Unclassed Choropleth Map

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

An unclassed choropleth map is a thematic map similar to a classed choropleth map (explained in the previous wall post) but with one major difference. Here, the shading is not predetermined to be five colors, but ranges in shade directly proportional to the amount of a variable present in an area. While this gives a more accurate and precise measurements, it is hard to determine by looking at the map alone the exact amount of variable. The map above shows vegetation in northern South America. The shading is directly proportional to the amount of vegetation present.