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.