Another nice site showing light pollution is http://djlorenz.github.io/astronomy/lp2006/ http://djlorenz.github.io/astronomy/lp2006/ The data hasn't been updat

Another nice site showing light pollution is http://djlorenz.github.io/astronomy/lp2006/ http://djlorenz.github.io/astronomy/lp2006/ The data hasn't been updated since 2006 but the change should not be that much different. I've contacted the author in the past, for some technical explanation: The NOAA data is the light source data. It uses the light source data as input to a model of light propagation in the atmosphere to estimate the light pollution. This takes into account that the light pollution from a town or city (or natural gas field!) can affect the level of light pollution at locations far removed from the light source. Technically, my light pollution atlas is the amount of artificial sky brightness at zenith. The site features also an overlay on Google Maps which shows the light pollution. It's a nice tool to find night photo spots. The one I've been using for some time with great results: http://djlorenz.github.io/astronomy/lp2006/overlay/dark.html http://djlorenz.github.io/astronomy/lp2006/overlay/dark.html