"The recently presented academic paper at the WWW 2009 Conference from a group of computer science academics from Cornell University investigates the collection of roughly 35 million geotagged photos collected from Flickr, uploaded by more than 300,000 users. Their approach used in Mapping the World's Photos [www2009.eprints.org, PDF] combines content analysis based on text tags and image data with structural analysis based on geospatial data. While individual users of Flickr are simply using the site to store and share photos, their collective activity reveals a striking amount of geographic and visual information about the world."
http://infosthetics.com/archives/2009/04/mapping_the_worlds_photos_extensive_flickr_photo_analysis.html
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