Today’s Agenda Assignment 1 is due Monday

I’ll accept until Friday without penalty Questions? Review Taaffe’s Model Gravity Model Atlanta

Taaffe’s 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

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)

I kPP

dij

i j

ijb

Gravity Model of Spatial Interaction

CALG750K

LETH65K

MH45K

300 km

220 km

170 km

CALG MH LETH

CALG ---

MH 375,000 ---

LETH 1,007,231 101,211 ---

Interaction Matrix

000,375300

000,45000,75022

MHCALG

MHCALGMHCALG

d

PPI

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.

Atlanta

Emblematic of the “new south” Rapid growth in sunbelt Urbanization, industrialization, high technology, corporate centre,

transportation Rivalry with Savannah as Georgia’s key port Railroad Delta airline hub Interstate highway system and I-285 beltway Edge City/suburban downtown phenomenon Decentralization of Office space

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