City Models
  TopoSys laserscanner data and image data are admirably suited for accurate 3D city models. Building heights and ground plans are accurately determined in position and elevation and hence form the basis for a wide variety of town planning requirements.
 

3D view DSM with RGB superimposed, center of Venice
© CGR, Italy
 

DSM, RGB and CIR Koblenz
© BfG, Germany

 The potential fields of application for 3D city models are manifold:
  • Mapping of buildings and their heights
  • Simulation of new buildings
  • Updating and keeping cadastral data
  • Sound propagation and noise control
  • Tourism
  • Tree registers
  • Radio network planning
  • Sealed and non-sealed surface inventories
  • Simulation of waste water flows
  • Superimposition with georeferenced information in a GIS

  The different reflection of vegetation and non-vegetation in the red and near infrared spectrum allows sealed and non-sealed surfaces to be differentiated in the RGB and CIR true ortho images. The proportion of sealed surface is a decisive factor for municipal waste water charges and can be determined by a wide-area airborne scanner without time-consuming on-site inspections.

CIR and vegetation mask Friedrichshafen
© TopoSys, Germany
  3D models are coming into increasing use in town planning. A virtual tour through the town from one’s own PC is possible. The generation of a 3D city model is based on the conversion of raster laserscanner data into vector data to generate 3D block models and roof forms. Facade textures or true ortho images in true color are also superimposed on the models for photorealistic representations and visualizations.
 

raster model -----------------> block model ------------------> roof model-------------------> textur
 

An overview of the subject is given by the City Models and Urban Planning application flyer for download.


Print version