Description: Gridded Population of the World, Version 4 (GPWv4)
Center for International Earth Science Information Network - CIESIN - Columbia University. 2017. Gridded Population of the World, Version 4 (GPWv4): Population Density, Revision 10. Palisades, NY: NASA Socioeconomic Data and Applications Center (SEDAC). https://doi.org/10.7927/H4DZ068D. Accessed 18 April 2018
Copyright Text: NASA SEDAC (http://sedac.ciesin.columbia.edu/data/set/gpw-v4-population-density-rev10)