[GRASS-dev] compile 6S library in GRASS

Markus Metz markus.metz.giswork at gmail.com
Wed Jun 27 05:24:07 PDT 2018

On Wed, Jun 27, 2018 at 2:16 PM, Roberta Fagandini <robifagandini at gmail.com>
> 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.

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.

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
>>>     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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