SLA 1Hz Products

Alongtrack Sea Level Anomalies - Regional Products


03/2016: A new release of X-TRACK 1hz SLA is available. Be sure to check out the corresponding news

The CTOH computes and distributes specific, coastal along-track sea level anomalies (SLA) using its X-TRACK processor for all precise altimeter missions : Topex/Poseidon (TP), Jason-1 (J1) , Jason-1 interleaved (J1N), Topex/Poseidon interleaved (TPN), Jason-2, Geosat Follow on (GFO) and Envisat (click here to view available missions and the temporal coverage of each one).


Using the latest corrections available in the CTOH database, CTOH computes a coastally-adapted Sea Surface Height (SSH) along the satellites ground-track for each cycle. Additionnal geophysical corrections are applied accounting for the aliasing of tides and short-term atmopheric effects in the SSH measurements. Details on selected corrections are given here. The Mean Sea Surface (MSSH) is computed at each point, based on the mission period currently available, and subtracted from the corrected SSH in order to form the SLA. The SLA are finally projected onto a reference track with a spatial interval of about 7 km between points (1 second).

For every region highlighted on the map below, the CTOH distributes both the raw SLA and a 40-km along-track filtered SLA product (click on the map to view regional details).



Please do not forget to mention the following sentence in all publications or communications referring to a work based on the CTOH/LEGOS altimetry dataset:

"Altimetry data used in this study were developed, validated, and distributed by the CTOH/LEGOS, France".



Data use conditions

Data release:
 Click on the zone you want to view details and informations in this region.


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