#31 Range Graded Proportional Circle Map

>Source: http://mapmaker.rutgers.edu/355/dotProporCircle.jpg
Range graded proportional circle maps use evenly graded circles to show their data. There is a set number of sizes that can be used, unlike variable maps which exhibit size variation.

#30 Continuously Variable Proportional Circle Map

A continuously variable proportional circle map uses circles in order to show data. Size of the circles is important because the larger the size the larger the value of data. Circles are in some sort of proportion to the data bein displayed. This map is of West Germany and shows the major industries of each produing city.

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

#11 Proportional Circle Maps

>Source: http://www.neiu.edu/~nerobert/Circle%20Map.jpg

Proportional circle maps display data via circle representation. The larger the circle indicates the larger the data in value is. This proportional circle map shows the American Indian Population in several states in he U.S. Oklahoma and Arizona have the largest populations of Indians.