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GDR (Geophysical Data Records)

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

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 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:

Disclaimer about the Swot Nadir altimeter sample data:

The Operational and Intermediate Geophysical Data Records products are not yet ready for distribution, however some sample files (3 IGDRs and 2 OGDRs files) have been selected for early dissemination.  

 

Dissemination

 -  The ftp 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. 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.

 -  The dissemination via the AVISO+ Cnes Data Center is also possible. Registration: please register on top/right of AVISO+ Cnes Data Center


GDR (delayed-time): Geophysical Data Record

Satellite Distribution media Frequency Delivery delay Data period Data used File weight
Jason-3

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+, 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 10 days 2 months Feb.2016-ongoing One pass per file (zipped) 4 MB
Saral every 35 days 2 months Mar 2013-ongoing 5.5 MB 
Jason-2 every 10 days 2 months Jun 2008 - oct 2019 5 MB
Jason-1 every 10 days - Jan 2002 - Jun 2013 1.3 MB 
Envisat please contact EOHelp (ESA) - - Apr 2003 - Oct 2010 - -
T/P The Archive is distributed via the catalogue Aviso+ Cnes Data Center (dedicated credentials are necessary, please register online) - - Oct 1992 - Oct 2005 One pass per file 0.7 MB 

See also Wind / Wave products available on the Catalogue

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

Satellite Distribution media Frequency Delivery delay Data period Data used File weight
Swot Nadir (test samples) Available via your personal space: MY AVISO+, 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)
- - - One pass per file

<350 KB per file for reduced dataset
<7 MB per file for standard dataset
<46 MB per file for expertise dataset

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) : Operational Geophysical data record

Satellite Distribution media Frequency Delivery delay Data period Data used File weight
Swot Nadir (test samples) Available via your personal space: MY AVISO+, 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)
 - - - One pass per file <800 KB per file for reduced dataset
<22 MB per file for standard dataset
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.

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