I thought I would share something I have been testing lately.
Here in the UK the government has scanned with LIDAR technology (laser pointing to measure surface height) many parts of the country and in particular London. Point clouds are available online and perhaps there could be a way that they inform the building heights. I have been exploring the following process:
2. I populate the mesh on GH.
4. The result is very convenient in many cases, though it is not easy to control which shape is extruded to the eighest point as larger polygons could contain smaller ones.
I am still looking for a way to filter more the OSM shape component so that the 2D shapes are strictly buildings.
Although the LIDAR files are rather very heavy, perhaps there would be an automated way to query the databases with GISMO.
Food for thoughts.