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About this GraphicPopulation Density 1990-2015
The population density grids are derived by dividing the population count grids by the land area grid and represent persons per square kilometer.
Source: These data are distributed by the Socioeconomic Data and Applications Center (SEDAC), located at the Center for International Earth Science Information Network (CIESIN) of Columbia University, NY.
Link: http://sedac.ciesin.columbia.edu/gpw/global.jsp
Major Cities 1990-2015
Major Urban agglomerations through time 1990-2015. The term “urban agglomeration” refers to populations within dense urban areas regardless of their administrative boundaries.
Source: United Nations Population Division. “Urban Agglomerations.” 2009. World Urbanization Prospects. October 1, 2011.
© 2011 National Geographic Maps
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