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:

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) 

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
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.