I just remembered going to a park over some holiday, I think Memorial Day and there were people selling things. One guy was an aerial photographer and had pictures of all the lakes in the county. I was raised on one of those lakes but the angle of the shot didn't show my old stomping grounds. So if you were to do something like that you would need to think about getting pictures from different angles. The pictures were super sharp so he either had a high end digital or a medium format I presume. Maybe even a LF camera. Ofcouse the cost of hiring a pilot and getting enough people interested in a certain area would be the big problem. It is something you might wish to look into as there are not many doing that. If you were taking a shot of one building, then you might need to get a property release. Ric.