4f0fbf75-914d-4ce7-bf72-82ca1e061165 urn:uuid eng UTF-8 nonGeographicDataset nonGeographicDataset 2025-06-23T11:38:15 creation ISO 19115 2016 IMOS - Satellite Remote Sensing - SNPP - 01 day - Diffuse attenuation coefficient (k490) 4f0fbf75-914d-4ce7-bf72-82ca1e061165 The SNPP satellite platform carries a VIIRS sensor that observes sunlight reflected from within the ocean surface layer at multiple wavelengths. These multi-spectral measurements are used to infer the diffuse attenuation coefficient (Kd) at 490nm wavelength which provides information on how light is attenuated in the water column. It is defined as the scaling length of the exponential decrease of the downwelling irradiance, and has units (m^-1). The VIIRS K490 product estimates Kd at 490nm wavelength, using a semi-empirical model based on the ratio of water leaving radiances at 490nm and 555nm. The algorithm is described at https://oceancolor.gsfc.nasa.gov/atbd/kd/. {"type": "Polygon", "coordinates": [[[80.0, -60.0], [179.9, -60.0], [179.9, 10.0], [80.0, 10.0], [80.0, -60.0]]]} 80.0 179.9 -60.0 10.0 Countries | Australia Countries | Fiji Countries | Indonesia Countries | Malaysia Countries | New Caledonia Countries | New Zealand Countries | Papua New Guinea Countries | Philippines Countries | Timor-Leste Countries | Vanuatu Global / Oceans | Indian Ocean Global / Oceans | Pacific Ocean Global / Oceans | Southern Ocean Marine Features (Australia) | Bass Strait, TAS/VIC Marine Features (Australia) | Great Australian Bight, SA/WA Oceans | Ocean Optics | Ocean Color Regional Seas | Arafura Sea Regional Seas | Banda Sea Regional Seas | Celebes Sea Regional Seas | Coral Sea Regional Seas | Java Sea Regional Seas | Philippine Sea Regional Seas | Solomon Sea Regional Seas | Tasman Sea Regional Seas | Timor Sea States, Territories (Australia) | New South Wales States, Territories (Australia) | Northern Territory States, Territories (Australia) | Queensland States, Territories (Australia) | South Australia States, Territories (Australia) | Tasmania States, Territories (Australia) | Victoria States, Territories (Australia) | Western Australia Link to OPENDAP server documentDigital HTML Satellite Remote Sensing page on IMOS website documentDigital HTML srs_oc_snpp_K_490_url/K_490 documentDigital SRS - K490 - WMS layer HTML srs_oc_snpp_K_490_url documentDigital The GoGoDuck subsets and aggregates gridded data. Data is returned as a NetCDF file. WCM GoGoDuck help documentation documentDigital HTML Access To AWS Open Data Program registry for the Cloud Optimised version of this dataset documentDigital HTML Access to Jupyter notebook to query Cloud Optimised converted dataset documentDigital HTML Website of the Integrated Marine Observing System (IMOS) documentDigital HTML Unnamed resource documentDigital License Graphic PNG Unnamed resource documentDigital HTML