Glenc,
Attached is the Parkes area from Google Maps with bits of both the NASA 'Earthlight' map (
http://antwrp.gsfc.nasa.gov/apod/ap001127.html) and the recent 'sky brightness' map superimposed.
As you can see in this more detailed view, Parkes (arrowed) produces the brightness you'd expect from a town of its size .. but what on earth is causing the big blob (and the one to the NW) 20 km ENE?
I looked at the satellite views of the areas on Google maps but there's nothing obvious there.
Interestingly, there's no sign of any brightly-lit area 20km ENE of Parkes on the NASA 'Earthlight' view, only on the 'sky brightness' map.
Anyone got any ideas?