Now that you mention it; about a year, maybe year and a half ago. As near as I can recall it was something like ground penetrating radar that was somehow able to locate what the authors claimed were ancient foundations and the like.
This lidar thing is really neat!
Yeah, you’re right, I think I’ll try another search.
Aha.
http://www.freerepublic.com/focus/news/1973759/posts