Dot Distribution Maps show where specific data characteristics occur in a given area. With dots the number of these occurrences is given in relation to their location. The map above represents population distribution across the United States from the census in 2003. With such a large area represented on such a small scale the density of population is what is being conveyed, not the specific location of each and every citizen.
http://www.census.gov/geo/www/mapGallery/images/small2kden.jpg
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