A dot distribution map shows the presence of a phenomenon by means of dot symbols over a given area. There are two types of dot distribution maps: 1). One-to-one where each single dot represents one particular phenomenon. 2). One-to-many where one dot can represent any number of phenomenons designated by the map creator. The map above is from the U.S. Census Bureau and displays the U.S. population distribution in 2000. In this nighttime one-to-one map, each white dot represents 7,500 people.
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