Buffer preference, and the other Polygon Offset preferences. The default is on.

Polygon Offset Factor — applies a depth exaggeration factor to draped data based upon each object’s orientation and distance. This value should be negative to reduce the depth of the object. This preference works well with the Polygon Offset Bias Units preference. The default is -10.000.

Polygon Offset Bias Units — adds to the offset factor in terms of the binning of the depth buffer to handle round-off errors inherent in graphics hardware devices that use a lower resolution for representing depth values.This value should be negative to reduce the depth of the object. This preference works well with the Polygon Offset Factor preference. The default is -5.000. Use Elevation Angle LOD — allows VirtualGIS to use lower resolutions of the terrain when viewing Virtual Worlds from an orthogonal direction. This preference increases performance. The default is off.

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VirtualGIS

Maximum Allowed Elevation Error — allows you to set the elevation error allowed when viewing a Virtual World. The higher the elevation error, the better the performance. However, a high elevation error also degrades the visual quality of the DEM. The default is 3.000.

Disable Extensions — allows you to enable or disable VirtualGIS to use some OpenGL extensions (the preferences listed below). Not all systems will support all extensions. This preference checkbox disables all the preferences below it. The default is off.

Use Texture Object Extension — an OpenGL extension, this allows VirtualGIS to index into the graphic cards’ texture memory. When supported by the system, this preference can increase performance. It can be disabled individually, or with the Disable Extensions preference. The default is on.

Use Four Bit Texture Extension — an OpenGL extension, this allows VirtualGIS to use four bits per RGB. The resulting image uses fewer colors than normal eight-bit images. It also uses less texture memory, and could increase performance. It can be disabled individually, or with the Disable Extensions preference. The default is off.

Use Multi-Sampling Extension — an OpenGL extension, this allows the removal of aliasing artifacts in the imagery when moving through a VirtualGIS scene. It is typically only supported by graphics-oriented machines. It can be disabled individually, or with the Disable Extensions preference. The default is off.

Use Color Table Extension — an OpenGL extension, this allows Contrast Tools in VirtualGIS to automatically affect images with the AutoApply enabled. It can be disabled individually, or with the Disable Extensions preference. The default is off.

Use Filtering Extension — an OpenGL extension, this allows the process of applying convolution filters to VirtualGIS images to be optimized. It can be disabled individually, or with the Disable Extension preference. The default is off.

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Virtual World Editor

Virtual World Editor These preferences affect the default colors used with the Sector View Tool in the Virtual World Editor.

Sector View Background Color - displays the color to use for the background in the Sector View Tool. The default is black.

Sector View Grid Color - displays the color to use for the grid in the Sector View Tool. The default is dark green.

Sector View Text Color - displays the color to use for the text in the Sector View Tool. The default is black.

Sector View Uncomputable Color - displays the color to use for the uncomputable areas of data in the Sector View Tool. The default is light yellow.

Sector View Sector Color - displays the color to use for a single sector in the Sector View Tool. The default is gray.

Sector View Selected Sector Color - displays the color to use for a single selected sector in the Sector View Tool. The default is gold.

Sector View DEM Color - displays the color to use for the DEMs in the Sector View Tool. The default is bright green.

Sector View Selected DEM Color - displays the color to use for a selected DEM in the Sector View Tool. The default is chartreuse.

Sector View Raster Overlay Color - displays the color to use for the raster overlays in the Sector View Tool.

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Virtual World Editor The default is slate blue.

Sector View Selected Raster Overlay Color - displays the color to use for selected raster overlays in the Sector View Tool. The default is light tan.

Sector View Vector Color - displays the color to use for the vector layers in the Sector View Tool. The default is hot pink.

Sector View Selected Vector Color - displays the color to use for a selected vector layer in the Sector View Tool. The default is dark tan.

Sector View Annotation Color - displays the color to use for the annotation layers in the Sector View Tool. The default is turquoise.

Sector View Selected Annotation Color - displays the color to use for selected annotation layers in the Sector View Tool. The default is dark yellow.

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