Flow maps show the movement of some phenomenon, normally goods or people, from one place to another. Lines are used to symbolize the flow, typically varied in width to represent differences in the quantity of the flow. In broad terms there are three main types of flow map: radial, network and distributive. Radial flow maps have a spokelike pattern because the features and places are mapped in nodal form with one place being a common origin or destination. Network flow maps are used to show interconnectivity between places and are usually based on transportation or communication linkages. Distributive flow maps typically show the distribution of commodities or some other flow that diffuses from origins to multiple destinations.
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