[GRASS-dev] [GRASS GIS] #2545: i.atcorr RapidEye band1

[GRASS GIS]

#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>