Posted by: Dirk | April 26, 2009

Travel time to major cities


source: Nelson, A. (2008) Estimated travel time to the nearest city of 50,000 or more people in year 2000. Global Environment Monitoring Unit – Joint Research Centre of the European Commission, Ispra Italy. Available at http://www-tem.jrc.it/accessibility

This is an interesting variation of the earth at night map that I show to my students to explain that economic activity is distributed unevenly:


Earth at Night – source: C. Mayhew & R. Simmon (NASA/GSFC), NOAA/ NGDC, DMSP Digital Archive

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