This is an awesome Idea. I live in Place that is surrounded by a florest (Ubatuba -SP - Brazil ), and I see it every day being cut down. After read about your effort in map trees in streets I just realize how important could be to map, at least the oldest one in the forest, as they generally are really important as a seed spreed and animal life. As I like to walk sometimes in tracks here I just will try to map them too