Colors correspond to ratios between the artificial sky
brightness and the natural sky brightness of:
<0.01 (black), 0.01-0.11 (dark-gray), 0.11-0.33 (blue), 0.33-1 (green),
1-3 (yellow), 3-9 (orange), 9-27 (red), <27 (white).
As you can see, my home is located in a bad area of
light pollution, and it is only getting worse. There has been an
explosion of stores, gas stations, parking lots, homes with street
lights, etc. all within a mile of my house. In the 4 years
that I have been imaging, I have seen a very noticeable increase in the
light pollution in my area. I have a very difficult time now
imaging anywhere other than the zenith, and on brighter objects. I
am now starting to do more narrowband imaging, as it cuts through the
pollution fairly well.
If I had the time, I would like to go to a dark site to
image, but with my family obligations and work, it is not very likely.
Images courtesy of Google Earth and The Royal
Light Pollution measurements Credit: P. Cinzano, F.
Falchi (University of Padova), C. D. Elvidge (NOAA National Geophysical
Data Center, Boulder). Copyright Royal Astronomical Society. Reproduced
from the Monthly Notices of the RAS by permission of Blackwell Science.