Digital elevation models

Digital Terrain Models (DTM)

Digital terrain models (DTM) describe natural landforms of the surface of the earth by digitally, numerically storing height informations. In contrast to digital surface models (DSM), a DTM does not depict objects on the surface of the earth (e.g. trees and houses). Our models achieve a precision in the single-digit centimetre range. The position accuracy of the models is guaranteed by applying ground control points with a RTK GNSSS-system. Georeferenced terrain models may be delivered in different common file formats (e.g. Raster, TIN, ASCII) and spatial frameworks. Upon request, we are happy to integrate our high-precision terrain models into freely available terrain models (SRTM, Aster).

Applied methods

We calculate a dense pointcloud by photogrammetrical methods from a series of vertically and oblique taken aerial images. terrain points contained within the dense pointcloud is the basis of the digital terrain models, which describes the shape of the terrain surface without vegetation or buildings. Our photogrammetric evaluation process fulfills the highest requirements regarding quality as well as precision. Besides calibrated camera systems, we have a specialised IT infrastructure, which enables us to process large amounts of data swiftly and efficiently.

Possible applications for DTMs

  • environmentalism (e.g. generation of noise immission maps, flood simulations)
  • mining (e.g. volume calculation)
  • simulation and forecasts (flood control, noise calculations, ground motion, nature and groundwater protection,  visibility analysis)
  • construction measures
  • traffic planning (e.g. track planning, profile display)
  • tele- and mobile communication
  • energy supply (e.g. planning of wind turbines)
  • solar radiation analysis
  • spatial planning
  • 3D-visualisation
  • archeology

  • Digitales Geländemodell eines abgedeckten Bunkers bei Aachen (NRW) mit Konturlinien.