Living in a neighborhood with a lot of tree cover, I have recently been very impressed with Apple's 3d geometry lately. My area is effectively houses in the woods. I'm amazed they have been able to extract geometry and textures below heavy tree coverage. The foliage geometry is often rough, but the houses, yards, decks, walkways, etc below are quite detailed. Having a little experience with photogrammetry years ago, I'd love to know their process.