Cartograms are maps of thematic variables based on concentration. The geometry of the maps features are distorted to highlight the areas where the variables are greatest. Cartograms are hybrid maps because they start with a base, such a planimetric map, and then incorporate distortion density. This cartogram shows the concentration of Walmart, McDonalds and Starbucks store locations in America. All three maps are similar because the eastern and middle United States show a uniform distribution of locations. Then in the northern U.S., store locations lose density and distort the map. On the West Coast, especially in California, the concentration of store locations increase significantly.
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