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)
Description : for Topex/Poseidon (M-GDR), data are homogeneous between Topex and Poseidon-1 altimeters
Check monomossion processing last updates.
Geographic coverage Global
Copyright : 1992-2005 Cnes and Nasa for T/P (I)GDR data, 2002-ongoing Cnes and Nasa for Jason-1, 2002-2012 Esa for Envisat data, 2008-ongoing Cnes for Jason-2 data, 2013-ongoing Cnes for IGDR Saral/AltiKa data and Isro/Eumetsat for OGDR Saral/AltiKa data
Condition of use: please refer to the Licence Agreement
User manuals:
- 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 - Aviso User Handbook: Merged Topex/Poseidon Products (pdf, 900 KB)
AVI-NT-02-101-CN, edition 3.0, July 1996 - Aviso CD ROM UserManual: Merged Topex/Poseidon Products
AVI-NT-02-100-CN, edition 3.0, July 1995. Note that this manual is no longer distributed, due to lack of use (it was mainly intended to explain how to use a CD Rom drive from a Unix station). All the information needed to use GDR-M T/P data is in the above manual (AVI-NT-02-101-CN).
Technical notes:
- Benefits Of The “Adaptive Retracking Solution” For The Jason-3 Gdr-F Reprocessing Campaign
- Filtering ionospheric correction from altimetry dual-frequencies solution
Dissemination:
We inform all the users that the ftp dissemination of the Geophysical Data Records (S/I/GDRs for Jason-1, Jason-2, Jason-3, Saral and OGDRs for Saral) products has been transferred to the authenticated AVISO+ ftp portal (ftp://ftp-access.aviso.altimetry.fr/) where the whole historical data has been moved too.
Note that
-the deliveries on the AVISO+ Cnes Data Center remain unchanged.
-the Online Data Extraction Service (ODES) is not available any more
AVISO+ registration:
For the FTP service:
-If you are not registered, we invite you to fill the form on the AVISO+ web portal to get your credentials as soon as possible. You can consult our FAQ for any information about the registration.
-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.
For the AVISO+ Cnes Data Center
-Please register on top/right of AVISO+ Cnes Data Center
GDR (delayed-time): Geophysical Data Record
Copyright : 2013-ongoing Cnes for IGDR Saral/AltiKa data , 2008-ongoing Cnes for Jason-2 data, 2002-ongoing Cnes and Nasa for Jason-1, 2002-2012 Esa for Envisat data, 1992-2005 Cnes and Nasa for T/P GDR data, 2016-ongoing CNES for Jason-3
| Satellite | Distribution media | Frequency | Delivery delay | Data period | Data used | File weight |
|---|---|---|---|---|---|---|
| Jason-3 | FTP, please refer to your dedicated MY AVISO+
| 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 - ongoing | 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 | request via Catalogue | - | - | Oct 1992 - Oct 2005 | One pass per file | 0.7 MB |
See also GDR products available on the catalogue (through menu DATA)
IGDR (near-real time) : Interim Geophysical data record
| Satellite | Distribution media | Frequency | Delivery delay | Data period | Data used | File weight |
|---|---|---|---|---|---|---|
| Jason-3 | FTP, please refer to your dedicated MY AVISO+ | every day | 1 to 2 days | last month online | One pass per file | 4 MB per pass file (zipped) |
| Saral | 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 |
|---|---|---|---|---|---|---|
| Saral | FTP, please refer to your dedicated MY AVISO+ | several times per day | 3 to 5 hours per day | last month online | One pass per file | 10-11 MB per file (zipped) |
See also OGDR products available on the catalogue (through menu DATA)
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.
Products 
