http://www.math.yorku.ca/SCS/Gallery/milestone/sec5.htmlUnclassed choropleth maps use continuous tone shading to depict values. There is no data chart, key, or schedule that goes with this type of map, thus we call it unclassed. The map above should be familiar to those who study maps; it is the first unclassed choropleth map; it represents the “distribution and intensity of illiteracy in France” and it was created by Pierre Charles François Dupin in 1826.
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