Proportional Circle Map of U.S. Walmart Stores in 2009
There is point data mapped with a circle instead of a dot. The size of the circle relates to measured variable and not necessarily the area over which it is measured. The smallest circle on this map is 1, while the largest circle represents 100. This is a point pattern map. There are two types of proportional circle maps: continuously variable symbols and range-graded symbols.
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