Burki wrote:
> I'm going to leave the discussion topic a bit, but
> just by chance I downloaded the 8km/pixel file of July before I read this
> thread. And as all these Blue Marble pictures are Mercator projections, I
> thought it was a good idea to...

They're not Mercator projections, they're spherical.  (Mercator 
projections are progressively distorted vertically as you approach the 
poles, and approach infinity at the poles themselves.)

> But anyway, I've got two questions:
> These deep sea trenches west of Australia won't show up. Did you made them
> afterwards?

I made a second function of the bathymetric data and added that to the 
earth isosurface, where the function with the topography is subtracted, 
since they're two files each with a full 256 shades of grey and it's a 
shame to not use that full amount by trying to combine the two images 
into one, which would reduce the vertical resolution by half.

> And how did you do the athmosperic rim - a second sphere filled with media?

Yep.  I outline the important particulars in my 'not oops' post dated 
2005-11-10 08:53.

-- 
Tim Cook
http://home.bellsouth.net/p/PWP-empyrean

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