http://www.gigawiz.com/thematic.html
A thematic map is a type of map or chart especially designed to show a particular theme connected with a specific geographic area. These maps can portray physical, social, political, cultural, economic, sociological, agricultural, or any other aspects of a city, state, region, nation, or continent. The map the US above shows political party affiliation by governors' office in January of 2007.
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