Monday, April 14, 2014

Bivariate Choropleth Maps

http://upload.wikimedia.org/wikipedia/commons/f/fc/2004US_election_map.com
Bivariate Choropleth maps are maps that display two different measurements on the same map by using two different graphics or symbols.  These maps are great to show the presence of two related phenomena. The map above shows the voting percentages for the 2004 election along with the percentage turnout of the voting population by state.  From this map one can see which candidate was favored and, at the same time, what percentage of the voting population actually voted.

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