[GRASS-user] Radiometric Correction @GRASS6.4

Nikos Dumakis nikosdu1980 at gmail.com
Thu Feb 4 07:36:31 EST 2010


Hello Markus. Thanks for your answers

> As far as I saw, there are no GRASS functions to perform Radiometric

> > Correction.
> There is: i.atcorr.
>
Regarding i.atcorr I thought that the only thing i.atcorr perfoms is the
atmospheric correction, I mean conversion from TOA (top-of-atmosphere) to
BOA (Bottom-of-atmosphere).
But how about the correction of illumination variations and instrument
calibration? 6S also includes this?
(by the way, at i.atcorr manual one of the links (INPE) is dead)
I.atcorr is equal to 6S models provided by Maryland Univ group?

Regarding Geometrical conditions:
- Is it possible to addapt this to a SPOT image or UK-DMC image? I mean
there is a list of pre-defined bands and those satellites, among others, are
not there. But it is possible to apply this model to others satellite
images?


 Yes, please see

> http://grass.osgeo.org/wiki/Atmospheric_correction
>
> Regarding The estimation the overpass time from the sun position:
Is this retrieved information useful for the i.atcorr process right ? and is
this information placed automatically in the ICND file?

Thank you for your help Markus

Best regards
Nikos
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