Eric Fischer posted a fascinating series of images on his Flickr account, WalkingSF. Using geotag data from photographs that are accessible via Flickr and Picassa, Mr. Fischer created maps that show the locations of photos taken by people presumed to be residents or visitors to cities around the world. I find the results fascinating.
Some cities (for example Las Vegas and Venice) do seem to be photographed almost entirely by tourists. Others seem to have many pictures taken in piaces that tourists don’t visit.
Blue points on the map are pictures taken by locals (people who have taken pictures in this city dated over a range of a month or more).
Red points are pictures taken by tourists (people who seem to be a local of a different city and who took pictures in this city for less than a month).
Yellow points are pictures where it can’t be determined whether or not the photographer was a tourist (because they haven’t taken pictures anywhere for over a month). They are probably tourists but might just not post many pictures at all.