DTM (digital terrain model DTM; digital elevation model, DEM; Digital Terrain Elevation Data, DTED) is a digital representation of terrain's surface as a continuous object, which describes the terrain's surface with a certain accuracy. A DTM can be represented as a raster or as a regular grid of preset sized cells.
Digital terrain model is a plurality of points with known geodetic coordinates and a rule of height definition of all other points, which are not included into the plurality. Points with known geodetic coordinates are called ground control points (GCP).The rule of height definition is called the rule of interpolation. Methods of DTM generation differ by schemes of GCPs' location and by interpolation algorithms of the intervals between GCPs.

Data on the relief can be collected from geodetic survey or remote sensing, as well as from cartometric works. Thus, there are different ways of setting these data:
  • with regular location of points on rectangular, triangular and hexagonal grids, which were brought from tacheometric survey or from levelling
  • with irregular location of points along structure lines, which were brought from cartometric works
  • with isolinear location of points, which was brought e.g. from contour line vectorization
The way of setting the initial data about the relief, its detailization and accuracy define the way of interpolation and extrapolation within the area of interest. This also defines the reliability of a generated DTM.

Common uses of DTMs:
  • mapping
  • water flow or mass movement modeling
  • transport infrastructure planning
  • geographic information systems (GIS)
  • navigation
For cost calculation of DTM generation for your area of interest, send technical description of your proposal to: innoter@innoter.com. For consultations contact by the phone: +7 495 245-04-24
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