> > Colons in keys are likely to make many casual mappers uneasy about > > editing said tag, let alone two of them in one key. >
Casual mappers seem an unlikely target for this particular type of highly technical mapping. ------------ That said: The 3D mapping by tags is interesting. But another trends is out there: rapidly increasing availability of high quality 3D elevation maps based on LIDAR data. The "first return" version of this data shows trees and tree tops. You can readily get building and ground levels as well, picking out individual buildings and rooftops and their slopes. If the lidar data informed OpenStreetMap, what would remain uncoded in 3D? That's where I would focus my energy: adding to the data produced by LIDAR. "height_min/clearance" is one such tag, as the LIDAR data won't tell you much if anything about the underside of things. http://www.gearthblog.com/images/images707/lidar.jpg
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