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jshine
member
Reged: 07/26/07
Posts: 57
Loc: Rochester, MN, USA
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Re: Google Maps meets Light Pollution
05/20/08 01:35 PM
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Quote:
Very nice I did something like this for the UK last year but it didnt really work out very well. I had problems with overlaying the images so they would be over the correct parts of the country. I thought it may have been a projection issue as I think I was using a satelite image.
Like this http://www.roe.ac.uk/roe/support/pr/pressreleases/070117-darkskylaunch/darksky01.jpg
Did you encounter simmilar problems with your implementation?
Alex
I was extremely lucky in the sense that the map I downloaded (from an Italian research team) had the same projection as the map that Google uses. In your case (and bear in mind that I'm not a cartographer either), you could try applying a 2-D transformation matrix:
http://en.wikipedia.org/wiki/Transformation_matrix#Examples_in_2D_graphics
This would be easily accomplished in Matlab (expensive, but commonly found in universities). I'm not sure it would work -- I'd have to read more about the particulars of the projections in question -- but my intuition says it should.
Since the team that I downloaded my image from also has maps for Europe, Asia, S. America, etc., I would like to extend my site's functionality to those areas as well. ...but with all the projects that I have to work on as part of my degree, I don't have time to make those modifications. 
-Jon
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