http://geographer-at-large.blogspot.com/2011/11/map-of-week-11-28-2011the-spread-of.html
Flow maps are great for displaying the movement of objects or things from one place to another. A few examples of typical flow maps are the migration of people, the amount of goods being traded, or the number of packets in a network. The map above shows the flow of certain diseases across the world.
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