Range graded proportional circle maps show the size of something by comparing it to the size of the circle on the map.
The above image is a representation of a Range Graded Proportional Circle Map which portrays river characteristics. The area of the circle is proportional to the channel width. The color of the large circle approximates the color of the water. Descriptions of the bed material are determined by the position of the solid black circle within the black triangle.
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