Include Topography in Urban Database

The topography can additionally be considered for urban environments. Either the building heights in the vector database are defined inclusive topography or exclusive. This must be selected when pre-processing the database in WallMan. WallMan determines the topographical height of the centre of the building and then either the relative building height is obtained by subtracting the topographical height from the absolute building height (if absolute heights are given inclusive topography in the building database) or the absolute building height is determined by adding the topographical height to the relative building height (if relative building heights are defined in the building database).

Arbitrary topographical databases can be used and converted with WinProp. As topographical databases are pixel databases they are internally converted during the computation into a triangle approximation of the terrain profile.

Figure 1. Terrain approximation with triangles.