Barence writes "Hundreds of thousands of images on Flickr are being used to teach a program to determine the geographic location of an image, simply by looking at it. The program attempts to mimic the way that humans can deduce the location of an image by searching for visual clues, such as similarities to pictures or locations they have seen previously. In its current state it can guess the location of a photo to within 200km, 16% of the time — extremely accurate given the complexity of the problem." Link to Original Source
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is kind of cool. If they wanted to increase accuracy they should look at identifying things like trees and plants in the images or, as in the case where a geologist was called in to determine the types of rock in a Bin Laden image.
There is also terrain recognition, discerning the season that image was taken in, and a lot of other factors that go into the determination.
I used to do something similar to this for a group of people as a method of identifying certain geographic locations that the photo subject
Photo Forensics (Score:1)