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Geophysical data: GDR, IGDR, OGDR

Contents: along-track altimetric measurements over 1 seconde (+ 20 Hz sampling data only for the OSTM / Jason-2 misison), including significant wave height and wind speed modulus in delayed time or real time (OGDR, OSDR)

DOI: 
- Swot NATL GDR:   10.24400/527896/a01-2023.009, more metadata
- Swot NATL IGDR:   10.24400/527896/a01-2023.005, more metadata
- Swot NATL OGDR: 10.24400/527896/a01-2023.006, more metadata
- Swot RAD GDR:    10.24400/527896/a01-2023.010, more metadata
- Swot RAD IGDR:    10.24400/527896/a01-2023.007, more metadata
- Swot RAD OGDR:  10.24400/527896/a01-2023.008, more metadata
- Jason-2 GDR-F Nadir Altimeter Geophysical Data Record:    10.24400/527896/a01-2025.005, more metadata

Use: marine meteorology, ocean-atmosphere gas tranfer studies

Description : Monomission product

Geographic coverage Global

Tools:

Wind / Wave (delayed time)

 

Disclaimer about SWOT Geophysical Data Record products:

February 2024:
Production and distribution of the SWOT NALT and RAD GDR products:
- Datasets are from Cycles 400 to 578 (January 15 – July 10, 2023) during the SWOT commissioning and calibration phases (1-day repeat orbit), and Cycles 1-6 (July 21 – November 23, 2023) during the science phase (21-day repeat orbit).
- Please note that some passes are not available in the later portion of cycle 578, and very early portions of Cycles 402 and 1 during orbit transitions as well as instrument turn on.

October 2023:
- Release of the reprocessed SWOT 1-day orbit IGDR nadir altimeter products for the period from March 29 to July 10, 2023.
- Please note that some gaps remain in the reprocessed IGDR time series because either the raw IGDRs were not available or the available IGDRs could not be processed with the current version of the processing software.

September 2023:
Production and release of O/I(GDR) products have resumed in nominal conditions.
- Distribution of the OGDR science data products resumes from September 7, 2023 and onwards.
- Distribution of the IGDR science data products starts from July 21, 2023 and onwards.

July 2023: 
- (O/I)GDR production and distribution are temporarily interrupted from July 11, 2023 for the platform transfer to the Science orbit. Users will be notified when the service will resume.
- On-ground instrumental corrections will be updated upon production restart after the orbit change (MLE3 and MLE4 retrackers).
- Improved orbit state flag will be implemented upon production restart after the orbit change.

June 2023:
The SWOT project is pleased to announce the public release of Level 2 data products from the onboard nadir altimeter (NALT) and advanced microwave radiometer (RAD).
- The datasets are from Cycle 559, pass 1 (on June 21, 2023) onward.
- They have been generated with post-launch calibrations for both the NALT and RAD.
- Data from earlier will be provided when the Geophysical Data Record (GDR) will be released by the end of 2023.

 

Dissemination

 -  The ftp/sftp dissemination of all the Geophysical Data Records products is made on the authenticated AVISO+ ftp portal  (ftp://ftp-access.aviso.altimetry.fr/) where the whole historical data are available. The Thredds Data Server dissemination is made on the TDS portal (https://tds.aviso.altimetry.fr/thredds/catalog.html). Registration: we invite you to fill the form on the AVISO+ web portal to get your credentials as soon as possible, if you are already registered but you haven't these products in your list, we invite you to ask for a new product. You can consult our FAQ for any information.


GDR (delayed-time): Nadir altimeter Geophysical Data Record

SatelliteDistribution mediaFrequencyDelivery delayData periodData usedFile weight
Swot Nadir
L2_NATL_GDR

CNES AVISO FTP/SFTP access (with AVISO+ credentials):
ftp://ftp-access.aviso.altimetry.fr:21
sftp://ftp-access.aviso.altimetry.fr:2221
/geophysical-data-record

CNES AVISO THREDDS Data Server access (with AVISO+ credentials):
https://tds-odatis.aviso.altimetry.fr/thredds/catalog/L2/L2.html 

