Several things you need to know when looking at the aerials. When was the aerial made, is it infrared or black and white, if any agriculture crops are currently planted, what they are, and what is the scale of the aerial and the boundaries of the property you are hunting. You can take topographic maps of the same area and mark out the streams and other natural barriers. After a little field work and a little common sense with the aerials they will open up a lot of ideas. Welcome to the board.