#2545: i.atcorr RapidEye band1
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Reporter: chrisraa | Owner: grass-dev@…
Type: defect | Status: new
Priority: normal | Milestone: 7.2.1
Component: Imagery | Version: svn-releasebranch72
Resolution: | Keywords: i.atcorr
CPU: Unspecified | Platform: MSWindows 7
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Comment (by craab):
I tested the adjustment and it works, 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.
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Ticket URL: <https://trac.osgeo.org/grass/ticket/2545#comment:6>
GRASS GIS <https://grass.osgeo.org>