3D Terrain Models

Depending on type of use Digital Terrain Models are created for different areas of application in various data format and resolution stages (LOD - Level of Detail).

The following data are used as source material to create a DTM:

  • Elevation grid (raster):
    laser scanning, aerial photogrammetry (autom./manual)
  • Breaklines:
    aerial photogrammetry (interaktive, semi automatic)
  • Texture:
    aerial photographs - orthophotos


DTM for 3D City Models

Data reduction is very important for the presentation of 3D City Models. Thus from the source points a triangulated net (TIN - Triangulated Irregular Network) will be calculated .
This step reduces the amount of data substantially and accelerates also the visualisation.
Various LODs' can be created by interpolation of different height gradations.

90% Recognition Rate Modeling the State of North Rhine Westphalia in LOD2

A project to produce a complete dataset of building models in LOD2 for the State of North Rhine Westphalia, has been completed for Geobasis NRW (district government Cologne) together with our partner M.O.S.S. Computer Grafik Systeme GmbH. The data were produced fully automatically with novaFACTORY 3D Pro and tridicon® CityModeller. The completed LOD2 data were accepted in the desired quality and with a recognition rate of 90%.

Our expertise for your projects

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