Returns the number of basement, ground, and roof floors of the given mesh
building. This is done by making horizontal cuts within the building and
comparing the areas of these cuts.
The parameter storey_height describes the height of a single storey. This
value provides the basis for the storey determination. Based on the value,
the heights at which the horizontal cuts are made can be determined. If no
storey_height is specified, a default value of 3 meters is used.
The distinction between roof and ground floors is based on a threshold for
the floor area. As soon as the area of the current floor is less than 80%
of the floor area of the building, the current floor is recognized as a
roof floor. The area of the current floor is calculated using the horizontal
The parameter last_storey_min specifies how high the last floor must be
at least in order to be counted as a floor. A default value of 2.5 meters
is used here. If the last floor is smaller than this value, it will not be
included in the result.
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