I have 3D building model of the city and I would like to export it to proper CityGML model. It is in LoD2 polygonZ geometry shapefile (I split it to classes - RoofSurface, WallSurface), but I missing GroundSurface. I've given it several tries, e.g. in ArcGIS, Interpolate bldg Footprint to DTM etc. None of it hasn't been working. So my final thoughts are that I have to create brand new polygon geometry from the points of the certain ground (I've already started with it in FME). Are there some another solutions for resolving this problem?
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