A proportional circle map is one in which point data is mapped with a circle instead of a dot. The size of the circle is directly related to the measured variable and NOT necessarily to the area over which it is measured. Specifically, with regards to a Continuously Variable Proportional Circle Map, the size of the circle used corresponds to a specific level of the measured variable in questions. There is no limit on the number or sizes of circles used because they are continuously graded along with the variable. So, as the size of the measured variable increases, the size of the circle will increase in direct proportion to the variable.
the continuously proportional circle map above is illustrating channel width through the use of proportional circles. The size of the circle is directly proportional to the width of the channel.
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