While it is not a map in the traditional sense, this type of graph and others like it are useful in showing cartographic and geographic data for others to analyze. This type of graph is used to display both positive and negative statistical values, such as increases and decreases in a value. It can also be used to set multiple data sets next to each other for comparison, like in the graph showing an opinion poll.
Where example was found: http://media.gallup.com/poll/graphs/080429China2Graph2_GASJIDHUQfredo.gif
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