I've had good luck with google earth and maps.live.com.

Maps.live.com has a feature called birds eye view for some areas that is just incredible. They show a very high resolution photo from real close when the leaves are down. You can even see the same spot viewed from multiple perspectives. I can see my ladder stand, and make out the tracks from the tractor. It's pretty cool. The leaves down makes all the difference. You tell how thick an area is, and you can easily differentiate between evergreens and regular trees.