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2001. National Geophysical and Solar-Terrestrial Data Center. This map shows light sources from human settlements around the world observed during 2001. The Defense Meteorological Satellite Program (DMSP) Oper... National Geophysical and Solar-Terrestrial Data Center.
1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, and 2004. National Center for Ecological Analysis and Synthesis. This raster dataset shows the intensity of ultraviolet (UV) radiation reaching the surface of Earth from August 1996 to July 2004 as part of the GS... Science.