http://www.geog.ucsb.edu/~jeff/gis/choropleth_maps.html
A choropleth map is a thematic map in which areas are shaded or patterned according to the measurement of the target factor being displayed on the map. This map depicts crime rates, and it is an example of a choropleth map because the shade of color for each state indicated the amount of each type of crime that was committed there.
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