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Dataset Overview | National Centers for Environmental Information (NCEI)

GHRSST NOAA/STAR Metop-A AVHRR FRAC ACSPO v2.80 1km L2P Dataset (GDS version 2)

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The MetOp First Generation (FG) is a European multi-satellite program jointly established by ESA and EUMETSAT, comprising three satellites, MetOp-A, -B and -C. The primary sensor onboard MetOp-FG, the Advanced Very High Resolution Radiometer/3 (AVHRR/3) contributed by NOAA, measures Earth emissions and reflectances in 5 out of 6 available bands (centered at 0.63, 0.83, 1.61, 3.7, 11 and 12 microns), in a swath of 2,600km from an 817km altitude. These data are collected in a Full Resolution Area Coverage (FRAC) mode, with pixel size of 1.1km at nadir. MetOp-A launched on 19 October 2006 is the first in the MetOp-FG series. The NOAA Advanced Clear-Sky Processor for Ocean (ACSPO) Level 2 Preprocessed (L2P) SST product is derived at the full AVHRR FRAC resolution and reported in 10 minute granules in NetCDF4 format, compliant with the GHRSST Data Specification version 2 (GDS2). Subskin SSTs are derived using the regression Nonlinear SST (NLSST) algorithm, which employs three bands (3.7, 11 and 12 microns) at night and two bands (11 and 12 microns) during the day. The ACSPO AVHRR FRAC L2P product is monitored and validated against quality controlled in situ data, provided by the NOAA in situ SST Quality Monitor system (iQuam; Xu and Ignatov, 2014, https://doi.org/10.1175/JTECH-D-13-00121.1), in another NOAA system, SST Quality Monitor (SQUAM; Dash et al, 2010, https://doi.org/10.1175/2010JTECHO756.1). SST imagery and clear-sky masking are continuously evaluated, and checked for consistency with other sensors and platforms, in the ACSPO Regional Monitor for SST (ARMS) system. MetOp-A orbital characteristics and AVHRR/3 sensor performance are tracked in the NOAA 3S system (He et al., 2016, https://doi.org/10.3390/rs8040346). The L2P Near Real Time (NRT) SST files are archived at PO.DAAC with 3-6 hours latency, and then replaced by the Re-ANalysis (RAN) SST after about 2 months later with identical file names. Two features can be used to identify them: different file name time stamps and netCDF global attribute metadata source=NOAA-NCEP-GFS for NRT and source=MERRA-2 for RAN. A reduced size (0.45GB/day), equal-angle gridded (0.02-deg resolution) ACSPO L3U product is also available.
  • Cite as: Pryamitsyn, Victor; Petrenko, Boris; Ignatov, Alexander; Kihai, Yury (2021). GHRSST NOAA/STAR Metop-A AVHRR FRAC ACSPO v2.80 1km L2P Dataset (GDS version 2). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/am4h-a956. Accessed [date].
gov.noaa.nodc:GHRSST-AVHRRF_MA-STAR-L2P
Download Data
  • THREDDS (download)
    These data are available through a variety of services via a THREDDS (Thematic Real-time Environmental Distributed Data Services) Data Server (TDS). Depending on the dataset, the TDS can provide WMS, WCS, DAP, HTTP, and other data access and metadata services as well. For more information on the TDS, see http://www.unidata.ucar.edu/software/thredds/current/tds/.
  • HTTPS (download)
    Navigate directly to the URL for data access and direct download.
  • FTP (download)
    These data are available through the File Transfer Protocol (FTP). FTP is no longer supported by most internet browsers. You may copy and paste the FTP link to the data into an FTP client (e.g., FileZilla or WinSCP).
Distribution Formats
  • netCDF (Version: netCDF-4)
    • File Specification: GDS-2.0, ACDD-1.3, CF-1.7
Ordering Instructions Contact NCEI for other distribution options and instructions.
