SLA High-Frequency Products
Alongtrack Sea Level Anomalies - Regional Products
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.
For the SLA High-Frequency product, the X-TRACK processor uses the 10 Hz (T/P) and 20 Hz (Jason-1 & Jason-2) measurements provided in standard GDR (Geophysical Data Records) and the 1Hz geophysical corrections are interpolating at 10 Hz/20Hz times.
Note: the SLA High-frequency is an experimental product available for the moment for the three coastal zones shown on the map below and only for the T/P, Jason-1 and Jason-2 missions. (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".