Dear Moritz,
thank you for your reply.
I tried with and without the -r flag and the results is the same.
Please find attached the parameters of the file 22giugno2020_b4.txt:
26
6 22 17.05 9.68728523 43.75514951
2
1
0
-0.293
-1000
182
Best regards,
ilaria
-----Messaggio originale-----
Da: Moritz Lennert <[email protected]>
Inviato: giovedì 27 gennaio 2022 13:22
A: Ilaria Ferrando <[email protected]>; Maris Nartiss
<[email protected]>
Cc: GRASS user list <[email protected]>
Oggetto: Re: [GRASS-user] NULL values as output of i.atcorr
On 26/01/22 19:50, Ilaria Ferrando wrote:
> Dear Māris,
> Thank you for your reply.
> Yes, the image is inside the computational region.
> Any other ideas?
1) Are you sure your input data is reflectance (-r flag used) ?
2) Could you provide us with the contents of the 22giugno2020_b4.txt file ?
Moritz
>
> Il mer 26 gen 2022, 19:45 Maris Nartiss <[email protected]
> <mailto:[email protected]>> ha scritto:
>
> One thing to always check – does your computational region contain
> data you are analysing? Try to run `g.region rast=immagine` before
> running i.atcorr.
>
> Māris.
>
> trešd., 2022. g. 26. janv., plkst. 18:13 — lietotājs
> <[email protected] <mailto:[email protected]>>
> rakstīja:
> >
> > Dear all,
> >
> > I am having troubles in processing a Sentinel-2 image with i.atcorr.
> >
> > The command I use is the following:
> >
> > i.atcorr -r -input=immagine@mapset range=0,10000
> parameters=C:\...\22giugno2020_b4.txt output=immagine_atcorr rescale=0,1
> >
> > and I obtain this output:
> >
> > wavelength less than 0.25 micron:
> >
> > let's take s(l)=s(0.25)
> >
> > Atmospheric correction...
> >
> > Atmospheric correction complete.
> >
> >
> >
> > The map I obtain is constituted by pixels with 6.669033e-34 values.
> >
> > Can anyone explain the meaning of the output and why I obtain a
> NULL value corrected map?
> >
> > Thank you for your support.
> >
> >
> >
> > _______________________________________________
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> > [email protected] <mailto:[email protected]>
> > https://lists.osgeo.org/mailman/listinfo/grass-user
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>
>
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