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choropleth map

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  1. [cartography] A thematic map in which areas are styled to represent the variation of values for a single variable, such as Average Household Income. From the Greek terms choro meaning place or land, and pleth meaning full.
    A bivariate choropleth map—also called a relationship style—is a thematic map that displays two or more variables on a single map by combining different sets of symbols.

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