A cartogram is a map that illustrates some type of thematic mapping variable such as population or travel time. For these types of maps the geometry or space of the map is distorted in order to correctly depict the information that one is trying ti display. There are two main types of cartograms, area and distance cartograms.
http://www.geocurrents.info/economic-geography/non-state-based-atlas-preface-part-ii
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