Interaction
Transportation
The City, Services and Central Place Theory

 Nodes: point locations
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But a set of points may comprise a service area
Origins of all people flying out of Lethbridge
County Airport
Destinations
Viewing or listening area for broadcasting
 Routes or route segments joining nodes
 Flows or volume being moved

Why do things move?
The Bases for Spatial Interaction
 Complementarity
 Complementary resource endowments
 Form utility
 Place utility
 Transferability
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Ease of transferance and ability to overcome distance
Distance decay and umland

Why do things move?
The Bases for Spatial Interaction
 Intervening Opportunity
 Complementary resource endowments

 Information genesis
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Broadcasting irrespective of information demand
“too much information”!
 Hierarchy of control
 City size and corporate/government dominance
 Distance independence
 Especially between largest nodes