IMOS - Satellite Remote Sensing - NOAA20 - 01 day - Chlorophyll-a concentration (OCI model)

Phytoplankton biomass and diversity Hard coral cover and composition Ocean colour

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 concentration of chlorophyll-a (Chl-a), most typically due to phytoplankton, present in the water.

There are multiple retrieval algorithms for estimating Chl-a. These data use the OCI method (Hu et al 2012, doi: 10.1029/2011jc007395) recommended by the NASA Ocean Biology Processing Group and implemented in the SeaDAS processing software l2gen. The OCI algorithm is described at https://oceancolor.gsfc.nasa.gov/atbd/chlor_a/ (and links therein).

Data and resources

Link to OPENDAP server

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Satellite Remote Sensing page on IMOS website

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srs_oc_noaa20_chl_oci_url/chl_oci

SRS - OCI - WMS layer

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srs_oc_noaa20_chl_oci_url

The GoGoDuck subsets and aggregates gridded data. Data is returned as a NetCDF file.

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GoGoDuck help documentation

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srs_oc_noaa20_chl_oci_url#file_url

The ncUrlList is a WFS service that returns a list of URLs matching a query.

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ncUrlList 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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License Graphic

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Additional information

Temporal extent	2022-05-21 – ongoing
Date (creation)	2025-02-07
Status	onGoing
Update frequency	asNeeded
Metadata language	en
License	Data, products and services from IMOS are provided "as is" without any warranty as to fitness for a particular purpose.
Source metadata	ISO 19115 XML
Last updated	2026-11-05
Created	2026-11-05
API	package_show