On 27/01/22 14:01, ilaria.ferrand...@gmail.com wrote:
Dear Moritz,
thank you for your reply.
I tried with and without the -r flag and the results is the same.
I reformulate this part of the question then: what exactly is the
content of immagine@mapset ? Please provide the output of
r.info map=immagine@mapset
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
Are you sure this should be a negative number ? This should be
visibility in km IIRC.
-1000
182
Moritz
-----Messaggio originale-----
Da: Moritz Lennert <mlenn...@club.worldonline.be>
Inviato: giovedì 27 gennaio 2022 13:22
A: Ilaria Ferrando <ilaria.ferrand...@gmail.com>; Maris Nartiss
<maris....@gmail.com>
Cc: GRASS user list <grass-user@lists.osgeo.org>
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 <maris....@gmail.com
<mailto:maris....@gmail.com>> 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
<ilaria.ferrand...@gmail.com <mailto:ilaria.ferrand...@gmail.com>>
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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