Continuously Variable Proportional Circle Map

A Continuously Variable Proportional Circle Map uses circles that are proportion to the data being measured to represent continuous data. These maps are very useful in displaying information that can not be counted which can be a very difficult task. As seen in the map below the circles are scaled to represent the continuous data proportionately.





http://www.lib.utexas.edu/maps/europe/west_germany_ind_1972.jpg