Daily R data from OC-CCI were matched in time (daily temporal matchup) and space (latitude and longitude, closest 4 km pixel) with in situ chlorophyll data. for all in situ data, but particularly the underway cruises (Tara and MIPOT),when one or more in situ samples were matched to the same satellite pixel, the in situ chlorophyll concentrations were averaged () and considered as a single match-up.