Cartograms distort the space of the map to convey non-geographic information. It is a way to represent historical, social, political, economic, health data across the world. This map reflects on the real dimension of the global external debt. The green shows a more economically stable place compared to the red. The distortion of the red region and dramatic shape helps viewer get a visual representation of information that is otherwise hard to imagine. In political campaigns, cartograms are useful in show which party is gaining and which districts have changed. I found another great example on
this site, which show three cartograms of the 2010 US midterm election.
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