CNES AVISO Data Archiving Center (with AVISO+ credentials):
The Archive is distributed via the catalogue Aviso+ Cnes Data Center

every day (CalVal orbit phase) and 21 days (Science orbit phase)<90 daysfrom Cycles 400 to 578 (January 15 – July 10, 2023) during the SWOT commissioning and calibration phases (1-day repeat orbit), and Cycles 1-6 (July 21 – November 23, 2023) during the science phase (21-day repeat orbit).One pass per file<50 MB per file
Jason-3every 10 days<90 daysFeb.2016-ongoing4 MB
Saralevery 35 days2 monthsMar 2013-ongoing5.5 MB 
Jason-2--Jun 2008 - oct 20195 MB
Jason-1--Jan 2002 - Jun 20131.3 MB 
T/P--Oct 1992 - Oct 20056 MB

IGDR (near-real time): Nadir altimeter Interim Geophysical data record

SatelliteDistribution mediaFrequencyDelivery delayData periodData usedFile weight 
Swot Nadir
L2_NALT_IGDR		CNES AVISO FTP/SFTP access (with AVISO+ credentials):
ftp://ftp-access.aviso.altimetry.fr:21
sftp://ftp-access.aviso.altimetry.fr:2221
/geophysical-data-record

CNES AVISO THREDDS Data Server access (with AVISO+ credentials):
https://tds-odatis.aviso.altimetry.fr/thredds/catalog/L2/L2.html 		every day1 to 2 days2023/03/29 - ongoingOne pass per file<50 MB per pass file
Saralevery day1 to 2 dayslast month onlineOne pass per file6 MB per pass file (zipped)
Jason-3every day1 to 2 dayslast month onlineOne pass per file3 MB per pass file
(zipped)

OGDR (real time): Nadir altimeter Operational Geophysical data record

SatelliteDistribution mediaFrequencyDelivery delayData periodData usedFile weight
Swot Nadir
L2_NALT_OGDR		CNES AVISO FTP/SFTP access (with AVISO+ credentials):
ftp://ftp-access.aviso.altimetry.fr:21
sftp://ftp-access.aviso.altimetry.fr:2221
/geophysical-data-record

CNES AVISO THREDDS Data Server access (with AVISO+ credentials):
https://tds-odatis.aviso.altimetry.fr/thredds/catalog/L2/L2.html 		 several times per day3 to 5 hours per day2023/06/21 - ongoingOne pass per file<25 MB per file
Saralseveral times per day3 to 5 hours per daylast month onlineOne pass per file10-11 MB per file (zipped)

Note: the official dissemination of SARAL OGDR products is under the responsibilty of EUMETSAT and ISRO. CNES declines any responsability in case of products latency or gaps happening on the ftp server.

SGDR (Delayed Time): Nadir altimeter Sensor Geophysical Data Record

SatelliteDistribution mediaFrequencyDelivery delayData periodData deliveryFile weight
Swot Nadir
L2_NATL_GDR		CNES AVISO FTP/SFTP access (with AVISO+ credentials):
ftp://ftp-access.aviso.altimetry.fr:21
sftp://ftp-access.aviso.altimetry.fr:2221
/geophysical-data-record

CNES AVISO THREDDS Data Server access (with AVISO+ credentials):
https://tds-odatis.aviso.altimetry.fr/thredds/catalog/L2/L2.html 		every day (CalVal orbit phase) and 21 days (Science orbit phase)<90 daysfrom Cycles 400 to 578 (January 15 – July 10, 2023) during the SWOT commissioning and calibration phases (1-day repeat orbit), and Cycles 1-6 (July 21 – November 23, 2023) during the science phase (21-day repeat orbit).one pass per file-
Jason-360 days60 daysFeb 2016-ongoing18 MB
SaralMar 2013-ongoing19 MB
Jason-2Archive on CNES AVISO Data Archiving Center Jul 2008-Oct 201915 MB
Jason-1--Jan 2002-Jun 201313 MB
T/P--Poseidon cycles-

SIGDR (Near-real-time): Nadir altimeter Sensor Interim Geophysical Data Record

SatelliteDistribution mediaFrequencyDelivery delayData periodData deliveryFile weight 
Swot Nadir
L2_NALT_IGDR

CNES AVISO FTP/SFTP access (with AVISO+ credentials):
ftp://ftp-access.aviso.altimetry.fr:21
sftp://ftp-access.aviso.altimetry.fr:2221
/geophysical-data-record

CNES AVISO THREDDS Data Server access (with AVISO+ credentials):
https://tds-odatis.aviso.altimetry.fr/thredds/catalog/L2/L2.html 

Archive on CNES AVISO Data Archiving Center

every day2 days2023/03/29 - ongoingone pass per file-
Jason-3every day2 dayslast 3 months online18 MB
Saral19 MB
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