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I'm sorry to be a wet blanket but I don't think this is an image. I think it is generated from some data source. I tried to search Bert Christensen's site for more details but ran out of patience.
My evidence? The errors I can see. If you look in central Oz you'll find Alice and Ulluru; so what is that sse of Ulluru? Now look at the top of WA near Joseph Bonaparte Gulf. I see Kununurra and Halls Creek but HC is brighter than Kununurra and Wyndum is missing. If you can see Halls Creek, where is Birdsville? I can find Derby and Broome but not Port Headland or Karatha. And the Rabbit Flat roadhouse rates two dots.
Of course the pattern shown is generally correct. You wouldn't want to live in Japan, Western Europe or most of the USA; darkest Africa still exists and the Amazon Basin is unlit. But I wonder about the outline around northern India, what are the two bright dots east of Madagascar, and if Rabbit Flat can be seen why is nothing visible in the Antarctica. I wonder about these things....
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