[GRASS-dev] compile 6S library in GRASS

[Markus Metz]

On Thu, Jun 28, 2018 at 2:03 PM, Stefan Blumentrath <
Stefan.Blumentrath at nina.no> wrote:
>
> Just one quick follow up question regarding your wild guess:
>
>
>
> With a raster map option, the module would have to make assumptions on
units / scale of values in the map (documented in the manual), so in the
further process e.g. average or median could be extracted (r.univar) and
fed to 6s input file, right?

no, i.atcorr accepts a visibility raster map as input, equivalent to
aerosol optical depth at 550nm.

Note that internally i.atcorr converts AOD at 550nm to visibility with
v = exp(-log(taer55 / 2.7628f) / 0.79902f);

Markus M
>
>
>
> Cheers
>
> Stefan
>
>
>
>
>
> From: grass-dev <grass-dev-bounces at lists.osgeo.org> On Behalf Of Yann
Chemin
> Sent: torsdag 28. juni 2018 13:38
> To: mlennert at club.worldonline.be
> Cc: Markus Metz <markus.metz.giswork at gmail.com>; GRASS-dev <
grass-dev at lists.osgeo.org>; Roberta Fagandini <robifagandini at gmail.com>
> Subject: Re: [GRASS-dev] compile 6S library in GRASS
>
>
>
> a wild guess: specify a raster input option for AOT (alongside other
options), let user find its image source and use it.
>
>
>
> Very limited requirement for the GSoC student, most latitude for the the
modules user.
>
>
>
> ----------
> Dr. Yann Chemin
>
> Freelancer
>
> +33 7 83 85 5234
>
> 3 Toulmelin, 56400 Plumergat, FR
>
> https://www.paypal.me/yannchemin
>
>
>
>
>
> On Thu, 28 Jun 2018 at 13:35, Moritz Lennert <mlennert at club.worldonline.be>
wrote:
>
> On 28/06/18 12:17, Roberta Fagandini wrote:
> > I'm not an expert in MODIS data so if someone wants to give
> > suggestions about how to retrieve the AOT from these data, I will
> > definitely add this option too.
>
> I'm not an expert, and MarkusM can probably provide you with more info,
> but you can already see https://lpdaac.usgs.gov/node/1265.
>
> Moritz
>
>
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