#2545: i.atcorr RapidEye band1
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Reporter: chrisraa | Owner: grass-dev@…
Type: defect | Status: new
Priority: normal | Milestone: 7.2.2
Component: Imagery | Version: svn-releasebranch72
Resolution: | Keywords: i.atcorr
CPU: Unspecified | Platform: MSWindows 7
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Comment (by neteler):
Replying to [comment:6 craab]:
> I tested the adjustment and it works,
I have backported it in r71053.
> but it is not part of the solution either. However, I traced back the
problem to the optical thickness value, which was to high:
>
> ([https://www.rese-apps.com/pdf/atcor3_manual.pdf\] , page 19)
>
> "If the visibility is assumed too low (optical thickness too high) the
path radiance becomes
> high, and this may cause a physically unreasonable negative surface
refectance. Therefore,
> dark surfaces of low refectance, and correspondingly low radiance
c0+c1DN, are especially
> sensitive in this respect."
>
> I guess the ticket can be closed and I will try to put together a
paragraph for the manual.
Please consider to provide a manual text snippet, even here or as a patch
to the HTML page.
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Ticket URL: <https://trac.osgeo.org/grass/ticket/2545#comment:8>
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