Continuously variable proportional circle map

 

http://go.owu.edu/~jbkrygie/krygier_html/geog_353/geog_353_lo/geog_353_lo11.html

On Continuously variable proportional circle maps, the size of the circle is proportional to the value being measured. Because of this, we can look at a map of this type and identify areas of, for instance, the types of meat sent to Paris from different areas of France in 1858 as seen in the map above.