A classed choropleth map is a choropleth map that has combined the data for states, countries, regions, etc. into smaller groups which are then portrayed in intervals. The techniques to create a classed choropleth include taking equal steps, quanitiles, natrual breaks, and minimal varience, that is, each group has to be as homogenous as possible within the group, but as different from the other groups as possible. In the above classed choropleth, printed in a Prussian Atlas in 1828, the author of the map used color to signify the various class breaks, which can be seen along the bottom of the map.
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