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Data processing in sunglint conditions

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Elliptical data gaps within the daily SeaWiFS data.

OC-CCI-v1.0 and v2.0 include elliptical data gaps (also in the NASA daily SeaWiFS Level-3 products) because a HIGLINT flag is applied as a mask at Level-3, which was adopted because the POLYMER atmospheric correction is not currently used for SeaWiFS. The HIGLINT flag started to be used as a mask during the NASA Ocean Color Reprocessing 2009 so that SeaWiFS and MODIS Level-3 data are consistent. Therefore, the original GlobColour ( dataset often does not have these gaps because at the time it was produced this flag was not applied as a mask at Level-3; the GlobColour GLOB_4KM/RAN dataset was originally generated in 2008. It has since been reprocessed (2nd reprocessing) and so now also has these gaps.

Processing under sunglint conditions.

POLYMER is capable of retrieving data under sun glint conditions, which substantially increases the spatial coverage of the MERIS retrieved data. However, in OC-CCI-v1.0 and v2.0, POLYMER was not used for the MODIS or SeaWiFS atmospheric correction, and so data gaps due to glint do occur for these sensors. POLYMER is described in the following document