A nominal area choropleth map is a thematic map that represents areal data. These types of maps use different colors or symbols to distinguish between certain areas and regions. Nominal data is represented meaning that there is no ranking to this information so there are usually many different colors used to represent cartographic information. These types of maps are great for comparing measurements or data between states or regions.
http://my.ilstu.edu/~jrcarter/Geo204/Choro/Tom/
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