Classed choropleth maps combine data into a smaller number of groups and portray them in intervals. In this example, the cartographer has divided the total range into four categories of equal intervals, encompassing all of the states. The content of this map is state level population data from the 2000 Census. It compares the number of males in the population to the number of females. The number of classes/groups and the classification techniques can really change the results and the appearance of these kinds of maps. This website has great maps and descriptions reflecting the importance of data collection, processing, aggregation and presentation of spatial information. Link to website source:
www.ilstu.edu/~jrcarter/Geo204/Choro/
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