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The light pollution map has two base layers (road and hybrid Bing maps), VIIRS/DMSP/World Atlas overlays and the user measurements overlay.
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