Urban expansion and form changes across African cities with a global outlook: Spatiotemporal analysis of urban land densities

Gang Xu, Ting Dong, Patrick Brandful Cobbinah, Limin Jiao, Neema S. Sumari, Baohui Chai, Yaolin Liu

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Africa has been experiencing rapid urbanization, yet limited studies have systematically investigated urban growth dynamics across African cities. Using 25 cities as cases, we quantified urban growth and form changes in Africa via spatiotemporal analysis of urban land densities in concentric rings over three time points (1990, 2000, and 2014). The results show that African cities have rapidly grown both in population and built-up areas, which increased by about 4% and more than 5% per annum, respectively. Urban land density (defined as the proportion of the built-up area to the buildable area) in each concentric ring decreases from the city center to the urban periphery with diverse patterns among cities. Comparatively, small cities have a lower urban land density and a more dispersed urban form than medium-sized and large cities in Africa. The international comparisons between cities with over one million population in Africa, Asia (e.g., China and India), Europe, and North America (i.e., the United States) reveal that African cities have a relatively less compact urban form. Implications of these findings for the future of African cities are further proffered.

Original languageEnglish
Pages (from-to)802-810
Number of pages9
JournalJournal of Cleaner Production
Volume224
Early online date27 Mar 2019
DOIs
Publication statusPublished - 01 Jul 2019

Fingerprint Dive into the research topics of 'Urban expansion and form changes across African cities with a global outlook: Spatiotemporal analysis of urban land densities'. Together they form a unique fingerprint.

  • Cite this