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The light pollution map has two base layers (road and hybrid Bing maps), VIIRS/World Atlas/Clouds overlays and a point feature overlay (SQM, SQC and Observatories).Direct annual comparisons are to be avoided as there are too many factors involved. If you want an analysis of radiance (VIIRS/DMSP) changes over a period of time, then please use the Lighttrends application For more information view the help Send comments about the map to Jurij Stare This website uses cookies for targeted advertising and to ensure you get the best experience. If you close this notice or/and browse this website, you agree to accepting these cookies. Read more about cookies in this sites' privacy policy