Digital Elevation Models (DEMs)

A DEM is a generic term for both a Digital Surface Model (DSM) or a Digital Terrain Model (DTM).

In the main, Landgate DEMs are edited DSMs that remove the majority of buildings and trees to create pseudo-DTMs.

Our DEM datasets have been derived from a range of capture resolutions. They are generated in the creation of ortho-mosaics undertaken as part of the annual digital imagery capture program.

Reduced grid spacing DEM (1 or 2m ‘postings’) are typically available in the higher resolution captures over populated areas, but the majority of the state exists as 5m grid postings.

DEM data can be used for:

• rectification of aerial imagery
• surface analysis
• ingestion into GIS to provide elevation data
• production of relief maps
• 3D visualisation
• water flow analysis
• line of sight analysis.

Coverage

DEM coverage is available across approximately 80% of the state.

Sample data

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Landgate South West Digital Terrain Model

Landgate also has a complete, current, and seamless Digital Elevation Model (DTM) covering the South West region of Western Australia.

Contemporary technologies and processing techniques utilised in the production of the South West DTM have afforded significant improvements when compared to the previous DTM produced over the area, including:

• 4x more data @ 5m grid intervals
• greatly improved accuracy with 97% of points falling within ± 1m
• seamless data between capture projects.

Supply format

ASCII or BIL (Band Interleaved by Line)

Purchase data today

The quickest and easiest way to purchase data is to fill out and return a completed request form by clicking the order now button below. We will provide you with a quote before we extract and deliver the data.

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Digital data extracts are subject to extraction and data costs. DEM extraction costs can vary based on factors such as extent and complexity. Please complete and return a request form for a formal quote.

Please see Licensing for conditions of use.