http://arapaho.nsuok.edu/~ziehr/virtual/human_wg/agric/guided.html
A Dot Distribution Map is a type of point pattern map that uses dots as a nonproportional point symbol, and each dot represents a specified value. This particular dot density map displays the value of crops that were sold throughout the United States of America in 1992. Each dot represents a value of 10,000,000 dollars of crops sold within the area in an attempt to highlight the best land for agriculture in relation to agricultural crop production.
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