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
Use: marine meteorology, ocean-atmosphere gas tranfer studies
Description : Monomission product
Geographic coverage Global
Tools:
- User Guide of SWOT Level-2 Nadir Altimeter products
SALP-ST-M-EA-17043-CN, edition 1.4, Oct 2022 - SARAL/Altika user guide, GDR-F version
SALP-MU-P-OP-17273-CN, edition 1.4, Sept. 2020 - SARAL/AltiKa Products handbook GDR-F version (pdf, 5 MB)
SALP-MU-M-OP-15984-CN, edition 3.1, Jan. 2021 - Jason-3 Product handbook,
SALP-MU-M-OP-16118-CN, edition 2.1, June. 2021 - since January 2020: new GDR-F version Saral user product document and improvements
- OSTM/Jason-2 Products handbook (pdf, 2 MB)
SALP-MU-M-OP-15815-CN, edition 1.11, Jan. 2017 - Jason-1 Products Handbook (pdf, 9 MB)
SMM-MU-M5-OP-13184-CN, edition 5.1, April 2016 - Topex/Poseidon Products Handbook (pdf, 3.6 MB)
SALP-MU-MAO-OP-17607-CN edition 1.0, June 2023
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
| Satellite | Distribution media | Frequency | Delivery delay | Data period | Data used | File weight |
|---|---|---|---|---|---|---|
| Swot Nadir L2_NATL_GDR | Available via your personal space: MY AVISO+, select the product "GDR / IGDR (Geophysical Data Records)" in the page "My products" (dedicated credentials are necessary, please fill the form on the registration form) | every day (CalVal orbit phase) and 21 days (Science orbit phase) | <90 days | 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). | One pass per file | <50 MB per file |
| Jason-3 | The Archive is distributed via the catalogue Aviso+ Cnes Data Center (dedicated credentials are necessary, please register online) | every 10 days | <90 days | Feb.2016-ongoing | 4 MB | |
| Saral | every 35 days | 2 months | Mar 2013-ongoing | 5.5 MB | ||
| Jason-2 | - | 2 months | Jun 2008 - oct 2019 | 5 MB | ||
| Jason-1 | - | - | Jan 2002 - Jun 2013 | 1.3 MB | ||
| T/P | - | - | Oct 1992 - Oct 2005 | 6 MB | ||
| Envisat | please contact EOHelp (ESA) | - | - | Apr 2003 - Oct 2010 | - | - |
IGDR (near-real time): Nadir altimeter Interim Geophysical data record
| Satellite | Distribution media | Frequency | Delivery delay | Data period | Data used | File weight |
|---|---|---|---|---|---|---|
| Swot Nadir L2_NALT_IGDR | Available via your personal space: MY AVISO+, select the product "GDR / IGDR (Geophysical Data Records)" in the page "My products" (dedicated credentials are necessary, please fill the form on the registration form) | every day | 1 to 2 days | 2023/03/29 - ongoing | One pass per file | <50 MB per pass file |
| Saral | The Archive is distributed via the catalogue Aviso+ Cnes Data Center (dedicated credentials are necessary, please register online) and Available via your personal space: MY AVISO+ and select the product "GDR / IGDR (Geophysical Data Records)" in the page "My products" (dedicated credentials are necessary, different from the AVISO+ Cnes data center, please fill the form on the registration form) | every day | 1 to 2 days | last month online | One pass per file | 6 MB per pass file (zipped) |
| Jason-3 | every day | 1 to 2 days | last month online | One pass per file | 3 MB per pass file (zipped) |
See also IGDR products available on the catalogue (through menu DATA)
OGDR (real time): Nadir altimeter Operational Geophysical data record
| Satellite | Distribution media | Frequency | Delivery delay | Data period | Data used | File weight |
|---|---|---|---|---|---|---|
| Swot Nadir L2_NALT_OGDR | Available via your personal space: MY AVISO+, select the product "GDR / IGDR (Geophysical Data Records)" in the page "My products" (dedicated credentials are necessary, please fill the form on the registration form) | several times per day | 3 to 5 hours per day | 2023/06/21 - ongoing | One pass per file | <25 MB per file |
| Saral | several times per day | 3 to 5 hours per day | last month online | One pass per file | 10-11 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
| Satellite | Distribution media | Frequency | Delivery delay | Data period | Data delivery | File weight |
|---|---|---|---|---|---|---|
| Swot Nadir L2_NATL_GDR | Available via your personal space: MY AVISO+, select the product "Waveforms" in the page "My products" (dedicated credentials are necessary, please fill the form on the registration form) | every day (CalVal orbit phase) and 21 days (Science orbit phase) | <90 days | 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). | one pass per file | - |
| Jason-3 | FTP, please refer to your dedicated | 60 days | 60 days | Feb 2016-ongoing | 18 MB | |
| Saral | Mar 2013-ongoing | 19 MB | ||||
| Jason-2 | Jul 2008-ongoing | 15 MB | ||||
| Jason-1 | - | - | Jan 2002-Jun 2013 | 13 MB | ||
| Envisat | Please contact EOHelp (ESA) | - | - | - | - | |
| T/P | on request via catalogue | - | - | Poseidon cycles | - |
See also Sensor Geophysical products available on the catalogue (through menu DATA)
SIGDR (Near-real-time): Nadir altimeter Sensor Interim Geophysical Data Record
| Satellite | Distribution media | Frequency | Delivery delay | Data period | Data delivery | File weight |
|---|---|---|---|---|---|---|
| Swot Nadir L2_NALT_IGDR | Available via your personal space: MY AVISO+, select the product "Waveforms" in the page "My products" (dedicated credentials are necessary, please fill the form on the registration form) | every day | 2 days | 2023/03/29 - ongoing | one pass per file | - |
| Jason-3 | FTP, please refer to your dedicated MY AVISO+ | every day | 2 days | last 3 months online | 18 MB | |
| Saral | 19 MB | |||||
| Jason-2 | 15 MB |
See also Sensor Geophysical products available on the catalogue (through menu DATA)
Products 