Distributor NOAA National Centers for Environmental Information(link is external)
+1-301-713-3277
ncei.info@noaa.gov
Dataset Point of Contact NOAA National Centers for Environmental Information(link is external)
ncei.info@noaa.gov
Time Period 2021-06-01 to Present
Spatial Bounding Box Coordinates
West: -180
East: 180
South: -90
North: 90
Spatial Coverage Map
General Documentation
Associated Resources
Publication Dates
  • publication: 2021-06-05
  • revision: 2021-12-01
Data Presentation Form Digital table - digital representation of facts or figures systematically displayed, especially in columns
Dataset Progress Status Ongoing - data is continually being updated
Historical archive - data has been stored in an offline storage facility
Data Update Frequency Daily
Supplemental Information
This collection includes data from the following product(s): GHRSST NOAA/STAR Metop-A AVHRR FRAC ACSPO v2.80 1km L2P Dataset (GDS v2) (AVHRRF_MA-STAR-L2P-v2.80).
Purpose This dataset is available to the public for a wide variety of uses including scientific research and analysis.
Use Limitations
  • accessLevel: Public
  • Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives.
Theme keywords NODC DATA TYPES THESAURUS NODC OBSERVATION TYPES THESAURUS WMO_CategoryCode
  • oceanography
Global Change Master Directory (GCMD) Science Keywords
Data Center keywords NODC COLLECTING INSTITUTION NAMES THESAURUS NODC SUBMITTING INSTITUTION NAMES THESAURUS Global Change Master Directory (GCMD) Data Center Keywords
Platform keywords NODC PLATFORM NAMES THESAURUS Global Change Master Directory (GCMD) Platform Keywords ICES/SeaDataNet Ship Codes
Instrument keywords NODC INSTRUMENT TYPES THESAURUS Global Change Master Directory (GCMD) Instrument Keywords
Place keywords NODC SEA AREA NAMES THESAURUS Global Change Master Directory (GCMD) Location Keywords
Project keywords NODC PROJECT NAMES THESAURUS Global Change Master Directory (GCMD) Project Keywords
Keywords NCEI ACCESSION NUMBER
Use Constraints
  • Cite as: Pryamitsyn, Victor; Petrenko, Boris; Ignatov, Alexander; Kihai, Yury (2021). GHRSST NOAA/STAR Metop-A AVHRR FRAC ACSPO v2.80 1km L2P Dataset (GDS version 2). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/am4h-a956. Accessed [date].
Access Constraints
  • Use liability: NOAA and NCEI cannot provide any warranty as to the accuracy, reliability, or completeness of furnished data. Users assume responsibility to determine the usability of these data. The user is responsible for the results of any application of this data for other than its intended purpose.
Fees
  • In most cases, electronic downloads of the data are free. However, fees may apply for custom orders, data certifications, copies of analog materials, and data distribution on physical media.
Lineage information for: series
Processing Steps
  • 2021-06-05T04:50:19Z - NCEI Accession 0235457 v1.1 was published.
  • 2021-06-06T19:39:32Z - NCEI Accession 0235457 was revised and v2.2 was published.
  • 2021-06-12T13:45:17Z - NCEI Accession 0235989 v1.1 was published.
  • 2021-06-14T16:06:01Z - NCEI Accession 0235457 was revised and v3.3 was published.
  • 2021-06-18T19:36:33Z - NCEI Accession 0235989 was revised and v2.2 was published.
  • 2021-06-19T13:44:15Z - NCEI Accession 0236810 v1.1 was published.
  • 2021-06-26T19:20:18Z - NCEI Accession 0237904 v1.1 was published.
  • 2021-06-30T14:06:33Z - NCEI Accession 0236810 was revised and v2.2 was published.
  • 2021-07-01T15:21:36Z - NCEI Accession 0237904 was revised and v2.2 was published.
  • 2021-07-04T15:39:08Z - NCEI Accession 0235989 was revised and v3.3 was published.
  • 2021-07-07T13:56:22Z - NCEI Accession 0238917 v1.1 was published.
  • 2021-07-10T19:43:16Z - NCEI Accession 0237904 was revised and v3.3 was published.
  • 2021-07-14T21:06:00Z - NCEI Accession 0239191 v1.1 was published.
  • 2021-07-14T23:51:48Z - NCEI Accession 0238917 was revised and v2.2 was published.
  • 2021-07-19T19:34:29Z - NCEI Accession 0239191 was revised and v2.2 was published.
  • 2021-07-21T13:40:13Z - NCEI Accession 0239388 v1.1 was published.
  • 2021-07-24T19:44:35Z - NCEI Accession 0239191 was revised and v3.3 was published.
  • 2021-07-25T19:38:29Z - NCEI Accession 0239388 was revised and v2.2 was published.
