Classed Choropleth Maps

http://personal.uncc.edu/lagaro/cwg/color/color_symbol.html

This is an example of a classed choropleth map because it takes the information, which in this case expenditures for public education per pupil, and plaes them into "classes" that are color oriented. Each county in North Carolina is represented by one of the five classes located in the key in the bottom left. This map does a great show representing the values because the color gradient of yellow to green really makes the lowest and highest regions stand out.