Choropleth maps are thematic maps that show density based on predefined aerial units. Think of it as a multi-colored checkerboard map. Some maps use graded color series to show least intensity to most intense (shown using a light to dark color pattern) in proportion to the measurement of a statistic. It provides an easy way to visualize how a measurement varies across a geographic region.
The image above is a choropleth map showing the percentage of hispanic Floridians per county, based on Census Bureau data from 2000.
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