In the last years, Google models not only are major cities, but also suburban and rural areas (google video)
I read that there are some tridimensional model building algorithm here.
How could such algoithm work? Stereovision? Multiple photos?
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They basically use 3D reconstruction based on ground and sometimes aerial footage of places, generally using stereo cameras. With this footage, they build a 3D point cloud based on the images to do the reconstruction (which is particularly trivial for a stereo setup).
I was told that if the reconstruction isn't good enough for more important/well known landmarks, they will have someone create a better 3D model in some CAD software. But I do think most of what they have, impressively, is done algorithmically based on 3D point clouds and potentially some other things I am unaware of (homographies maybe?).