Light Pollution Map

[Ingo]

Does anybody have a light pollution map overlay for USA like the Australia one? It's a neat idea & I love the way the Australia one is made. :thumbsup:

[erick]

Ingo, it's on the same site, here is the link:-

http://www.lightpollution.it/worldatlas/pages/fig2.htm

Enjoy!

[Ingo]

How do you get the big map, or overlay for the united states? All I see if the tiny ones & I really can't zoom in.

Edit: found the TIFF map, but no overlay for google earth =(

[huckabuck]

hey ingo, theres one on sky clock

[Ingo]

What's Sky Clock? :shrug:

[erick]

Ingo, I hope the dot points in our article are clear?

You need to download and then open the big TIFF file in a suitable graphics program, nothing fancy but one that will take that size of file, zoom in to your area of interest, select the area you want to use, than cut it out and get it saved as a .jpg file. Then this is the file you insert as the overlay.

Eric

[Ingo]

How do I get it sized right?:shrug:

[Omaroo]

This one's wierd..... how come there's an enourmous light source in the middle of the ocean just south of Orbost in Victoria? Do we question its accuracy?

Cheers
Chris

[erick]

See dot Point 5 in the article - once the file is inserted over the Google map, you should be able to drag it around and resize it using the corners?

[erick]

Chris, if you look off Exmouth in WA and between WA/NT and Indonesia, you'll see similar light patches. It will be offshore oil and gas facilities. I am rather amazed at the Bass Strait light intensity however, they surely shouldn't be flaring much gas, unlike some places off the WA coast. Eric

[Omaroo]

I thought that too Eric - however I'm thinking that an oil refining facility a quarter the size of the greater Melbourne area has to be a whopper!

[Bobj]

This one's wierd..... how come there's an enourmous light source in the middle of the ocean just south of Orbost in Victoria?

Would they be drilling rigs??
http://www.lakesoil.com.au/P47V.html

[Omaroo]

That was never in question. I still reckon that the map indicates an inordinate amount of light for a few oil rigs. They are football field-sized, and even that there a few of them I wouldn't have thought they'd produce so much light - but I'm probably wrong.