(This article was originally published at information aesthetics, and syndicated at StatsBlogs.)
Census Dotmap [bmander.com], developed by computational urban planner Brandon Martin-Anderson, maps every person counted by the 2010 US and 2011 Canadian censuses as a single dot. Consequently, the map contains about 341,817,095 dots - one for each person.
Technically, as the available census data is only available on a block level, all dots are placed randomly within each block's perimeter. More explanation about the development can be found here.
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