LiDAR Technology Aids in Discovery of Guatemalan "Megalopolis"
Sorry for the slight diversion to a geologic application, Wendell.
Here is a 2012 geologic presentation by Joel G. Duncan at the 64th annual Geological Society of America meeting.
Here are two images from his PowerPoint presentation.
Another interesting national Geographic article on remote sensing and archaeology:
From the University of Alabama, Sarah Parcak has been using multi spectral satellite imaging to uncover ruins from Newfoundland, to Scotland, and Egypt. The list of her discoveries is impressive.