This map uses a Lambert Azimuthal Equal Area Projection. The coloration of the map displays population density across the U.S. (km^2). The main idea behind the map is to help study the phenomenon of social mobilization. The red circles indicate locations of balloons that were placed around the U.S. with the challenge presented to researchers of finding all of the balloons the fastest using social networking and simulations. I found this to be a very interesting point of study as volunteered geographic information is becoming a much bigger topic.
http://phys.org/news/2013-04-root-limits-social-mobilization.html
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