Proportional circles map are statistical maps that use a series of circles in increasing/decreasing size to illustrate proportional quantititative measurements. The size of the circle associated with each area of the map is proportional to the variable being described on the map. For instance, the above map is a map of Europe with circles of variable sizes assoicated with each country. These circle proportionately represent the amount of internest users within each country. As you can see, Denmark (one of the smaller nations in Europe) has roughly the same amount of internet users as Norway or Sweden (countries several times bigger than Denmark).
http://www.geog.ucsb.edu/~jeff/gis/proportional_symbols_files/map2.jpg
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