http://www.amphibiaweb.org/amphibian/cartograms/
A cartogram is a type of graphic that depicts attributes of geographic objects as the objects area. A cartogram doesn't depict geographic space but rather changes the size of objects depending on a certain attribute, a cartogram isn't a true map. Cartograms vary on their degree in which geographic space is changed; some appear very similar to a map, however some look nothing like a map at all. There are three main types of cartograms- Contiguous, Dorling, and Non-contiguous cartograms.
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