Feb1204gdbpanel Muni

Core Layers Status Report Alaska Surveying & Mapping Conference

Charlie Barnwell GIS Manager Municipality of Anchorage February 12, 2004

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Municipality of Anchorage

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What is a Core Layer? •

The National Spatial Data Infrastructure (NSDI) framework data concept establishes a collaborative effort in which commonly needed data themes are developed, maintained, and integrated by public and private organizations. Sharing framework data helps to reduce operating costs and to improve service and decision making. NSDI Framework layers are categorized as follows: – orthoimagery, – elevation and bathymetry, – hydrography, – transportation, – government units, – geodetic control, and – cadastral data.

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The Municipality uses the NSDI framework concept and defines core layers as follows: – Data that is multi-departmental in use and can be used in a variety of Municipal operations. – Data that is essential to mission critical operations, e.g. Public safety dispatch systems. – Reference source for accurately registering and compiling departments own data sets. – Geo-referenced layer for adding attributes, and displaying the locations and the results of analysis of other data.

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Why MOA Core Layers  Digital datasets are not always easily accessible and are produced in a variety of formats  Data may not align with one another over an area or across jurisdictional boundaries  We need a focused effort on updating the important (core) layers. Most maps are not up-to-date: easements for example are out of date; trails was last done in 1996; land use in 1998.  Cost: over $1 million citywide to recreate data 4

MOA Core Layers

Framework Layers

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OA Core Layers : Data Characteristics • Seamless; • Consistently classified with FGDC metadata; • Variable resolution, completeness; • Current to within seven days; • Variable positional accuracy, but 9-11 study in bowl indicates average seven (7) foot. 6

“Hot” Core Layers: elevation LIDAR (Light Detection And Ranging)

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“Hot” Core Layers: elevation

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“Hot” Core Layers: orthoimagery Benefits • High resolution: serves large variety of needs • Improve base map accuracy • Very little vertical exaggeration • Matches survey control 9

Other Core Layers: parcels, subdivisions, other

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Business Case/Motivators • $1 million to recreate; • Avoid asking taxpayers to pay for data multiple times; • Enhanced responsiveness to data requests; • Source for consistent data for Anchorage area; • Use of local data in local decision-making • 9-11; • Planning, permitting, utilities, etc., etc.

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OA Core Layers : Access and Use • Around-the-clock Internet access; • User-specified combinations of data and geographic area; • Public domain, public access—FGDC Clearinghouse node; • External and Internal

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MOA Core Layers Web Viewer http://www.muni.org

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MOA Core Layers Web Viewer http://www.muni.org

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MOA Core Layers: Management Approach

Problem

Digital datasets are not always easily accessible and are produced in a variety of formats

Solution RDBMS

Data may not align with one Same projection, datum, etc. another over an area or across jurisdictional boundaries Most maps are not up-to-date

Regular updates on base framework layers, e.g. imagery every two years.

Cost: over $1 billion citywide Enterprise layers used by all to recreate data agencies. Eliminate redundant layer creation, maintenance. 15

MOA Core Layers: Management Approach

Spatial Indexing

Spatial Data Types

RDBMS All Spatial Data Stored in the Database

Fast Access to Spatial Data

Spatial Access Through SQL SELECT facility FROM facility_geom WHERE RELATE (‘facility’, sdo_gid, ‘INSIDE’, ‘com_area’, 100) = ‘INSIDE’;

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More About MOA Core Layers at: You can access information at http://www.muni.org Comments and questions about MOA Core Layers should be e-mailed to [email protected]

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