A Digital Elevation Model (DEM) is a continuous 3D representation of a terrain surface area that has been geometrically corrected, so it can be used to measure distances and heights. Two main kinds of DEM can be generated:
  • Digital Terrain Model (DTM): 3D representation of the terrain base surface without vegetation and artificial objects.
  • Digital Surface Model (DSM): 3D representation of all elements in the area.
CATUAV systems generate a DTM in every flight as a product of the rectification process. From this previous DTM, with more intensive software procedures, a dense Point Cloud 3D model can be generated, from which a high resolution DSM can be derived.


Main features of CATUAV DEM are:

  • Resolution from 10 cm/pixel to 2 m/pixel.
  • Areas of up to 1000 hectares per flight.
  • One week delivery: the time from UAV takeoff to DEM delivery is less than a week.
  • Delivered in any desired industry standard format.
  • Manual Control Points can be added to allow comparisons with any previous work.




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Obtaining in the same flight an orthophoto plus a DEM, provides a high quality and low cost product than can be used to support any topography and cartography work. With further processing, dense Point Cloud and DSM can also be obtained, which leads to applications in multiple fields:
  • Topography.
  • Mining.
  • Forestry management.
  • Civil Works.
  • Geology.
  • More...