Range graded proportional circle map is another type of proportional circle map that displays data using circles to represent data instead of dots. The size of the circle relates to the measured variable and not the area it is covering. There are only a set number of circle sizes that are used in each map. The amount is designed based on information being displayed. The map above is an example of a range graded proportional circle map. Using four different sized dots, the amount of inhabitants of the communes in the region of Zurich can be displayed for easy analysis.
http://www.e-cartouche.ch/content_reg/cartouche/cartdesign/en/html/ThemMaps_ThemData.html
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