Range Graded Proportional Circle Map
Useful in representing discrete phenomena with abrupt variations. The data used in this format is usually representative of magnitudes. In the example map below, various sizes of circles and their nominal equivalents are overlaid on a map to represent varying magnitudes of American Indian Populations in different states in 1990. The placement of the circles over the map not only show where these populations reside, but they also easily visually convey the magnitude of each individual population community in doing so.
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