Nominal Area Choropleth maps are used to display nominal data over a specified region. Nominal data is defined as categorical data where the order of the categories is arbitrary, such as race, ethnicity, political party, hair color, etc...
Above we see nominal data (European nations) mapped to colors. Notice that the colors aren't in an organized scale in any sense. There are no obvious color ramps to imply order. We simply map nomimal values onto discrete colors.
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