Continuously variable proportional circle map use circles to show the variables. The circles in this one have infinate different sizes and are not limited to sizes in a scale. As this one shows, the larger the circle the larger the water flow through the river, notice how the larger circles are the Columbia River in Washington and the Missouri River. This was found off the USGS website. http://pubs.usgs.gov/fs/fs-004-03/images/fig5lg.gif
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