I only just processed this image after having trouble in the past.
I have a more advanced workflow that is digging out the data in some not so great data sets.
Some of the data was affected by moon nights, others by a bit of cloud and most had bad gradients. Some was fine.
http://www.pbase.com/gregbradley/image/132385515/large
http://www.pbase.com/gregbradley/image/132385590 crop
Not my best image but worth posting.
Greg.