A few of us have experimented with doing tree mapping in Bangalore with good results http://openstreetmap.in/events/2016/02/13/bengaluru-tree-survey.html
You can check the data here: http://overpass-turbo.eu/s/eoA Broadly there are two steps to the process: 1) Map the tree locations accurately. This in itself is a pretty tough problem as the accuracy of a GPS is usually not enough to locate a tree. What has been most effective is to first trace the building footprints on the street, and then use them as reference features to position the tree correctly with around 1-2m accuracy. 2) Add tree properties. This requires some prior training on identifying species and measurement tools to capture properties like trunk girth and height. Canopy area can be mapped from satellite imagery. <http://j.mp/ArunGanesh>
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