1992. National Geophysical and Solar-Terrestrial Data Center. This map shows the four types of light sources as observed during 1992. The Defense Meteorological Satellite Program (DMSP) Operational Linescan Sy... National Geophysical and Solar-Terrestrial Data Center.
    
  
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      1993. National Geophysical and Solar-Terrestrial Data Center. This map shows light sources from human settlements around the world observed during 1993. The Defense Meteorological Satellite Program (DMSP) Oper... National Geophysical and Solar-Terrestrial Data Center.
    
  
    
      1994. National Geophysical and Solar-Terrestrial Data Center. This map shows light sources from human settlements around the world observed during 1994. The Defense Meteorological Satellite Program (DMSP) Oper... National Geophysical and Solar-Terrestrial Data Center.
    
  
    
      1994. National Geophysical and Solar-Terrestrial Data Center. The Defense Meteorological Satellite Program (DMSP) Operational Linescan System (OLS) has a unique low-light imaging capability. developed for the ... National Geophysical and Solar-Terrestrial Data Center.
    
  
    
      1992. National Geophysical and Solar-Terrestrial Data Center. This map shows the four types of light sources as observed during 1992. The Defense Meteorological Satellite Program (DMSP) Operational Linescan Sy... National Geophysical and Solar-Terrestrial Data Center.
    
  
    
      1992. National Geophysical and Solar-Terrestrial Data Center. This map shows the four types of light sources as observed during 1992. The Defense Meteorological Satellite Program (DMSP) Operational Linescan Sy... National Geophysical and Solar-Terrestrial Data Center.
    
  
    
      1997. National Geophysical and Solar-Terrestrial Data Center. This map shows light sources from human settlements around the world observed during 1997. The Defense Meteorological Satellite Program (DMSP) Oper... National Geophysical and Solar-Terrestrial Data Center.
    
  
    
      1998. National Geophysical and Solar-Terrestrial Data Center. This map shows light sources from human settlements around the world observed during 1998. The Defense Meteorological Satellite Program (DMSP) Oper... National Geophysical and Solar-Terrestrial Data Center.
    
  
    
      1999. National Geophysical and Solar-Terrestrial Data Center. This map shows light sources from human settlements around the world observed during 1999. The Defense Meteorological Satellite Program (DMSP) Oper... National Geophysical and Solar-Terrestrial Data Center.
    
  
    
      2000. National Geophysical and Solar-Terrestrial Data Center. This map shows light sources from human settlements around the world observed during 2000. The Defense Meteorological Satellite Program (DMSP) Oper... National Geophysical and Solar-Terrestrial Data Center.