Unclassed choropleth maps do not use a scale to direct their data and insead rely on being realtive to the data of other parts of the map. Useful for Sociologists to see things like age, birth rates, death rates, divorse rates, and other information like that. This map in particular shows the realtive percentages of people age 0-15 in a city. http://www.agocg.ac.uk/reports/visual/casestud/dykes/figure9.gif
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