I wanted to add this map as an overlay map in Osmand to find good camping spots for night sky viewing. I have the USGS land management data as an overlay, and wanted both. Never got around to it, but now maybe I will. I see there's an OSM version of this map, I wonder if I could just download it and load it in?
I knew about the high levels of light pollution in the Netherlands and Belgium but Moscow is what really surprised me on this map. I never would've expected it to be so high. Looks like it has the highest levels outside of China.