Here are good resources to find dark areas:
darksitefinder.com/maps.html (world coverage but not really detailed)
http://avex-asso.org/dossiers/pl/france/zoom/cdf-normale.htm... (France only, very detailed)
darksitefinder.com/maps.html (world coverage but not really detailed)
http://avex-asso.org/dossiers/pl/france/zoom/cdf-normale.htm... (France only, very detailed)
He can generate clear sky charts for most of Canada and the U.S. You can see light pollution maps and there are links to this Google Maps light pollution overlay:
http://djlorenz.github.io/astronomy/lp2006/overlay/dark.html