Data

IMOS - Satellite Remote Sensing - SNPP - 01 day - Diffuse attenuation coefficient (k490)

Australian Ocean Data Network
Integrated Marine Observing System (IMOS)
Viewed: [[ro.stat.viewed]] Cited: [[ro.stat.cited]] Accessed: [[ro.stat.accessed]]
ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=https://catalogue-imos.aodn.org.au:443/geonetwork/srv/api/records/697aa9e7-bf24-4f9e-9950-d5cfd78f1b35&rft.title=IMOS - Satellite Remote Sensing - SNPP - 01 day - Diffuse attenuation coefficient (k490)&rft.identifier=https://catalogue-imos.aodn.org.au:443/geonetwork/srv/api/records/697aa9e7-bf24-4f9e-9950-d5cfd78f1b35&rft.description=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/.Statement: The radiometric sensitivity of the VIIRS sensor is evolving continuously during its mission and is monitored regularly by NASA. The SeaDAS software uses tables of calibration coefficients that are updated periodically. From time to time upgrades to the algorithms and/or the format of the calibration tables are required, in which case a new version of SeaDAS is released. These data were initially being produced using SeaDAS 8.x and more recently, with SeaDAS 9.x. The data are produced by combining the near real time (nrt) data stream from all the available direct broadcast reception stations in Australia with delayed-mode data from NASA in the US. The data have been remapped from satellite projection into a geographic (Latitude/Longitude axes) projection (0.01 degree sampling) and are presented as a sequence of daily mosaics covering the region (80 &rft.creator=Integrated Marine Observing System (IMOS) &rft.date=2025&rft.coverage=westlimit=80.00; southlimit=-60.00; eastlimit=179.90; northlimit=10.00&rft.coverage=westlimit=80.00; southlimit=-60.00; eastlimit=179.90; northlimit=10.00&rft_rights=Creative Commons Attribution 4.0 International License http://creativecommons.org/licenses/by/4.0/&rft_rights=The citation in a list of references is: IMOS [year-of-data-download], [Title], [data-access-URL], accessed [date-of-access].&rft_rights=Any users of IMOS data are required to clearly acknowledge the source of the material derived from IMOS in the format: Data was sourced from Australia’s Integrated Marine Observing System (IMOS) – IMOS is enabled by the National Collaborative Research Infrastructure strategy (NCRIS). If relevant, also credit other organisations involved in collection of this particular datastream (as listed in 'credit' in the metadata record).&rft_rights=Data, products and services from IMOS are provided as is without any warranty as to fitness for a particular purpose.&rft_subject=oceans&rft_subject=OCEAN COLOR&rft_subject=EARTH SCIENCE&rft_subject=OCEANS&rft_subject=OCEAN OPTICS&rft_subject=Global / Oceans | Southern Ocean&rft_subject=Regional Seas | Java Sea&rft_subject=Regional Seas | Philippine Sea&rft_subject=Marine Features (Australia) | Bass Strait, TAS/VIC&rft_subject=Regional Seas | Timor Sea&rft_subject=Regional Seas | Tasman Sea&rft_subject=Regional Seas | Celebes Sea&rft_subject=Regional Seas | Banda Sea&rft_subject=Regional Seas | Arafura Sea&rft_subject=Marine Features (Australia) | Great Australian Bight, SA/WA&rft_subject=Global / Oceans | Pacific Ocean&rft_subject=Regional Seas | Solomon Sea&rft_subject=Global / Oceans | Indian Ocean&rft_subject=Regional Seas | Coral Sea&rft_subject=States, Territories (Australia) | Queensland&rft_subject=Countries | Indonesia&rft_subject=Countries | New Zealand&rft_subject=Countries | Papua New Guinea&rft_subject=States, Territories (Australia) | Northern Territory&rft_subject=Countries | New Caledonia&rft_subject=States, Territories (Australia) | South Australia&rft_subject=States, Territories (Australia) | New South Wales&rft_subject=States, Territories (Australia) | Victoria&rft_subject=Countries | Philippines&rft_subject=Countries | Timor-Leste&rft_subject=Countries | Vanuatu&rft_subject=States, Territories (Australia) | Tasmania&rft_subject=States, Territories (Australia) | Western Australia&rft_subject=Countries | Malaysia&rft_subject=Countries | Fiji&rft_subject=Countries | Australia&rft_subject=SNPP&rft_subject=Light extinction coefficient (490nm wavelength) in the water body&rft_subject=ocean colour radiometers&rft_subject=Ocean Colour Sub-Facility, Integrated Marine Observing System (IMOS)&rft.type=dataset&rft.language=English Access the data
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Licence & Rights:

