If your raster image is nothing but treetops, they'd have to be pretty distinctive treetops for an aerial view to be useful.
Really depends on the imagery. If you look at my own house on Google maps, it's useless. I live out in the woods and it's just a sea of green treetops. However, look at the excellent NJ 2007 orthoimagery and it's completely different. These were taken from airplanes, not satellites at 1 foot per pixel
in the winter and you can see pretty much everything.
This is the same imagery that Garmin is using in my state. Bing maps has their own imagery, and it was also taken in the winter. Google's is terrible, it also has a huge area that is way underexposed. IIRC, they attribute this lousy stuff to the USDA. Your mileage may vary.
