Flow maps are a mix of maps and flow charts, which show the
movement of objects from one location to another, such as the number of people
in a migration, the amount of goods being traded, or the number of packets in a
network. Flow maps show linear movement between places; also, the width of floe
line is proportional to quantity. The map above is an example of a flow map
because it shows the market catchments and flows for commodities important to
food security.
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