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SVC with POLYMER v4.10 for OLCI-A
Posted: Tue Mar 05, 2019 8:55 am
by MohMograne
Dear all,
I have question about the updated SVC of OLCI-A. Which water case (Case 1 or Case 2) has been used to compute the SVC gains ?
Regards,
Mohamed
Re: SVC with POLYMER v4.10 for OLCI-A
Posted: Tue Mar 05, 2019 9:16 am
by fsteinmetz
Hi Mohamed,
Case 1 matchups over MOBY and BOUSSOLE have been used for OLCI Polymer SVC (and all Polymer SVC, actually).
Kind regards,
François
Re: SVC with POLYMER v4.10 for OLCI-A
Posted: Wed Mar 11, 2020 9:43 am
by jcardoso
Dear François,
I saw inside the Polymer folders one file called "params.py" and inside it are the "# OLCI vicarious calibration coefficients (in dev, bands 1 to 21)".
I would like to ask you some questions concerning the OLCI SVC:
1) This values are the SVC applied to OLCIA and OLCIB?
2) How Polymer does to not apply the same OLCIA SVC coefficients in the OLCIB files?
3) I am running the Polymer v4.11. Are some update related with the OLCI SVC in the v4.12 that I should change to the last version?
Thank you very much for the help,
Joao Santos.
Re: SVC with POLYMER v4.10 for OLCI-A
Posted: Thu Mar 12, 2020 2:25 pm
by fsteinmetz
Dear Joao,
Indeed, the same SVC gains are applied to both OLCI instruments because specific gains for OLCI-B have not yet been generated.
However in v4.11, the gains were set to 1, as you can see on line 332 (self.calib=None). The variable `calib_OLCI_VC` on line 55 is not used actually.
In v4.12, the SVC gains are defined, but identically for OLCI-A and OLCI-B. So yes, I advise to use the latest version.
If you want to pass your own calibration coefficients, you can pass the option calib={400: 1.0, ...} (following the parameter self.calib defined in params.py) to the function run_atm_corr.
Kind regards,
François