Urban Location Theory and Interaction Notes

Urban Location Theory and Interaction

Cities represent incredibly local and intimate spaces while also embodying complex interactions with other regions. They are analyzed via models that help geographers study urban growth and their significance.

Essential Question
  • In what ways do geographers study and understand the growth and importance of cities?
The Urban Landscape
  • The ecumene refers to the permanently inhabited parts of the Earth's surface, showcasing a variety of community types and population densities. Key components include:
    • Urban Areas: High population density regions (cities).
    • Suburbs: Primarily residential areas adjacent to cities.
    • Rural Areas: Communities with low population density (farms and villages).
Factors Driving Urbanization and Suburbanization
  • Settlements began developing around 12,000 years ago with the advent of agriculture, transitioning from hunter-gatherer societies.
  • Early settlements had:
    • Agricultural Surplus: Increased food production supported more people.
    • Social Stratification: Emergence of a leadership class.
    • Job Specialization: Development of crafts and services, allowing communities to thrive.
Urbanization
  • The ongoing process of city and town development known as urbanization involves:
    • Continuous growth of existing cities.
    • A common statistic is percent urban, indicating the proportion of the population residing in urban areas versus rural.
  • By 2030, it is estimated that 60% of the global population will live in cities, particularly less developed countries.
  • Urbanization can bring benefits, but too rapid growth poses significant challenges.
Suburbanization
  • Suburbs are residential areas situated next to urban centers, leading to the process of suburbanization, characterized by:
    • Movement of populations from cities to suburban residential areas.
    • Suburbs typically exhibit lower density and less ethnic diversity than urban areas.
Causes of Suburbanization
  1. Economic Expansion: Post-WWII growth leading to increased purchasing power.
  2. Transportation Innovations: Rise of car-centric lifestyles and extensive highway systems.
  3. Government Policies: Mortgage loans from the Federal Housing Administration facilitating suburban growth.
  4. Racial Dynamics: White flight in response to increased African American migration to northern cities, resulting in urban decline combined with suburban rise.
Shifting Trends
  • From 1960 onward, the suburban population increased while rural declined slightly, peaking at over half of the U.S. population now residing in suburbs.
  • Reurbanization and exurbanization denote trends where certain populations return to the city or move to outlying rural areas.
Population Change in New York City and Suburbs
  • Illustrates post-WWII suburban growth and subsequent reurbanization over time.
Influence of Site and Situation on Cities
  • Early urban centers developed during the Neolithic Revolution, leading to the formation of city-states characterized by:
    • Agriculture-fueled prosperity.
    • Political independence.
  • Notable early urban hearths include:
    • Tigris-Euphrates Valley, Nile River Valley, Indus River Valley, and Huang-He floodplain.
Defining Cities
  • Cities are generally defined by:
    • Legal Boundaries: Established territories, often overlapping with other cities.
    • Metropolitan Areas: High population density collections of adjacent cities.
    • Morphological Characteristics: Physical layout including built-up areas and outskirts.
Urban Structure and Social Characteristics
  • Cities are diverse, often attracting various populations due to higher social heterogeneity compared to rural areas.
  • Improvements in transportation lead to urban expansion and increased mobility.
Borchert's Model of Urban Growth
  • Developed by John Borchert, this model outlines urbanization driven by transportation technology across four epochs:
    1. Sail-Wagon (1790-1830): Importance of water ports and river cities.
    2. Iron Horse (1830-1870): Rail connections enhancing inter-city travel.
    3. Steel Rail (1870-1920): Further development of rail networks and industrial sites.
    4. Auto-Air-Amenity (1920-1970): Car-centered urban sprawls and airport hubs.
Distribution and Interaction of Cities
  • Gravity Model: Proposes greater interaction between larger, closer cities; while the model holds, regional factors can skew interactions (e.g., tourism).
  • Rank-Size Rule: Indicates the nth largest city in a region will be approximately 1/n the size of the largest city, signifying a balanced urban service distribution.
  • Primate City: The concept where the largest city in a region dominates economically and politically, often seen in less developed regions (e.g., Mexico City vs. other Mexican cities).
Central Place Theory
  • Proposed by Walter Christaller, explains city distribution based on market areas, with key concepts of threshold (population size for services) and range (distance traveled for services).
  • Market areas are ideally hexagonal to eliminate overlaps and ensure equal service access.
Megacities
  • Defined as cities with over ten million residents, increasingly found in developing regions due to urbanization phenomena. These cities often face significant social and infrastructural challenges.
World Cities and Megalopolis
  • Major global cities (e.g., London, New York) are termed world cities, exerting international influence.
  • Megalopolis describes interconnected metropolitan areas, like the Bos-Wash Corridor in the U.S. and Tokyo-Yokohama in Japan.
Geographic Perspectives: Brasília
  • The Brazilian planned city, Brasília, exemplifies government-driven urban development, promoting focus toward the country's interior.
  • Critics argue that while Brasília's design reflects ambition, it lacks the human scale and communal spaces typical in organically developed cities.
Key Terms
  • Ecumene: Permanently inhabited area.
  • Urbanization: The process of city development and expansion.
  • Suburbanization: Movement of populations to suburbs.
  • Urbinization: Reversing suburban trends back to cities.
  • Megacities: Cities with populations over ten million.
  • Central Place Theory: Explains the spatial distribution of cities based on service areas.
  • Primate City: A dominant city in an urban system.