http://my.ilstu.edu/~jrcarter/Geo204/Choro/Tom/
Choropleth maps are based on predefined aerial units, designed in a multi-colored cheakerboard pattern.
Each group of data displayed and organized in a ratio value, so color graded series is used to show the intensity from greatest to least. the darker the shade of a color the more intense and vice-versa goes for the less intense.
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