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In the by EUMETSAT provided and regularly updated Product Notice for OLCI Level-2 Ocean Colour data, gains for the system vicarious calibration (SVC) are published. These are actually not calculated for the C2RCC processor but can be applied. Actually new gains need to be computed specifically for the C2RCC. For more information see the EUMETSAT Website about the Ocean Colour System Vicarious Calibration Tool.
Assuming that applying these gains is better then than applying no gains, the following graphs show how they can be applied with GPT. For general information about processing with GPT, please take a loo at the Processing page in this wiki.
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For each band an expression is defined like the following
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feq(Oa01_radiance, 913.9812317630276, 1.0e-4) ? NaN : Oa01_radiance * ${Oa01_vic} |
This expression first checks for no-data-value (feq(Oa01_radiance, 913.9812317630276, 1.0e-4)) and sets NaN to the resulting band, if so. If the source value is valid the gain is applied. The variable ${Oa01_vic} is read from the properties file.
The two following property files contain the latest (16. April 2021) gains for OLCI S3A and S3B from the Product Notice.
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