Classed Choropleth Maps are a type of map that selected areas are shaded or colored to reflect that specific area within specific boundaries. In these maps it is the value range of a numeric attribute that is divided into differently colored intervals.
The above image is a classed choropleth map that uses a series of only four colors to divide the data into four equal intervals. The data portrayed in the map comes from the Census Bureau 2000, and gives the proportion of one male to each 100 females in a given state in the 50 United States of America.
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