These are aerial maps of various large cities. What is interesting about them is that they are taken in accordance with the number of photos that were taken by tourists. The most black color in the photos represent where the most photos were taken.
Athens
New York
London
Paris
San Francisco
Boston
Washington, DC
Rome
Toronto
Chicago
Vancouver
Hong Kong
Amsterdam
Madrid
Prague
Las Vegas
Venice
Stockholm
Tokyo
Budapest
Copenhagen
Dublin
Seattle
Edinburgh
Vienna
Sydney
Philadelphia
Melbourne
Montreal
Beijing
Hamburg
Helsinki
Portland
Florence
Brussels
Istanbul
Milan
Lisbon
Moscow
Munich
Buenos Aires
Singapore
Austin
Barcelona
Berlin
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thanks for showing
like the Singapore graph
did a google thing
They know by the Geo-tags that get attached to most digital pictures now. I think this was a flicker project.
http://www.flickr.com/photos/walkingsf/sets/72157624209158632/
Some people interpreted the Geotaggers' World Atlas maps to be maps of tourism. This set is an attempt to figure out if that is really true. 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.
The maps are ordered by the number of pictures taken by locals.