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Here's part of the 'dark sky' image superimposed on a map of NSW - I was curious to see exactly where the 'dark grey-black' boundaries were located.
Expected this to be an easy job in Photoshop - semitransparent layer on top of base map and just re-size to make big light pollutions coincide with population centres. In fact had to use 'warp' transform (CS2) - the scale seemed to vary from place to place, but not in any way that seemed to do with different map projections.
The NSW composite map took an hour ... tried it with the whole of Australia but gave up - too many misalignments to cope with!
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