[GRASS-dev] compile 6S library in GRASS

[Roberta Fagandini]

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.
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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