A choropleth map is a thematic map that represents a statistical variable on a map by using shaded or patterned areas. An example of what a map like this would be population density or per-capita income. The use of choropleth maps are a easy way to visualize how a measurement varies across a geographic area that shows variability of a region.
http://www.cartozine.com/wp-content/uploads/2012/05/Unemp_Choropleth.jpg
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