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Spatial interaction is the representation and simulation of flows of activity between locations in geographical space. Locations are usually represented as discrete points in space, which in many applications might approximate an area. The flows range from physical flows of materials, such as freight; flows of people, such as traffic or migration; flows of ethereal activity, such as e-mails, telephone calls, and visits to Web sites; as well as more abstract linkages that occur in space, such as patterns of marriage and friendship, which are the activities associated with social networks.

The focus of these representations is on models that simulate interactions in which the time over which such interaction takes place is significant. There is a key distinction between routine and occasional interaction. Traffic in ...

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