Unclassed Choropleth Maps

http://go.owu.edu/~jbkrygie/krygier_html/geog_353/geog_353_lo/geog_353_lo07.html

An Unclassed Choropleth Map involves shading proportional data without actually classifying the data. With an unclassified choropleth map there can be as many intervals as there are areal units. The image on the left a classified choropleth map using interval classification. The image on the right is an unclassified choropleth map of the same image.