'''Short description:''' For the '''Global''' Ocean '''Satellite Observations''', ACRI-ST company (Sophia Antipolis, France) is providing '''Chlorophyll-a''' and '''Optics''' products [1997 - present] based on the '''Copernicus-GlobColour''' processor. * '''Chlorophyll''' products are based on a multi sensors/algorithms approach to provide to end-users the best estimate. Two dailies products are distributed: ** one limited to the daily observations (called L3), ** the other based on a space-time interpolation: the '''"Cloud Free"''' (called L4). * '''Optics''' products refer to Reflectance (RRS), Transparency (ZSD), Suspended Matter (SPM), Particulate Backscattering (BBP), Secchi Transparency (ZSD) Diffuse Attenuation (KD490) and Absorption Coef. (ADG/CDM). * The spatial resolution is 4 km. For Chlorophyll, complementary resolutions exist: ** 25 and 100 km at Global level, ** 1 km over the Atlantic (46°W-13°E , 20°N-66°N) for the '''Cloud Free''' product. *Products (Daily, 8-days, Monthly and Climatology) are based on the merging of the sensors SeaWiFS, MODIS-Aqua, MERIS, VIIRSN and OLCI-S3A. For OLCI-S3A, products are also delivered as a single sensor. * Recent products are organized in datasets called NRT (Near Real Time) and long time-series in datasets called REP/MY (Multi-Years). The NRT products are provided one day after satellite acquisition and updated a few days after in Delayed Time (DT) to provide a better quality. An uncertainty is given at pixel level for all products. To find the '''Copernicus-GlobColour''' products in the catalogue, use the search keyword '''"GlobColour"'''. See [http://marine.copernicus.eu/documents/QUID/CMEMS-OC-QUID-009-030-032-033-037-081-082-083-085-086-098.pdf QUID document] for a detailed description and assessment.