Authored by Andy Nelson, University of Leeds, Leeds, UK. a.d.nelson@leeds.ac.uk and based on previous documentation and methods by Uwe Deichmann, The World Bank, Washington D.C. udeichmann@worldbank.org

Contents

• Introduction
• Part I: Boundary and population data
  • Boundaries
  • Population data
  • Estimation of population figures
  • Census data
  • Additional sources of error
• Part II: Raster data
  • Summary description of the method
  • Construction of the transportation network
  • Setting up urban data
  • Run accessibility calculation
  • Interpolation
  • Adjustment of the accessibility measure
  • Distribution of population
• References
• Download Data
• Appendixes
  • 1. Illustrative example of the stability of population estimates
  • 2. Africa population database - summary table
  • 3. Attribute item definitions
  • 4. Country-specific documentation
  • 5. Map of administrative units in Africa
  • 6. Population density maps for 1960, 1970, 1980, 1990 and 2000
  • 7. Roads used in the accessibility model
  • 8. Populated places used in the accessibility model

---

United Nations Environment Programme Global Resource Information Database Division of Early Warning & Assessment - North America