Range graded proportional circle map

Range graded proportional circle map is a proportional circle map that depicts the circles in relation to ranges of data. is an example of a Range graded proportional circle map first used on maps by Henry Harness, August Peterman, and Minard (1850s).













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