Digital Terrain Model

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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

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• How the product is unique?
• 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

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• Inputs Required
• Stereo remote sensing imagery
• Ground Control Points (GCPs).
• Contours
• Triangulate Irregular Network (TIN).

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Workflow
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Accuracy

• Absolute 50cm to 5m (LE90)
• Valid on all-terrain type
• Quality of the DTM
• DTM is a measurement of how precise the elevation
  at each pixel is (absolute accuracy) and h

• 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

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Add-on layers (feature extraction)
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• Application
• DTMs are used especially in civil engineering,
  geodesy surveying, geophysics, geography,
• Hydrology modeling
• Flood analysis
• Irrigation
• Feasibility study in infrastructure projects
• An essential part of a topographic survey
• Volume estimation in mining
• Input for orthorectification and many other