[GRASS-user] NULL values as output of i.atcorr

[Maris Nartiss]

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.ferrando87 at 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 at 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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