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choropleth map

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  1. [cartography] A thematic map in which areas are styled to represent classed values of a particular phenomenon or attribute. These are assigned a color, lightness, color saturation, or pattern depending on the magnitude of the attribute. From the Greek terms choro meaning place, space, or land, and pleth meaning full. A bivariate choropleth map, also called a relationship style, is a thematic map that displays two or more of these attributes on a single map by combining different sets of symbols.

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