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General Astronomy >> Light Pollution

Pages: 1
Asterous
newbie


Reged: 11/01/13

Loc: Newcastle Upon Tyne
2006 Light pollution map new
      #6169995 - 11/01/13 10:55 AM

I wanted to share a very good Light Pollution map (used by the Clear Sky Chart, and made by David Lorenz) which covers the whole globe. It uses an expanded colour scale and data from 2006, so it should be more accurate than the old World Atlas of the Artificial Night Sky Brightness.

Here is the website
It even has a Google Maps view!

Additionally, the key (from the Clear Sky Chart) with approximate Bortle Scale classes can be found here.


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lamplight
Carpal Tunnel
*****

Reged: 09/18/12

Loc: western MA, U.S.
Re: 2006 Light pollution map new [Re: Asterous]
      #6170520 - 11/01/13 03:27 PM

thanks!

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Illinois
Carpal Tunnel


Reged: 12/18/06

Loc: near Dixon, Illinois USA
Re: 2006 Light pollution map new [Re: lamplight]
      #6171512 - 11/02/13 07:30 AM

Welcome to CN! Nice and details map! Thanks!

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vkhastro1
sage
*****

Reged: 08/21/05

Loc: Ontario, Canada
Re: 2006 Light pollution map new [Re: Illinois]
      #6174689 - 11/03/13 11:40 PM

I live in Vankleek Hill, Ontario. I was just comparing the expanded colour scale maps from DarkSiteFinder.com (2001 data) and the updated maps (2006 data) in the area between Ottawa, Ontario
and Montreal, Quebec.
The dark green colour areas have completely disappeared and light green colour areas have almost completely disappeared (maybe 3% by area left).
If this is accurate, then the night sky is being overwhelmed by light pollution as our urban areas swell and engulf our rural areas. That 5 year comparison
shows this expansion is growing at an alarming rate - a very sorry state indeed!!


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DaveL
member


Reged: 09/30/09

Loc: Madison, WI, USA
Re: 2006 Light pollution map new [Re: vkhastro1]
      #6175211 - 11/04/13 10:57 AM

No, the new 2006 satellite data is more sensitive to dim light sources than previous data. Almost all the differences you're seeing are NOT actual changes in light pollution. See the bottom of my web site:

https://mywebspace.wisc.edu/dlorenz/web/astronomy/lp2006/

BTW, I think the 2006 data seems closer to the original 1996/1997 data because of canceling errors in the 1996/1997 data: the 1996/1997 is less sensitive to dim light sources (makes things seem darker) but contaminated by snow cover (makes things seem brighter).

-Dave


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penguinx64
Pooh-Bah


Reged: 11/12/13

Loc: Holland
Re: 2006 Light pollution map new [Re: DaveL]
      #6202058 - 11/18/13 04:40 PM

Wow, maybe I should move to Mongolia with my telescope!

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George N
Carpal Tunnel
*****

Reged: 05/19/06

Loc: Binghamton & Indian Lake NY
Re: 2006 Light pollution map new [Re: penguinx64]
      #6202701 - 11/18/13 10:24 PM

Quote:

Wow, maybe I should move to Mongolia with my telescope!




It's nice and dark in North Korea.....


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derangedhermit
Pooh-Bah


Reged: 10/07/09

Loc: USA
Re: 2006 Light pollution map new [Re: George N]
      #6206863 - 11/21/13 02:15 AM

Quote:

It's nice and dark in North Korea.....



Well, dark anyway.


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bunyon
Post Laureate
*****

Reged: 10/23/10

Loc: Winston-Salem, NC
Re: 2006 Light pollution map new [Re: penguinx64]
      #6207166 - 11/21/13 09:17 AM

Quote:

Wow, maybe I should move to Mongolia with my telescope!




My wife, not a serious astronomer but very much a lover of a good dark star-filled sky, had the opportunity to spend a couple of nights in the Mongolian desert a few years ago and told me that she wouldn't let me go because she was pretty sure I'd never come back.

I'm sure come winter I would look for an exit but I can see her point.


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jeffpkamp
sage


Reged: 01/11/13

Re: 2006 Light pollution map new [Re: DaveL]
      #6212175 - 11/23/13 08:48 PM

Dave, I'm curious about the central part of russia around noyabrsk, I can't imagine that those gas fields are more lit up than central moscow. I see the same thing on your 2001 data. Just seems odd to me . Maybe they have spot lights at these sites that they just point at the satalite as it flies by...

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DaveL
member


Reged: 09/30/09

Loc: Madison, WI, USA
Re: 2006 Light pollution map new [Re: jeffpkamp]
      #6215026 - 11/25/13 12:30 PM

The light is from gas flaring which pretty much shines in all directions so I think this effect is real. Newer 2012 data shows that the heart of the Bakken formation (NW North Dakota) is now a red and orange zone. I haven't made the 2012 results public because they're contaminated by aurora and the "background" has not been removed, but in the cities and gas flaring regions the artificial effect dominates so this isn't an issue here. The heart of the Bakken light pollution area is a little south of a point between Williston and Minot, ND (say along the Missouri river or something). If someone here is in that area (especially with a Sky Quality Meter (SQM)) then we could confirm if this is real or not.

-Dave


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jeffpkamp
sage


Reged: 01/11/13

Re: 2006 Light pollution map new [Re: DaveL]
      #6217579 - 11/26/13 04:34 PM

I have a cousin in law that works in the natural gas fields in ND, maybe I'll see if I can get him to check him out, just seems like that is a lot of light for gas flaring... but the sats don't lie.

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backwoody
Pooh-Bah


Reged: 01/08/07

Loc: Idaho USA
Re: 2006 Light pollution map [Re: jeffpkamp]
      #6221409 - 11/28/13 12:58 PM

Asterous, thank you for a great post! Clear dark skies,

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careysub
Carpal Tunnel
*****

Reged: 02/18/11

Loc: Rancho Cucamonga, CA
Re: 2006 Light pollution map new [Re: jeffpkamp]
      #6239071 - 12/07/13 01:13 PM

Quote:

Dave, I'm curious about the central part of russia around noyabrsk, I can't imagine that those gas fields are more lit up than central moscow. I see the same thing on your 2001 data. Just seems odd to me . Maybe they have spot lights at these sites that they just point at the satalite as it flies by...




Oh yes. The effect is real.

Unrestricted natural gas flaring from an major field is an enormous light output.The flares are tall, unobstructed and radiate in all directions. In a sense they *do* have spot lights pointed at the satellites, they are the unobstructed gas flares.

I toured the Sinai Peninsula in 1976, over all a very dark sky. But in southern Sinai the light pollution from Egyptian gas flaring near Ras Muhammad was impressive.


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