Unclassed Choropleth Maps

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

Unclassed Choropleth Maps use a continuous grey scale.  There are as many intervals as there are areal units.  Although it doesn't seem there would be many advantages to unclassed choropleth maps, they are good for seeking patterns and minimizes the amount of generalization and simplification.  The unclassed choropleth map above shows population change in the United States from 1960-1970 by county.