Africa's Eye in the Sky 
http://www.youtube.com/watch?v=Ady3qOXLZlU&feature=related
In 2004, Michael Fay conducted an eight-month aerial survey at 300 feet (91 meters), flying across the entire African continent on a project called the Megaflyover. He logged 800 hours and took 116,000 vertical images of the human footprint on associated ecosystems. The Megaflyover is the subject of "Tracing the Human Footprint" in the September 2005 issue of National Geographic.

http://ngm.nationalgeographic.com/ngm/megaflyover/