http://enb150-2011f-kn.blogspot.com/2011/09/lab-1-cartography.html
A choropleth map displays a particular variable by using different concentrations of colors and also by the use of different shades. Choropleth maps allow us an easy way to visualize how a measurement varies across a region. The map above uses different shades to display the portion of each state's population that lives in urban areas for the year 2000.
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