Color adds a great degree of richness to the artistic and readability values of a map. Chrolopleth maps specifically focus on a color shading system to display one or many variables and how they compare across a given geographic area. For example, population density can be easily displayed using a choropleth map with a series of blues from light to dark to show how dense an area is. This map shows data used to prepare maps to compare the variables of presidential candidate votes to crime rates in areas across the United States.
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