Contents: along-track altimetric measurements averaged over 1 second, corrections to apply in delayed time (GDR), near-real time (IGDR) or real-time (OGDR)

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

Use: geophysical studies, operational oceanography (near-real time), climate applications

Description : mono altimeter satellite products available in real-time (OGDR), near-real time (IGDR) and in delayed time (GDR). Each file contains all environmental and geophysical corrections dedicated to Altimetry. It provides data to the operational and research user communities.

Check monomossion processing last updates.

Geographic coverage Global

Copyright :
1992-2005 Cnes and Nasa for T/P (I)GDR data,
2002-2013 Cnes and Nasa for Jason-1,
2002-2012 Esa for Envisat data,
2008-2019 Cnes for Jason-2 data,
2016-ongoing Cnes, Nasa, Eumetsat and Noaa for Jason-3,
2013-ongoing Cnes for IGDR Saral/AltiKa data and Isro/Eumetsat for OGDR Saral/AltiKa data,
2023-ongoing Cnes and Nasa for O/I/GDR Swot

Condition of use: please refer to the Licence Agreement

User manuals:

Technical notes:

• Benefits Of The “Adaptive Retracking Solution” For The Jason-3 Gdr-F Reprocessing Campaign
• Filtering ionospheric correction from altimetry dual-frequencies solution

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

See also Wind / Wave products available on the Catalogue

GDR (Delayed time): Radiometer Geophysical data record

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

See also IGDR products available on the catalogue (through menu DATA)

IGDR (Near real time): Radiometer Interim Geophysical data record

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

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.

OGDR (real time): Radiometer Operational Geophysical data record