A flow map is defined as a mix between a map and a flow chart. These maps show movement of objects or people from place to place. This map above shows the flow of goods to and from the U.S. It uses a line to show the direction or destination of the goods and the width of the line to show the quantity. These maps have a number of purposes from showing the traffic on roads to showing the immigration of people. An interesting map I noticed in my searching showed the flow of diseases from Europe, which would be very useful to a number of people.
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