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Originally Posted by iceman
I used known crater sizes, and measured the length of those craters in pixels. Simple maths after that 
I compared both the width of Janssen (190km) as well as the width of the Rille (5km at the wide part and 2km at the narrow part), and they both came out accurate (given the metres/px) so i'm pretty sure it's close to accurate. |
Thanks for the details Mike. I guess that at the Moon's central meridian (whatever it's called) that should be okay, but as you get towards the limb, there is increasing foreshortening in one direction, so using the non-foreshortened dimension will help with accuracy.
Cheers
Dennis