Unclassed Choropleth

An unclassed choropleth is designed to show statistical data in a multi-colored value moving from smallest to largest, using lighter colors to portray smaller values and using progressively darker shades to portray progressively greater values. The map above shows the rates of illiteracy in France with shadings from black to white (distribution and intensity of illiteracy in France). This is the first unclassed choropleth map, and perhaps the first modern statistical map. (This map dates from 1826.