You can read all about this here:
http://pitweb.pitzer.edu/communications/2017/02/08/drone-research-documents-reforestation-pitzers-firestone-center-costa-rica/
And, in an obvious omission, they forgot to mention the previous drone work at the FCRE, so, in the name of great science here is a video by Guy Van Rentergem showing some of the earlier work. Science is never complete without the whole picture, or video as is the case here. And if you haven't seen this video, you are in for a real treat!