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Has anyone every heard of a program which analyses a satellite map and attempts to generate three dimensional buildings that roughly match the length/width of their real life counterparts?

The use in programs like Google Earth would be phenomenal, and it would be particularly amazing for projects like FlightGear.

I'm just about to start writing such a program myself, but I thought I would make a quick inquisition to see if such a thing exists already.

Anybody heard of something like this already existing? Any thoughts/comments?

EDIT:

Any references to related work would be great as well!

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