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:

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

GDR (delayed time)

Satellite

Distribution media

Frequency

Delivery delay

Data period

Data used

File weight

Saral

FTP

every 35 days

2 months

Mar 2013-ongoing

One pass per file

5.5 MB per pass file (zipped)

Jason-2

GDR DVD Rom (on request)

every 3 months

60 days

Jun 2008 - ongoing

One pass per file

5 MB per pass file
(zipped)

FTP

every 10 days

Jason-1

GDR DVD Rom

every 3 months

40 days

Jan 2002 - ongoing

One pass per file

1.3 MB per pass file

FTP (binary format)
FTP (NetCDF)

every 10 days

Envisat

please contact EOHelp (ESA)

every 35 days

2 months

Apr 2003 - ongoing

One pass per file

1.3 MB per pass file

T/P

CD Rom

every month

40 days

Oct 1992 - Dec 2003

One pass per file

0.7 MB per pass file

DVD Rom GDR

every 2 months

Dec 2003 - Oct 2005

See also GDR products available on the catalogue (through menu DATA SELECTION) and existing CD / DVD Roms list

 

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

Satellite

Distribution media

Frequency

Delivery delay

Data period

Data used

File weight

Saral

ftp

every day

1 to 2 days

last month online

One pass per file

5-6 MB per pass file (zipped)

Jason-2

ftp

every day

1 to 2 days

last month online

One pass per file

2-3 MB per pass file
(zipped)

Jason-1

ftp

every day

2 to 3 days

last month online

One pass per file

1.3 MB per pass file

Envisat

ftp, please contact EOHelp (ESA)

every day

3 to 5 days

last 2 months online

One pass per file

1.3 MB per pass file

See also IGDR products available on the catalogue (through menu DATA SELECTION)

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 SELECTION)
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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