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3D Database Option (3D surfaces)

With this option it is necessary to have buildings entirely in 3D defined in the form of 3D surfaces.

Buildings are not draped, a polygon is created from their minimum Z and this polygon will represent the area of the building on the ground.

The height corresponds to the difference between the highest point and the lowest point on the building.

3D Database Option (polygon)

With this option, it is necessary to have buildings of which the 3D surface corresponds to the roofs of the buildings.

H = ZMax – ZMin

where ZMax corresponds to the highest value of the Z of all the vertices.

If H < Minimum ground floor height, then H = Minimum ground floor height. Ground floor height is defined in the software's default parameters.

To calculate the number of floors, apply the following formula:

Number_Floors = Int((Minimum ground floor height) / Floor_Height)

If the result is less than 0, this means that there are no upper floors.

Lastly, to calculate the ground floor height:

Ground floor_Height = H – (No_Floors x Floor_Height)

Example: there is a building of which the maximum elevation is equal to 214.7m. In the footprint of this building the Z of the ground varies between Zmin = 198m and Zmax = 202m, with a Zmid = 200m. The height of a floor has been fixed at 2.7m. Minimum ground floor height = 2.5m.