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An Interactive Map of Light Pollution
(djlorenz.github.io)
A place for your preferably unique useful or fun sites and kind of a bookmark manager for me :p
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 haven't worked with OSM data before, but you can take a look at the source of the website.