Laser scanner data and image data in combination enable the generation of accurate 3D city models. Building heights and ground plans are accurately determined in position and elevation and hence satisfy a wide variety of city planning requirements.
3D view DSM with RGB superimposed, center of Venice
© CGR, Italy
DSM, RGB and CIR Koblenz
© BfG, Germany
The many potential fields of application for 3D city models include:
- Mapping of buildings and their heights
- Simulation of new buildings
- Updating cadastral data
- Sound propagation and noise control
- Tree registers
- Radio network planning
- Porous and non-porous surface inventories
- Simulation of waste water flows
- Superimposition with georeferenced information in a GIS
Different reflections of vegetation and non-vegetation in the red and near-infrared spectrum allow porous and non-porous surfaces to be differentiated in RGB and CIR true ortho images. The proportion of porous surface is a decisive factor for municipal wastewater charges and can be determined by an 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 computer is possible. The generation of a 3D city model is based on the conversion of raster laser scanner 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.
Step 1: Raster ModelStep 2: Block Model Step 3: Roof Model Step 4: Textured Model