Re: [GRASS-user] i.atcorr with Sentinel2

[Nikos Alexandris]

* Markus Metz <markus.metz.gisw...@gmail.com> [2018-01-23 13:02:27 +0100]:

On Tue, Jan 23, 2018 at 12:25 PM, Stefan Blumentrath <
stefan.blumentr...@nina.no> wrote:

No problem. Any chance I can contribute to maintenance of create_iwave.py?

What needs to be done? Take your latest changes into account?

nodata handling should be changed. In read_input(), missing values should
be set to zero. Then for each band, leading and trailing zeros would be set
to -1. This helps interpolate_band() to get the correct subrange.

For each band, create_iwave.py should print out the band name and the
wavelength as min - max. Care must be taken when finding reasonable min and
max wavelengths: find the max response, then go back while response >
threshold to find the min wavelength. Go forward while response > threshold
to find the max wavelength. As threshold I suggest 0.1 to eliminate noise
in the response values.

Markus M

Thanks Markus for this one (too).  Back in Bonn 2016, I tried to clear
up some of it.  Not exactly the way it had/has to be done as I
understand now.

Nikos

If you think it makes sense I will try to create a patch for adding S2B

to i.atcorr (would be a nice exercise and does not seem too complex)? Will
open a ticket and start working on it unless you tell me different.

Cheers

Stefan







From: grass-user [mailto:grass-user-boun...@lists.osgeo.org] On Behalf Of

Markus Metz

Sent: tirsdag 23. januar 2018 12.03
To: Markus Neteler <nete...@osgeo.org>
Cc: GRASS user list <grass-user@lists.osgeo.org>
Subject: Re: [GRASS-user] i.atcorr with Sentinel2





On Tue, Jan 23, 2018 at 11:51 AM, Markus Neteler <
nete...@osgeo.org> wrote:

>
> On Tue, Jan 23, 2018 at 11:09 AM, Žofie Cimburová
> <
zoficimbur...@gmail.com> wrote:

> > Forgot to cc the list.
> >
> > The CSV and the cpp template:
> >
https://www.dropbox.com/sh/9cnhsl59kvmx4o1/AABwnEVHdxfW_PqrB5Xcpczda?dl=0

>
> Great! Would you mind to also convert the S2A table? AFAIK it got
> updated due to recalibration compared to what we currently have.

please wait a bit with creating the cpp template, create_iwave.py needs

some maintenance

Markus M



>
> markusN
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Nikos Alexandris | Remote Sensing & Geomatics

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