Dear Markus, thanks for your reply, this is exactly what I need to know! Best, Zofie
On Fri, Dec 15, 2017 at 5:09 PM, Markus Neteler <nete...@osgeo.org> wrote: > > On Dec 15, 2017 3:54 PM, "Žofie Cimburová" <zoficimbur...@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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