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GHRSST NOAA/STAR Metop-A AVHRR FRAC ACSPO v2.80 0.02 L3U Dataset (GDS version 2)

Published by NOAA National Centers for Environmental Information | National Oceanic and Atmospheric Administration, Department of Commerce | Metadata Last Checked: January 27, 2026 | Last Modified: 2021-11-30T00:00:00.000+00:00
This L3U (Level 3 Uncollated) dataset contains global daily Sea Surface Temperature (SST) on a 0.02 degree grid resolution. It is produced by the National Oceanic and Atmospheric Administration (NOAA) Advanced Clear Sky Processor for Ocean (ACSPO) using L2P (Level 2 Preprocessed) product acquired from the Meteorological Operational satellite A (Metop-A) Advanced Very High Resolution Radiometer 3 (AVHRR/3) in Full Resolution Area Coverage (FRAC) mode as input. It is distributed as 10-minute granules in netCDF-4 format, compliant with the Group for High Resolution Sea Surface Temperature (GHRSST) Data Specification version 2 (GDS2). There are 144 granules per 24-hour interval. Fill values are reported in all invalid pixels, including land pixels with >5 km inland. For each valid water pixel (defined as ocean, sea, lake or river), and up to 5 km inland, the following major layers are reported: SSTs and ACSPO clear-sky mask (ACSM; provided in each grid as part of l2p_flags, which also includes day/night, land, ice, twilight, and glint flags). Only input L2P SSTs with QL=5 were gridded, so all valid SSTs are recommended for the users. Per GDS2 specifications, two additional Sensor-Specific Error Statistics layers (SSES bias and standard deviation) are reported in each pixel with valid SST. Ancillary layers include wind speed and ACSPO minus reference Canadian Meteorological Centre (CMC) Level 4 (L4) SST. The ACSPO Metop-A AVHRR FRAC L3U product is monitored and validated against iQuam in situ data (Xu and Ignatov, 2014) in the NOAA SST Quality Monitor (SQUAM) system (Dash et al, 2010). SST imagery and clear-sky mask are evaluated, and checked for consistency with L2P and other satellites/sensors SST products, in the NOAA ACSPO Regional Monitor for SST (ARMS) system. More information about the dataset is found at AVHRRF_MA-STAR-L2P-v2.80 and in Pryamitsyn et al. (2021).

