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GDR (Geophysical Data Records)

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

GDR (delayed time)

Satellite

Distribution media

Frequency

Delivery delay

Data period

Data used

File weight

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

Jason-2

ftp

every day

2 to 3 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)