Leafsnap

Researchers from Columbia University, the University of Maryland, and the Smithsonian Institution have joined forces to develop a series of electronic field guides. Their first effort, Leafsnap, uses visual recognition algorithms to identify trees via photos of their leaves. Their species list is currently limited to trees found in the New York City and Washington D.C. areas, but will soon grow to cover the continental United States. Leafsnap is available as a free iPhone app at the iTunes App Store. ( Via Kottke and Garden Design )

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