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A DEM is an ordered array of elevation relatives to a
datum, and referenced to Geographic coordinate system. A Digital Terrain
Model (DTM) provides similar information for ground features only
(Terrain).
Services using DEM :
- Ortho - rectification
of images for use in CAD / GIS systems
- Producing
3D base maps for Resource / Mapping and Infrastructure
- Optimum
alignment (Pipeline / Rail / Road /Canal) surveys
- Corridor
route planning
- Terrain
studies analysis
- Subsidence
and erosion monitoring
- Defence
applications
- Flight
simulation training
- Urban
planning from terrain modeling
- Water
shed management
- Slope map
- Tower
site location
- Linear
network extraction / updating (Rivers / lakes, roads , railways,
coast line, pipeline, drainage)
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DEM'S are supplied by TriCAD produced from IRS 1C -
1D, Landsat, Spot, Radarsat, Airphoto Sterio Imagery with less turn
around time and greater accuracy.
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