A cartogram is a map in which some thematic mapping variable – such as travel time or GNP – is substituted for land area. The geometry or space of the map is distorted in order to convey the information of this alternate variable. There are two main types of cartograms: area and distance cartograms.
source: wikipedia.com, http://upload.wikimedia.org/wikipedia/commons/2/22/Cartogram-2008_Electoral_Vote.gif
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