Survey for pre-Columbian sites in Amazon

[Duncan Head]

http://www.bbc.co.uk/news/science-environment-31467619

There have been a few stories over recent years about finds of earthworks suggesting that the pre-contact Amazon basin was more densely populated than previously thought. Now the idea is to survey the region using drones to try to quantify  the scale of occupation.

For earlier reports, try
http://news.nationalgeographic.com/news/2008/08/080828-amazon-cities.html
http://news.nationalgeographic.com/news/2010/01/100104-amazon-lost-civilization-circles/