Open Street Map looks like it only provides 2D building borders while Google has 3D. Google doesn't even provide an API for accessing it.
Bing also only has 2D building boundary data, albeit at a slightly higher level of detail than OSM.
Is there an open source database for the 3D data or is that proprietary Google info? Is OSM the only source for free building boundary data?
Open Street Map looks like it only provides 2D building borders while Google has 3D. Google doesn't even provide an API for accessing it.
Bing also only has 2D building boundary data, albeit at a slightly higher level of detail than OSM.
Is there an open source database for the 3D data or is that proprietary Google info? Is OSM the only source for free building boundary data?