[GRASS-user] i.atcorr with Sentinel2

[Markus Neteler]

On Dec 15, 2017 3:54 PM, "Žofie Cimburová" <zoficimburova at gmail.com> wrote:
>
> Dear all,
> I am trying to use i.atcorr (GRASS 7.4) to apply atmospheric corrections
for Sentinel 2 data. The documentation provides a great help, but there are
two points I am not sure about -
>
> - I don't need the atmospheric correction to be applied to the whole
scene, so I only imported a small clip of the scene to GRASS. What
longitude and latitude shall I then specify in the 6S parameters?

I'd use the center coordinates of the clipped area.

> Or is it necessary to apply the corrections to the entire scene?

No since it is a pixel based algorithm.

> - How can I estimate the value of visibility (aerosol model
concentration)?

There are AERONET data online somewhere which might be the best choice.

Markus
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