[wordup] Atlas of the Artificial Night Sky Brightness

[Adam Shand]

Via: The Eristocracy <Eristocracy at merrymeet.com>
From: http://www.lightpollution.it/worldatlas/pages/fig1.htm

The maps of the artificial night sky brightness at zenith at sea level
allow to compare levels of light pollution in the atmosphere, to recognize
more and less polluted areas and to identify the more polluting districts
and the bigger sources.

These maps are intended to show the levels of pollution in the atmosphere
rather than the stellar visibility which is the aim of the other maps
described afterwards. The assumption of sea level and standard clear
atmospherical conditions allows to compare pollution of different areas,
to recognize more polluting sources or darker areas (areas with less light
in the atmosphere and not areas where you see better the stars) without be
confused by the altitude effects.