Dataset

IMOS - Satellite Remote Sensing - NOAA20 - 01 day - Diffuse attenuation coefficient (k490)

The NOAA20 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/.

Data and Resources

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Link to OPENDAP server
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Satellite Remote Sensing page on IMOS website
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srs_oc_noaa20_K_490_url/K_490
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WCM

srs_oc_noaa20_K_490_url
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GoGoDuck help documentation
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Access To AWS Open Data Program registry for the Cloud Optimised version of this dataset
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Access to Jupyter notebook to query Cloud Optimised converted dataset
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Website of the Integrated Marine Observing System (IMOS)
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PNG

Unnamed resource
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Unnamed resource
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Additional Information

Field	Value
Published (Metadata Record)	04/03/2026
Last updated	04/03/2026
Organisation	Australian Federal Government
License	License Not Specified
Update Frequency	Unknown