A proportional circle map is a type of point pattern map. In a proportional circle map the size of the circle or symbol is dependent directly upon the measured variable. There are two different types of proportional circle maps, range graded and continuously variable. Range graded proportional circle maps have a set of circles listed in the legend and the data must fit into one of the circles used in the legend. The map above shows the percent of protected terrestrial areas around the world. These areas range from 0% protected - 53.8% protected. Every protected area in this map falls into one of the proportional circles categories, they do not vary in size from those that are used in the legend.
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