Yeah, there is high-resolution data available, but it is scattered around small-scale web portals mostly built by the government in this local area, and aggrega

Yeah, there is high-resolution data available, but it is scattered around small-scale web portals mostly built by the government in this local area, and aggregating and polishing this data is a non-trivial huge effort (they come in different scales, projections and quality). Furthermore most data is orthographic only, so you can built a nice 2D map out of it, but to do 3D I estimate you need images from specified angles (e.g. 4 views per place), and I think this data is still behind closed doors and quite expensive.