Hi
Look at this link:
https://mywebspace.wisc.edu/dlorenz/web/astronomy/lp2006/overlay/dark.html
This has the full light pollution atlas of the world overlayed over
Google maps. This makes it easy to find good observing sites.
Fortunately, the larger darkest sky regions in South India seem to be
in Karnataka. However, they all seem to be up in the ghats were
humidity can be a severe problem.
In any case, ignoring that problem, it looks like Keemale Estates
(near Karada, Coorg) isn't as awesome as I had thought it was.
According to this map, the following places are very dark:
1. Agumbe
2. Sharavati Valley region / Linganamakki reservoir [Note: Jog Falls
is not good! I have been there when there were clouds and the heavy
lighting at Jog Falls is a major detriment to observing. This can also
be seen clearly on the map.]
3. Areas between Kumta and Sirsi. I have friends from Kumta and Sagara
(which is near Linganamakki reservoir), and I wonder if they have
relatives nearby.
4. Idgundi (this seems familiar for some reason)
5. Tala Kaveri area
If anyone can look at the map and suggest observing locations near and
in the "transparent" (black / gray) regions, that would be a great
help!!
Regards
Akarsh