A dot distribution map is a statistical map which uses dots in order to show the general locations and occurrence rates of particular data, such as crime or pollution. One of the most famous examples of dot distribution mapping is John Snow's map of cholera cases in the London epidemic of 1854. These maps can help users see patterns in events or to help pinpoint a cause of something, such as the cholera epidemic. This dot density map was created as part of a project which maps the US population of 2000, with each dot representing 10,000 people.
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