Open Licence view details
CC-BY

Creative Commons Attribution 4.0 International License
http://creativecommons.org/licenses/by/4.0/

The citation in a list of references is: "IMOS [year-of-data-download], [Title], [data-access-URL], accessed [date-of-access]."

Any users of IMOS data are required to clearly acknowledge the source of the material derived from IMOS in the format: "Data was sourced from Australia’s Integrated Marine Observing System (IMOS) – IMOS is enabled by the National Collaborative Research Infrastructure strategy (NCRIS)." If relevant, also credit other organisations involved in collection of this particular datastream (as listed in 'credit' in the metadata record).

Data, products and services from IMOS are provided "as is" without any warranty as to fitness for a particular purpose.

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Brief description

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/.

Lineage

Statement: The radiometric sensitivity of the VIIRS sensor is evolving continuously during its mission and is monitored regularly by NASA. The SeaDAS software uses tables of calibration coefficients that are updated periodically. From time to time upgrades to the algorithms and/or the format of the calibration tables are required, in which case a new version of SeaDAS is released. These data were initially being produced using SeaDAS 8.x and more recently, with SeaDAS 9.x. The data are produced by combining the near real time (nrt) data stream from all the available direct broadcast reception stations in Australia with delayed-mode data from NASA in the US. The data have been remapped from satellite projection into a geographic (Latitude/Longitude axes) projection (0.01 degree sampling) and are presented as a sequence of daily mosaics covering the region (80 <= Longitude <= 180, -60 <= Latitude <= +10) formatted as CF-compliant netCDF files. It should be noted that the data are not processed until the definitive spacecraft ephemeris becomes available, usually 12-24 hours after the overpass. This means that the geolocation should be of a uniformly high standard. The filenames are of the form V.P1D.yyyymmddThhmmssZ.aust.k_490.nc, where 'V' denotes SNPP/VIIRS, 'yyyymmddThhmmssZ' is the GMT date of the mosaic, 'aust' indicates a whole-of-Australia mosaic and the 'nc' suffix is for netCDF4 format data files. Files are written in netCDF4 format with compression.

Notes

Credit
Australia’s Integrated Marine Observing System (IMOS) is enabled by the National Collaborative Research Infrastructure Strategy (NCRIS). It is operated by a consortium of institutions as an unincorporated joint venture, with the University of Tasmania as Lead Agent.
Credit
CSIRO Oceans and Atmosphere
Credit
Curtin University

Created: 07 02 2025

Data time period: 2022-05-21

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179.9,10 179.9,-60 80,-60 80,10 179.9,10

129.95,-25

text: westlimit=80.00; southlimit=-60.00; eastlimit=179.90; northlimit=10.00

Subjects
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 | EARTH SCIENCE | Global / Oceans | Indian Ocean | Global / Oceans | Pacific Ocean | Global / Oceans | Southern Ocean | Light extinction coefficient (490nm wavelength) in the water body | Marine Features (Australia) | Bass Strait, TAS/VIC | Marine Features (Australia) | Great Australian Bight, SA/WA | Ocean Color | OCEAN OPTICS | OCEANS | Ocean Colour Sub-Facility, Integrated Marine Observing System (IMOS) | 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 | SNPP | 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 | ocean colour radiometers | oceans |

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Other Information
(Satellite Remote Sensing page on IMOS website)

uri : http://imos.org.au/srs.html

SRS - K490 - WMS layer (srs_oc_snpp_K_490_url/K_490)

uri : http://geoserver-123.aodn.org.au/geoserver/ncwms

(GoGoDuck help documentation)

uri : https://help.aodn.org.au/web-services/gogoduck-aggregator/

global : 8209bf83-0c3c-4fbe-9f36-41f7a5ee9913

Identifiers
  • global : 697aa9e7-bf24-4f9e-9950-d5cfd78f1b35
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