[GRASS-user] i.atcorr - range/rescale issues

[Veronica Andreo]

Hi Carlos,

Did you try with rescale=0,1? Or 0,10000 and then divide the result by
10000?

Vero

El mar, 31 ago 2021 a las 16:43, Carlos Henrique Grohmann de Carvalho (<
carlos.grohmann at gmail.com>) escribió:

> Hello all
>
> I'm preparing a tutorial on remote sensing with GRASS (already have 7
> videos - in portuguese - here: https://www.youtube.com/c/SPAMLabUSP)
>
> What I'm planning now is to run i.landsat.toar and i.atcorr, and then
> compare the results with the surface reflectance products from Landsat
> collection 2.
>
> I got it all running but the results are a bit different and it seems that
> the "range" and "rescale" options are the ones to tweak.
>
> checking the metadata:
>
> L2 before scale factor: {'min': '3783', 'max': '65535'}
> L2 after scale factor: {'min': '-0.0959675', 'max': '1.6022125'}
>
> L1 radiance at sensor: {'min': '-6.2', 'max': '191.6'}
>
> L1 reflectance dos1: {'min': '0', 'max': '0.398754597845553'}
>
> L1 reflectance 6S: {'min': '8.560894e-11', 'max': '255'}
>
> I can use the min/max from radiance-at-sensor as the "range" in i.atcorr,
> but what would be best for the "rescale" option? If I don't set it, I end
> up with 0-255
> values. How to get the floating-point result?
>
> thank you for any input
>
>
> Carlos
>
>
> --
> Prof. Carlos Henrique Grohmann
> Institute of Energy and Environment - Univ. of São Paulo, Brazil
> - Digital Terrain Analysis | GIS | Remote Sensing -
>
> http://carlosgrohmann.com
> http://orcid.org/0000-0001-5073-5572
> ________________
> Can’t stop the signal.
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