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Sensor Geophysical products

Contents : 20 Hz (40 Hz for Saral) along-track waveform information, corrections to apply.

Use: expert use; coastal, ice studies or anything requesting a different retracking function than the one used for ocean

Description : Mono altimeter product

Geographic coverage Global

Copyright : 2002-ongoing Cnes and Nasa for OSDR data, 2002-ongoing Esa for Envisat data, 2013-ongoing Cnes for SIGDR Saral data, 2023-ongoing Cnes and Nasa for O/I/GDR Swot

Documentation : 

 

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.

 

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
MY AVISO+

 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)

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