An Unclassed Choropleth Map was designed to avoid the problem that most other thematic maps seem to cause - fixing class limits. The Unclassed Choropleth map instead uses a continuous-tone scheme. Every region on this map has its own specific color that represents its value. The only exception to this would be due to there being extreme outliers - these values would fall into one of two classes on either side of the value range. If there is a very important threshold, there can be two separate color transitions to set class boundaries. In Unclassed Choropleth maps, the numeric value is converted directly into a proportional degree of darkness. The higher the object's value, the darker the shade of representation will be.
The shown diagram displays the fertility rate attribute values for countries in Europe. The maximum fertility rate would be 2.27 children per woman in Albania and it is represented by the darkest shade. The minimum rate of fertility is 1.13 children, in Bulgaria and is represented by the lightest shade.
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