Unclassed choropleth maps use a continuous grey scale, unlike that of a classed choropleth map. In a unclassed map there are as many intervals as there are areal units. With the unclassed choropleth maps they more commonly utilize a continuous scale while still incorporating individual values unlike the classed choropleth maps that are used today. A major difference with the unclassed is in that of the grey scale, the unclassed map is totally grey like the one pictured above. The unclassed map above is an illustration of various counties which are incorporated into a gey scale.
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