You have access to a program that, somehow, extracts hidden GPS coordinates from the metadata embedded in the pictures. With the known location of the tree, you then use a spy satellite to zoom in on the tree in question to make a positive ID.
Sound about right? Cheater...
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Actually, I just throw stuff at the wall and some of it sticks. Just got back from the Morton Arboretum, and I've got TFAD material for the next year or so!