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Some are from Satallite and some are from a plane. It depends on the city, or region you are looking at. THe quality will vary a lot too. If you look out in the midwest, the pics are poor for the most part. They cut and paste pics from all sources. But around here they are usually pretty good. San Diego, Ca. has some of the best quality pics that I have seen, I believe it as a sharp as image as a civlian can view with out being "Classified". Maybe 1m per pixal. The pics can be years old, to pretty recent. It all depends.
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