  • 2021-07-28T13:45:13Z - NCEI Accession 0239617 v1.1 was published.
  • 2021-07-29T13:41:34Z - NCEI Accession 0239388 was revised and v3.3 was published.
  • 2021-08-01T13:34:27Z - NCEI Accession 0239617 was revised and v2.2 was published.
  • 2021-08-05T14:03:11Z - NCEI Accession 0239617 was revised and v3.3 was published.
  • 2021-08-07T13:44:18Z - NCEI Accession 0239916 v1.1 was published.
  • 2021-08-12T13:36:56Z - NCEI Accession 0239916 was revised and v2.2 was published.
  • 2021-08-14T13:40:21Z - NCEI Accession 0240223 v1.1 was published.
  • 2021-08-17T19:33:56Z - NCEI Accession 0239916 was revised and v3.3 was published.
  • 2021-08-19T23:50:34Z - NCEI Accession 0240223 was revised and v2.2 was published.
  • 2021-08-21T13:40:14Z - NCEI Accession 0240428 v1.1 was published.
  • 2021-08-26T13:40:30Z - NCEI Accession 0240428 was revised and v2.2 was published.
  • 2021-08-29T19:36:29Z - NCEI Accession 0240428 was revised and v3.3 was published.
  • 2021-08-30T15:17:52Z - NCEI Accession 0240223 was revised and v3.3 was published.
  • 2021-09-01T13:43:22Z - NCEI Accession 0240728 v1.1 was published.
  • 2021-09-06T13:33:30Z - NCEI Accession 0240728 was revised and v2.2 was published.
  • 2021-09-08T13:40:20Z - NCEI Accession 0240937 v1.1 was published.
  • 2021-09-11T14:21:31Z - NCEI Accession 0240728 was revised and v3.3 was published.
  • 2021-09-12T19:37:27Z - NCEI Accession 0240937 was revised and v2.2 was published.
  • 2021-09-15T13:44:22Z - NCEI Accession 0241134 v1.1 was published.
  • 2021-09-18T19:35:34Z - NCEI Accession 0240937 was revised and v3.3 was published.
  • 2021-09-22T13:43:11Z - NCEI Accession 0241349 v1.1 was published.
  • 2021-09-24T21:20:39Z - NCEI Accession 0241134 was revised and v2.2 was published.
  • 2021-10-02T13:39:45Z - NCEI Accession 0241349 was revised and v2.2 was published.
  • 2021-10-06T15:04:27Z - NCEI Accession 0241686 v1.1 was published.
  • 2021-10-09T13:39:17Z - NCEI Accession 0241719 v1.1 was published.
  • 2021-10-11T20:16:20Z - NCEI Accession 0241686 was revised and v2.2 was published.
  • 2021-10-13T20:46:44Z - NCEI Accession 0241719 was revised and v2.2 was published.
  • 2021-10-16T16:14:54Z - NCEI Accession 0242089 v1.1 was published.
  • 2021-10-18T19:32:29Z - NCEI Accession 0241719 was revised and v3.3 was published.
  • 2021-10-23T14:25:13Z - NCEI Accession 0242291 v1.1 was published.
  • 2021-10-25T15:55:42Z - NCEI Accession 0242089 was revised and v2.2 was published.
  • 2021-11-01T01:34:53Z - NCEI Accession 0242291 was revised and v2.2 was published.
  • 2021-11-03T13:57:21Z - NCEI Accession 0242625 v1.1 was published.
  • 2021-11-08T01:32:39Z - NCEI Accession 0242625 was revised and v2.2 was published.
  • 2021-11-10T01:47:22Z - NCEI Accession 0242966 v1.1 was published.
  • 2021-11-13T19:36:32Z - NCEI Accession 0242625 was revised and v3.3 was published.
  • 2021-11-17T15:54:35Z - NCEI Accession 0243349 v1.1 was published.
  • 2021-11-29T13:38:32Z - NCEI Accession 0243349 was revised and v2.2 was published.
  • 2021-12-01T04:36:54Z - NCEI Accession 0242966 was revised and v2.2 was published.
Acquisition Information (collection)
Instrument
  • AVHRR-3
Platform
  • MetOp-A
Last Modified: 2025-04-16T13:24:42Z
For questions about the information on this page, please email: ncei.info@noaa.gov