Tuesday, October 4, 2011

Global Rural-Urban Mapping Project

My demographer friend Joice Melo Vieira came up with another great tip !


Developed by the NASA Socioeconomic Data and Applications Center (SEDAC) operated by CIESINGRUMPv1 is actually a collection of three global data sets (All data sets are available for download):
  1. Population density and population count grids build on SEDAC’s Gridded Population of the World, Version 3 data set (GPWv3), which does not distinguish between urban and rural areas. GRUMPv1 identifies urban areas based in part on observations of lights at night collected by a series of Department of Defense meteorological satellites over several decades.

  2. A geo-referenced database of urban settlements with populations greater than 5,000 persons, which may be downloaded in both tabular and shapefile formats.

  3.  An urban-rural “mask” (urban extents grid,) which identifies those areas of the Earth’s land surface that appear to be urbanized based on a combination of night-time lights, and, where there are no lights, settlement points that are buffered according to population size.
    *GRUMPv1
     also includes four ancillary data sets: land/geographic unit area grids, national boundaries, national identifier grids, and coastlines. All grids are provided at a resolution of 30 arc-seconds (~1km), with population estimates normalized to the years 1990, 1995, and 2000. 

soundtrack for this post: Dog Days Are.

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