[null,null,[],[],[],null,["# Global Ocean Colour: Bio-Geo-Chemical, L4, from Satellite Observations, Transparency, Multi-Sensor, 4KM\n\nDataset Availability\n: 2023-04-01T00:00:00Z--2025-07-25T00:00:00Z\n\nDataset Provider\n:\n\n\n [Copernicus](https://doi.org/10.48670/moi-00279)\n\nCadence\n: 1 Day\n\nTags\n:\n[copernicus](/earth-engine/datasets/tags/copernicus) [marine](/earth-engine/datasets/tags/marine) [oceans](/earth-engine/datasets/tags/oceans) \n\n#### Description\n\nThe Global Ocean Colour (Copernicus-GlobColour) dataset is a Bio-Geo-Chemical\n(BGC) product developed by ACRI-ST. Derived from multiple satellite sources\nlike SeaWiFS, MODIS, and OLCI. It provides a comprehensive range of\noceanographic variables, including: Chlorophyll (CHL),\nPhytoplankton Functional types and sizes (PFT), Primary Production (PP),\nSuspended Matter (SPM), Secchi Transparency Depth (ZSD),\nDiffuse Attenuation (KD490), Particulate Backscattering (BBP),\nAbsorption Coefficient (CDM), Reflectance (RRS) and more.\n\nThis dataset is a global product from the Copernicus Marine Service that\nprovides key information on ocean transparency. It's a gap-free multi-sensor\ndataset that includes two primary layers: KD490, which measures light\nabsorption, and ZSD, a traditional measure of water clarity.\nThis comprehensive, daily product is vital for monitoring marine ecosystems,\nwater quality, and light availability.\n\nDocumentation:\n\n- [User's Guide](https://documentation.marine.copernicus.eu/PUM/CMEMS-OC-PUM.pdf)\n\n- [Quality Information Document](https://documentation.marine.copernicus.eu/QUID/CMEMS-OC-QUID-009-101to104-111-113-116-118.pdf)\n\n- [Copernicus Marine Datastore](https://data.marine.copernicus.eu/products)\n\n### Bands\n\n\n**Pixel Size**\n\n4000 meters\n\n**Bands**\n\n| Name | Units | Pixel Size | Description |\n|---------------------|-------|------------|---------------------------------------------------------------------------------------------------------------------------------------|\n| `KD490` | 1/m | meters | Diffuse attenuation coefficient at 490 nm |\n| `KD490_uncertainty` | % | meters | Diffuse attenuation coefficient at 490 nm - The uncertainty as measured in hundredths of a percent (e.g., a value of 5000 means 50%). |\n| `ZSD` | m | meters | Secchi disk depth Transparency |\n| `ZSD_uncertainty` | % | meters | Secchi disk depth Transparency - The uncertainty as measured in hundredths of a percent (e.g., a value of 5000 means 50%). |\n| `flags` | | meters | Land water mask bit. - 0: Water - 1: Land |\n\n### Terms of Use\n\n**Terms of Use**\n\nThis dataset is released for use under Service Level Agreement (SLA),\nusing the acronym \"CMEMS\" or the shortened name \"Copernicus Marine Service\"\nboth denote the E.U. Copernicus Marine Environment Monitoring Service.\nHighlights and key features of the licence are provided in this document\n[License](https://marine.copernicus.eu/user-corner/service-commitments-and-licence)\n\n### Citations\n\nCitations:\n\n- Copernicus Global Ocean Colour: Global Ocean Satellite Observations,\n ACRI-ST company (Sophia Antipolis, France) is providing Bio-Geo-Chemical\n (BGC) products based on the Copernicus-GlobColour processor.\n [doi:10.48670/moi-00279](https://doi.org/10.48670/moi-00279)\n\n### Explore with Earth Engine\n\n| **Important:** Earth Engine is a platform for petabyte-scale scientific analysis and visualization of geospatial datasets, both for public benefit and for business and government users. Earth Engine is free to use for research, education, and nonprofit use. To get started, please [register for Earth Engine access.](https://console.cloud.google.com/earth-engine)\n\n### Code Editor (JavaScript)\n\n```javascript\nvar dataset =\n ee.ImageCollection('COPERNICUS/MARINE/OC_GLO_BGC/TRANSPARENCY_MULTI_4KM')\n .filter(ee.Filter.date('2025-03-01', '2025-06-01'));\n\nvar ZSD = dataset.select('ZSD');\nvar vis = {\n min: 5.712,\n max: 51.91,\n palette:\n ['D7F9D0', '91CA85', '5AB05D', '129450', '0F7347', '195437', '122414'],\n};\nMap.setCenter(71, 52, 2);\nMap.addLayer(ZSD, vis, 'ZSD');\n```\n[Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/COPERNICUS/COPERNICUS_MARINE_OC_GLO_BGC_TRANSPARENCY_MULTI_4KM) \n[Global Ocean Colour: Bio-Geo-Chemical, L4, from Satellite Observations, Transparency, Multi-Sensor, 4KM](/earth-engine/datasets/catalog/COPERNICUS_MARINE_OC_GLO_BGC_TRANSPARENCY_MULTI_4KM) \nThe Global Ocean Colour (Copernicus-GlobColour) dataset is a Bio-Geo-Chemical (BGC) product developed by ACRI-ST. Derived from multiple satellite sources like SeaWiFS, MODIS, and OLCI. It provides a comprehensive range of oceanographic variables, including: Chlorophyll (CHL), Phytoplankton Functional types and sizes (PFT), Primary Production (PP), Suspended Matter (SPM), Secchi Transparency Depth ... \nCOPERNICUS/MARINE/OC_GLO_BGC/TRANSPARENCY_MULTI_4KM, copernicus,marine,oceans \n2023-04-01T00:00:00Z/2025-07-25T00:00:00Z \n-90 -180 90 180 \nGoogle Earth Engine \nhttps://developers.google.com/earth-engine/datasets\n\n- [](https://doi.org/https://doi.org/10.48670/moi-00279)\n- [](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/COPERNICUS_MARINE_OC_GLO_BGC_TRANSPARENCY_MULTI_4KM)"]]