[GRASS-dev] compile 6S library in GRASS

[Yann Chemin]

On Wed, Jun 27, 2018, 15:25 Markus Metz <markus.metz.giswork at gmail.com>
wrote:

>
>
> On Wed, Jun 27, 2018 at 3:06 PM, Roberta Fagandini <
> robifagandini at gmail.com> wrote:
> >
> >
> >
> > 2018-06-27 14:24 GMT+02:00 Markus Metz <markus.metz.giswork at gmail.com>:
> >>
> >>
> >>
> >> On Wed, Jun 27, 2018 at 2:16 PM, Roberta Fagandini <
> robifagandini at gmail.com> wrote:
> >> >
> >> > I'm trying to create an automatic procedure to retrieve all the input
> parameters for the control file of i.atcorr.
> >> > I need py6S because I want to automatically read and compute AOT at
> 550nm from an AERONET file.
> >>
> >> With AOT you mean aerosol optical thickness right? This is user input
> to i.atcorr. There are various sources for AOT at 550nm, e.g. MODIS.
> >
> >
> > Right!
> >
> >>
> >>
> >>
> >>
> >> Anyway, it is probably much easier to to write your own routine to read
> the AERONET file and get the corresponding formula for AOT than to fight
> with 51821 lines of Fortran source code that is numerically unstable. Maybe
> I can help with getting AOT at 550nm from an AERONET file avoiding the
> Fortran version of 6S.
> >
> >
> > Ok but I'm not able to create this kind of routine on my own. If
> someone, more expert than me, can help me in translating the 6S/Py6S
> functions I can go on in this way otherwise for me it's easier to use the
> fortran source code.
>
> Apparently the AERONET data are simple CSV files. You can import them with
> r.in.xyz or v.in.ascii.
>
> Still, I think it is up to the user to decide on the source of AOT values.
> AERONET is one of many possible sources.
>


+1


> Markus M
>
>
> > Here [0] a link to my Github repository in which you can find the small
> script that I wrote using the Py6S library to compute AOT at 550nm
> >
> > Roberta
> >
> > [0]
> https://github.com/RobiFag/GRASS_clouds_and_shadows/blob/master/read_aeronet.py
> >
> >>
> >>
> >> Markus M
> >>
> >> >
> >> > 2018-06-27 14:01 GMT+02:00 Moritz Lennert <
> mlennert at club.worldonline.be>:
> >> >>
> >> >> On 27/06/18 13:54, Roberto Marzocchi wrote:
> >> >>>
> >> >>>
> >> >>> Il giorno mer 27 giu 2018 alle ore 13:47 Markus Metz <
> markus.metz.giswork at gmail.com <mailto:markus.metz.giswork at gmail.com>> ha
> scritto:
> >> >>>
> >> >>>     Hi Roberta,
> >> >>>
> >> >>>     On Wed, Jun 27, 2018 at 1:20 PM, Roberta Fagandini
> >> >>>     <robifagandini at gmail.com <mailto:robifagandini at gmail.com>>
> wrote:
> >> >>>      >
> >> >>>      > Hi all!
> >> >>>      > I need to compile the 6S library in GRASS in order to
> install the
> >> >>>     python library Py6S [0].
> >> >>>
> >> >>>     do you really need Py6S? Can't you use i.atcorr instead?
> >> >>>
> >> >>>
> >> >>> She use Py6S to calculate imput for i.atcorr
> >> >>
> >> >>
> >> >> That seems a bit overkill: why use Py6S to then use i.atcorr ? What
> are you trying to get from Py6S ?
> >> >>
> >> >> Moritz
> >> >>
> >> >
> >
> >
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