1. Economic Geography Part II
Interaction
Transportation
The City, Services and Central Place Theory

2. Principles of Spatial Interaction
Transportation: movement of goods and people from one place to another
Mode: marine, railway, highway
Mode: walking, bicycle, bus, LRT, subway
Communication: movement of information from one place to another
Medium: voice line, fibre-optic
Spatial interaction = transportation + communication

3. DC-117 Autoparts, Toronto-Nashville

4. Trail drive

5. Rail-based meat distribution, reefer3
Rail-based meat distribution, reefer

6. Semitrailer cattleliner

7. Spatial Interaction Nodes: point locations
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

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