The map above is an example of a standardized choropleth map. A choropleth map is a map that expresses areal data. The area being observed is always divided by country, state, or county lines. Them map above is of the United States and all the states are bounded by state lines. The data is areally averaged by density, or energy consumption of states by million Btu's. since it is areally averaged, it is also known as a standardized choropleth map.
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