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wildlife migration, etc.

Types of flow maps

The variance of flow maps in subject matter, and the relative importance of Imhof's aspects of flow, has led to a number of design strategies. In a 1987 thesis, Mary Parks identified several distinct types of flow maps, which has been widely cited although her list was not comprehensive and more are included here. These types are prototypical; actual maps can combine some aspects of several types.

Origin-destination map

In

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