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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)
Description : for Topex/Poseidon (M-GDR), data are homogeneous between Topex and Poseidon-1 altimeters
Check monomossion processing last updates.
Geographic coverage Global
Tools:

Jason-3 Product handbook, SALP-MU-M-OP-16118-CN, edition 1.4, Jan. 2017
SARAL/AltiKa Products handbook, SALP-MU-M-OP-15984-CN, edition 2.5, July 2016
OSTM/Jason-2 Products handbook, SALP-MU-M-OP-15815-CN, edition 1.11, Jan.2017
Jason-1 Products Handbook, SMM-MU-M5-OP-13184-CN, Edition 5.1, April 2016 (pdf, 9Mo)
Aviso User Handbook: Merged Topex/Poséidon Products, AVI-NT-02-101-CN, Edition 3.0, July 1996 (pdf, 900 KB)

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

to get access Aviso products

GDR (delayed time)

Satellite	Distribution media	Frequency	Delivery delay	Data period	Data used	File weight
Jason-3	FTP	every 10 days	2 months	Feb. 2016 - ongoing	One pass per file	4 MB per file (zipped)
Saral	FTP ODES	every 35 days	2 months	Mar 2013-ongoing	One pass per file	5.5 MB per pass file (zipped)
Jason-2	FTP ODES	every 10 days	3 months	Jun 2008 - ongoing	One pass per file	5 MB per pass file (zipped)
Jason-1	FTP ODES	every 10 days	-	Jan 2002 - Jun 2013	One pass per file	1.3 MB per pass file
Envisat	please contact EOHelp (ESA)	every 35 days	-	Apr 2003 - Oct 2010	One pass per file	1.3 MB per pass file
T/P	CD Rom	-	-	Oct 1992 - Dec 2003	One pass per file	0.7 MB per pass file
T/P	DVD Rom GDR	-	-	Dec 2003 - Oct 2005	One pass per file	0.7 MB per pass file

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 ODES	every day	1 to 2 days	last month online	One pass per file	4 MB per pass file (zipped)
Saral	FTP ODES	every day	1 to 2 days	last month online	One pass per file	5-6 MB per pass file (zipped)
Jason-2	FTP ODES	every day	1 to 2 days	last month online	One pass per file	2-3 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	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.

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