A standardized choropleth map is a type of choropleth map where the area is standardized to allow for easy comparison across different areas. Standardization is useful because the different sizes of the area mapped may alter the impression given off. Some examples of standardization include land area, percents, rates, ratios, per capita, or any per capita variable. The picture above in an example standardized choropleth map of North Carolina. The per pupil expenditure for public education in North Carolina is divided into ranges distinguished by different shades of the color blue.
http://personal.uncc.edu/lagaro/cwg/color/Choro5-SingleHueGood.gif
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