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An Anatomy of Urbanization in Sub-Saharan Africa

Author

Listed:
  • Pierre-Philippe Combes

    (ECON - Département d'économie (Sciences Po) - Sciences Po - Sciences Po - CNRS - Centre National de la Recherche Scientifique, CEPR - Center for Economic Policy Research)

  • Clément Gorin

    (UP1 UFR02 - Université Paris 1 Panthéon-Sorbonne - École d'économie de la Sorbonne - UP1 - Université Paris 1 Panthéon-Sorbonne, CES - Centre d'économie de la Sorbonne - UP1 - Université Paris 1 Panthéon-Sorbonne - CNRS - Centre National de la Recherche Scientifique)

  • Shohei Nakamura

    (World Bank Group)

  • Mark Roberts

    (World Bank Group)

  • Benjamin Stewart

    (World Bank Group)

Abstract
This paper provides a detailed descriptive analysis of patterns of urbanization across Sub-Saharan Africa for the year circa 2015. Despite the rapidity and importance of Sub-Saharan Africa's urbanization, little is known about the anatomy of patterns of urbanization across the region due to a lack of detailed and accurate official data on urban settlements and populations. To address this gap, the paper applies a modified version of the "dartboard" algorithm to high-resolution gridded population data for the region, which is derived from digitized maps of the footprints of all buildings in the region from very high-resolution satellite imagery. This allows for a consistent definition of urban areas across all countries in the region, overcoming the measurement problems that arise from relying on official definitions of urban areas, which vary markedly across countries. Using this definition, the paper presents evidence on key empirical regularities that are related to disparities across the urban hierarchies, such as the extent of urban primacy and Zipf's law, as well as on the internal structures of cities, such as population density gradients and the number of centers that cities possess. The paper also analyzes how these characteristics are related to key country characteristics. Finally, the paper compares the results with those that arise from the use of an alternative definition of urban areas—the degree of urbanization.

Suggested Citation

  • Pierre-Philippe Combes & Clément Gorin & Shohei Nakamura & Mark Roberts & Benjamin Stewart, 2023. "An Anatomy of Urbanization in Sub-Saharan Africa," Université Paris1 Panthéon-Sorbonne (Post-Print and Working Papers) hal-04345529, HAL.
    • Handle: RePEc:hal:cesptp:hal-04345529
    Note: View the original document on HAL open archive server: https://sciencespo.hal.science/hal-04345529
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    References listed on IDEAS

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    Keywords

    Urbanization; Sub-Saharan Africa; dartboard approach; satellite imagery; population density;
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