You'd need stereo fotos from a low flying plane for this. Several cities are doing this for decades already. I've built such a 3D map for my city like 25 years ago.

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josters 3 days ago | parent [-]

Are you referring to the outside seating polygons? Wouldn’t these stereo images still have a lot of noise (trees, cars, trucks, smaller non-building structures) obstructing the target areas?

	▲	rurban 3 days ago \| parent [-]
		Outer walls, but mostly roof lines. Some noise, but since houses have a certain size and being mostly rectangular helps. Just carports and garden houses are special.