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The CTOH computes regional along-track sea level anomaly (SLA) products for the following altimeter missions: Topex/Poseidon, Jason-1, Jason-1 interleaved, Topex/Poseidon interleaved, Jason-2, Geosat Follow on (GFO) and Envisat.  Long time series of SLA combining altimeter data from T/P, Jason-1 and Jason-2 are also available.  Table 1 indicates for each satellite mission and/or regional product the first and last dates available (and the corresponding cycle number). For the moment, only Jason-2 products are distributed.

MissionStartEnd
T/P1993/02/28 (17)2002/08/12 (364)
Jason-12002/01/16 (1)2009/01/27 (259)
Jason-2 GDR2008/07/13 (1)2013/03/30 (174)
T/P+Jason-1+Jason-21993/02/28 (17 of T/P)2013/03/30 (174 of Jason-2)
T/P interleaved2002/09/21(369)2005/10/09(481)
Jason-1 interleaved2009/02/11(262)2012/03/03(274)
Envisat-v2.12002/10/01(10)2010/09/14(92)
GFO2000/01/08(37)2008/09/08(222)
T/P interleaved+Jason-1 interleaved2002/09/21(369 of T/P interleaved)2012/02/02(372 of Jason-1 interleaved)

Table 1: For the moment, on Jason-2 products are distributed.

Using the GDR (Geophysical Data Record) data and additional altimetry corrections available in the CTOH database (see Processing method for details), SLA projected onto reference tracks with a spatial interval of about 6-7 km between points (1 second) are computed using the X-TRACK software (Roblou et al., 2011), developed at LEGOS. The processing is done on a regional basis and for each region, both raw and along-track low-pass filtered (using a 40-km cutoff frequency) SLA are available.

Publications should include the following statement in the Acknowledgments: “Altimetry data used in this study were developed, validated, and distributed by the CTOH/LEGOS, France”.

Product content:

The product available in a number of different regions (see map) consists in 1-Hz alongtrack SLA time series reprocessed on a regional basis with the X-TRACK software. It is provided in NetCDF format and includes: 

  • the SLA data along a nominal ground-track, 
  • an alongtrack MSSH profile which is consistent with the SLA (same period of data), 
  • the geophysical corrections (the X-TRACK tidal and X-TRACK DAC corrections are already applied on SLA but are provided in separate fields for information) and 
  • the distance to nearest coast from Leuliette (see references).

Further information:

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