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SST, Daily Optimum Interpolation (OI), AVHRR Only, Version 2.1, Preliminary, Global, 0.25°, 2020-present

Metadata Updated: June 10, 2023

This is the preliminary, near real time version of the related dataset "ncdcOisst21Agg", which has the final version of these files, which are released about 2 weeks after these NRT files.

NOAA/National Centers for Environmental Information (NCEI) 1/4 Degree Daily Optimum Interpolation Sea Surface Temperature (OISST) Analysis, Version 2.1 - Inter. NOAAs 1/4-degree Daily Optimum Interpolation Sea Surface Temperature (OISST) (sometimes referred to as Reynolds SST, which however also refers to earlier products at different resolution), currently available as version v02r01, is created by interpolating and extrapolating SST observations from different sources, resulting in a smoothed complete field. The sources of data are satellite (Advanced Very High Resolution Radiometer (AVHRR)) and in situ platforms (i.e., ships and buoys), and the specific datasets employed may change over time. At the marginal ice zone, sea ice concentrations are used to generate proxy SSTs. A preliminary version of this file is produced in near-real time (1-day latency), and then replaced with a final version after 2 weeks. Note that this is the AVHRR-ONLY DOISST, available from Oct 1981, but there is a companion DOISST product that includes microwave satellite data, available from June 2002

Access & Use Information

License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

Downloads & Resources


Metadata Date September 3, 2022
Metadata Created Date February 28, 2022
Metadata Updated Date June 10, 2023
Reference Date(s) September 3, 2022 (creation)
Frequency Of Update

Metadata Source

Harvested from Pacific Fisheries Environmental Laboratory

Additional Metadata

Resource Type Dataset
Metadata Date September 3, 2022
Metadata Created Date February 28, 2022
Metadata Updated Date June 10, 2023
Reference Date(s) September 3, 2022 (creation)
Responsible Party NOAA NCEI (Point of Contact)
Contact Email
Guid ncdcOisst21NrtAgg
Access Constraints
Bbox East Long 180.0
Bbox North Lat 89.875
Bbox South Lat -89.875
Bbox West Long -180.0
Coupled Resource [{"title": [], "href": ["#DataIdentification"], "uuid": []}, {"title": [], "href": ["#DataIdentification"], "uuid": []}, {"title": [], "href": ["#DataIdentification"], "uuid": []}]
Frequency Of Update
Harvest Object Id f4e7e754-4d1d-4096-81a6-837b42201868
Harvest Source Id 817069b7-5f4e-4664-9e6b-615af3dfcf2d
Harvest Source Title Pacific Fisheries Environmental Laboratory
Lineage Final file created using preliminary as first guess, and 3 days of AVHRR data. Preliminary uses only 1 day of AVHRR data. New files are downloaded daily from to NOAA NMFS SWFSC ERD by .
Metadata Language eng
Metadata Type geospatial
Old Spatial {"type": "Polygon", "coordinates": [[[-180.0, -89.875], [180.0, -89.875], [180.0, 89.875], [-180.0, 89.875], [-180.0, -89.875]]]}
Spatial Data Service Type ERDDAP griddap
Spatial Reference System
Spatial Harvester True
Temporal Extent Begin 2020-05-04T12:00:00Z
Temporal Extent End 2022-09-02T12:00:00Z

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