Dot distribution maps use symbols (dots) to represent an individual piece of information, which helps to display large multiples of individuals to reveal a larger group of information. This picture I used for an example is particularly interesting, because it shows the 1990 USA population, through light & electricity image. The validity of this picture and other similar pictures have been debated, as to whether they really are factual or not. Either way, it does portray a fairly good depiction of the US population.
URL: http://www.geo.wvu.edu/~elmes/geog350/unit02.htm
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