[GRASS-user] Visibility maps for i.at(mospherically)corr(ecting) Landsat imagery

[Nikos Alexandris]

 Moritz:

> >> If you can't find data, you can always use estimations such as in:
> >> http://dx.doi.org/10.1364/AO.34.002765

Nikos:

> > Thanks Moritz.  Although this looks a bit complex for quickly handcrafting
> > a few scenes, isn't it?

Moritz:

> The idea was not to do your own estimations, but to use those published
> in this article (or others). See table 4 on page 6, where you can find
> the following values for 550nm:

> Tropical (15N): 0.09760
> Midlatitude Summer (45N, July): 0.09745
> Midlatitude Winter (45N, January): 0.09769
> Subartic Summer (60N, July): 0.09688
> Subartic Winter (60N, January): 0.09761
> 1962 U.S. Standard: 0.09721

> Obviously only approximations of mean values, but sometimes better than
> nothing.

Reference added in the wiki -- yet, still a subject to elaborate on.
<http://grasswiki.osgeo.org/wiki/Atmospheric_correction#Atmospheric_correction>

Thank you Moritz, Nikos 
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