Today

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Todays Agenda

• Assignment 1 is due Monday
• Ill accept until Friday without penalty
• Questions?
• Review
• Taaffes Model
• Gravity Model
• Atlanta

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Taaffes Network Model of Development A Sequence
of Ideal Types

• Local ports and hinterlands
• Penetration lines (e.g. mine to port)
• Network interconnection (interior hubs)
• High priority trunk lines

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Gravity Model of Spatial Interaction

• where
• I interaction
• P population, or some other surrogate k
  constant (scalar)
• d distance between points i and j.
• b friction of distance (slope of distance decay
  function)

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Gravity Model of Spatial Interaction
CALG 750K
300 km
MH 45K
220 km
170 km
LETH 65K
Interaction Matrix
CALG MH LETH
CALG ---
MH 375,000 ---
LETH 1,007,231 101,211 ---
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Gravity Model of Spatial Interaction

• P may be based on other measures
• total employment for POP
• total registered vehicles
• total employment income etc
• Exponent, b may be based on other measures of
  friction of distance
• travel time rather than distance
• travel cost rather than distance
• Consider effect of technology change on b.

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Atlanta

• Emblematic of the new south
• Rapid growth in sunbelt
• Urbanization, industrialization, high technology,
  corporate centre, transportation
• Rivalry with Savannah as Georgias key port
• Railroad
• Delta airline hub
• Interstate highway system and I-285 beltway
• Edge City/suburban downtown phenomenon
• Decentralization of Office space

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Impact of Transportation on Economic Activity

• Water coastal, river, lake, cities
• Railway Prairie cities
• Highway development 3 phases of impact
• Substitution shipping by rail?road
• Modal separation
• Pedestrians and highways
• Transition adjacent land use/density
• Induced demand
• Developmental
• Transportation ? Economic activity