A Range Graded Proportional Circle map is a type of map in which circles of many different sizes are used to represent some value of data. The cartographer decides which size of circle will represent what values of data being studied. Typically the larger the circle, the larger the value of data being observed. One of the main reasons these maps are used is because they allow for symbol size discrimination, not only magnitude estimation.
The map displayed shows the 1990 population distribution in Africa. The largest of the circles represents most heavily populated areas. It is clear from this map that Nigeria is the most heavily populated area.http://www.d.umn.edu/geog/cartfolder/HTML%20Pages/Map-Types.htm
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