I have recently made some tests with compensation of atmosphere 
influence in satellite images.  The problem of most high resolution 
satellite images is that the color is influenced differently by the 
atmosphere in different regions of the image and the same surface color 
therefore appears as a different color in different areas of the image. 
  The approach i took is to simply calculate the atmosphere thickness 
for every point of the image from the corresponding height and use that 
for compensation.  More details can be found on:

http://www.imagico.de/pov/earth_atmosphere.html

Attached are two renders from the alps, the first without the 
compensation, the second with it.  Data sources are various Landsat 
scenes for the texture and SRTM + void filling from 
http://www.viewfinderpanoramas.org/ for the elevation.

Other renders using the technique can be seen on the Views-of-the-Earth 
site (http://earth.imagico.de/new.php)

An implementation of the algorithm is available as well but this is not 
a very user friendly program, just a demonstration.

Christoph

-- 
POV-Ray tutorials, include files, Landscape of the week:
http://www.imagico.de/ (Last updated 04 May. 2006)
MegaPOV with mechanics simulation: http://megapov.inetart.net/

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