Re: i.atcorr with Sentinel2

Nikos Alexandris <[email protected]> Wed, 24 Jan 2018 10:14:15 +0100
Newsgroups	gmane.comp.gis.grass.user
Message-ID	<[email protected]>
* Markus Metz <[email protected]> [2018-01-23 13:02:27 +0100]:

>On Tue, Jan 23, 2018 at 12:25 PM, Stefan Blumentrath <
>[email protected]> 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:[email protected]] On Behalf Of
>Markus Metz
>> Sent: tirsdag 23. januar 2018 12.03
>> To: Markus Neteler <[email protected]>
>> Cc: GRASS user list <[email protected]>
>> Subject: Re: [GRASS-user] i.atcorr with Sentinel2
>>
>>
>>
>>
>>
>> On Tue, Jan 23, 2018 at 11:51 AM, Markus Neteler <
>> [email protected]> wrote:
>>
>> >
>> > On Tue, Jan 23, 2018 at 11:09 AM, Žofie Cimburová
>> > <
>> [email protected]> 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
>> > _______________________________________________
>> > grass-user mailing list
>> > [email protected]
>> > https://lists.osgeo.org/mailman/listinfo/grass-user

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-- 
Nikos Alexandris | Remote Sensing & Geomatics
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