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Complete Metadata
@type dcat:Dataset
accessLevel non-public
accrualPeriodicity R/P1D
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description This L3U (Level 3 Uncollated) dataset contains global daily Sea Surface Temperature (SST) on a 0.02 degree grid resolution. It is produced by the National Oceanic and Atmospheric Administration (NOAA) Advanced Clear Sky Processor for Ocean (ACSPO) using L2P (Level 2 Preprocessed) product acquired from the Meteorological Operational satellite A (Metop-A) Advanced Very High Resolution Radiometer 3 (AVHRR/3) in Full Resolution Area Coverage (FRAC) mode as input. It is distributed as 10-minute granules in netCDF-4 format, compliant with the Group for High Resolution Sea Surface Temperature (GHRSST) Data Specification version 2 (GDS2). There are 144 granules per 24-hour interval. Fill values are reported in all invalid pixels, including land pixels with >5 km inland. For each valid water pixel (defined as ocean, sea, lake or river), and up to 5 km inland, the following major layers are reported: SSTs and ACSPO clear-sky mask (ACSM; provided in each grid as part of l2p_flags, which also includes day/night, land, ice, twilight, and glint flags). Only input L2P SSTs with QL=5 were gridded, so all valid SSTs are recommended for the users. Per GDS2 specifications, two additional Sensor-Specific Error Statistics layers (SSES bias and standard deviation) are reported in each pixel with valid SST. Ancillary layers include wind speed and ACSPO minus reference Canadian Meteorological Centre (CMC) Level 4 (L4) SST. The ACSPO Metop-A AVHRR FRAC L3U product is monitored and validated against iQuam in situ data (Xu and Ignatov, 2014) in the NOAA SST Quality Monitor (SQUAM) system (Dash et al, 2010). SST imagery and clear-sky mask are evaluated, and checked for consistency with L2P and other satellites/sensors SST products, in the NOAA ACSPO Regional Monitor for SST (ARMS) system. More information about the dataset is found at AVHRRF_MA-STAR-L2P-v2.80 and in Pryamitsyn et al. (2021).
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identifier gov.noaa.nodc:GHRSST-AVHRRF_MA-STAR-L3U
issued 2021-06-05T00:00:00.000+00:00
keyword 
                                            [
  "0235453",
  "0235986",
  "0236807",
  "0237901",
  "0238907",
  "0239181",
  "0239383",
  "0239609",
  "0239910",
  "0240221",
  "0240423",
  "0240725",
  "0240932",
  "0241125",
  "0241342",
  "0241683",
  "0241714",
  "0242081",
  "0242281",
  "0242615",
  "0242958",
  "0243339",
  "SEA SURFACE TEMPERATURE",
  "WIND SPEED",
  "AVHRR-3",
  "satellite data",
  "MetOp-A",
  "NOAA Center for Satellite Applications and Research",
  "NASA JPL PO.DAAC",
  "Group for High Resolution Sea Surface Temperature (GHRSST)",
  "World-Wide Distribution",
  "oceanography",
  "DOC/NOAA/NESDIS/STAR > Center for Satellite Applications and Research, NESDIS, NOAA, U.S. Department of Commerce",
  "NASA/JPL/PODAAC > Physical Oceanography Distributed Active Archive Center, Jet Propulsion Laboratory, NASA",
  "GHRSST > Group for High Resolution Sea Surface Temperature",
  "EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC WINDS > SURFACE WINDS > WIND SPEED",
  "EARTH SCIENCE > OCEANS > OCEAN TEMPERATURE > SEA SURFACE TEMPERATURE",
  "Earth Science > Oceans > Ocean Temperature > Sea Surface Temperature > Sea Surface Skin Temperature",
  "AVHRR-3 > Advanced Very High Resolution Radiometer-3",
  "METOP-A > Meteorological Operational Satellite - A",
  "MetOp-A (ICES code: 064Q, 2006-2016)",
  "GEOGRAPHIC REGION > GLOBAL OCEAN"
]
landingPage https://www.ncei.noaa.gov/contact
language 
                                            []
license https://creativecommons.org/publicdomain/zero/1.0/
modified 2021-11-30T00:00:00.000+00:00
publisher 
                                            {
  "name": "NOAA National Centers for Environmental Information",
  "@type": "org:Organization"
}
references 
                                            [
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  "https://doi.org/10.5281/zenodo.6984989",
  "https://doi.org/10.1117/1.jrs.11.032405",
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  "https://doi.org/10.1175/jtech-d-13-00121.1",
  "https://doi.org/10.1175/2010jtecha1413.1",
  "https://doi.org/10.1175/2010jtecho756.1",
  "https://doi.org/10.3390/rs8040346",
  "https://doi.org/10.1175/jtech-d-10-05023.1",
  "https://www.star.nesdis.noaa.gov/socd/sst/arms/",
  "https://www.star.nesdis.noaa.gov/socd/sst/iquam/",
  "https://www.star.nesdis.noaa.gov/socd/sst/squam/",
  "https://cmr.earthdata.nasa.gov/search/concepts/C2205121413-POCLOUD.html",
  "https://www.ncei.noaa.gov/archive/accession/0123222"
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rights otherRestrictions
spatial 179.99,-89.99,-179.99,89.99
temporal 2021-06-01T00:00:00+00:00/2021-06-01T00:00:00+00:00
title GHRSST NOAA/STAR Metop-A AVHRR FRAC ACSPO v2.80 0.02 L3U Dataset (GDS version 2)

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