A choropleth map is a thematic map that is shaded to a certain degree of darkness relative to the density of the information that it is trying to present. For example, this map of Florida shows the percent of Hispanics per county. The darkest green is 35.7 to 57.3 percent and correlates to the map as Dade and a few other South Florida Counties. The lightest shade is 1.5 to 3.9 percent and most of the Northern and some central counties are in this range.
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