3.1 Integration of Geodata
In general two types of geodata are distinguished: raster data and vector
data. Both data types can be integrated into the 3D city model by draping
them over the digital terrain model (e.g., Döllner 2005). Besides this
method, further methods for the integration of vector data exist, such as
visualizing point features as 3D symbols or extruding polygons to 3D
blocks. The methods and workflow applied for the integration of geodata
are described for exemplary geodata sets.
3.1.1 Integration of Data on Protected Areas
Data on protected areas for nature conservation or groundwater protection
are stored as geo-vector data in the environmental department of the city
administration of Potsdam. The attribute tables hold information on the
protection status, the name of the protected area, the date of designation,
the legal basis for the designation, and more. Figure 1 depicts three approaches
used to visually represent data on protected areas within the 3D
city model.