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Digital Terrain Model
Digital Terrain Model (DTM) is a bare earth model that is generated using stereo pair of imageries. Such models become an integral part of topographic surveys. These models are also used to generate contour maps. Such models are the best depiction of slopes and aspects. Digital Terrain Models (DTM) sometimes called Digital Elevation Models (DEM) is a topographic models of the bare Earth that can be manipulated by computer programs. The data files contain the elevation data of the terrain in a digital format that relates to a rectangular grid. Vegetation, buildings, and other cultural features are removed digitally – leaving just the underlying terrain.
- Next-generation global 3D terrain datasets
- Seamless data up to sub-meter post spacing
- Precise topographic analysis
- Comprehensive worldwide offering
- Hydro-enforced – water bodies and coastlines are flattened for accurate measurement
- Vintage: most recent or new collected imagery
- File format: GeoTIFF or other formats on request
- Post Spacing: 50cm to 10m
- Stereo remote sensing imagery
- Ground Control Points (GCPs).
- Contours
- Triangulate Irregular Network (TIN).
- Absolute: 50cm to 5m (LE90)
- Valid on all-terrain type
DTM is a measurement of how precise the elevation at each pixel is (absolute accuracy) and how precisely the morphology is presented (relative accuracy). So many factors have an impact on the quality of DTM:
- Terrain roughness
- Extracting terrain parameters
- Sampling density (elevation data collection method)
- Grid resolution or pixel size
- Interpolation algorithm
- Vertical resolution
- Terrain analysis algorithm
- Rendering of 3D visualizations