Welcome to the CTOH website, here you will find information about this team, its goals, its products, and the applications we work on.

July 2016: Check the last issue of the AVISO+ newsletter 

April 2016: ERS-2 mission reprocessing at CTOH for continental surfaces news 

March 2016: A new release of X-TRACK products is available; check out the latest improvements in the news 

Continental Surfaces Coastal altimetry - X-TRACK products
Sea Ice
 ERS-2  ice-2 backscatter  altimetry derived tide constituents  sea ice altimetry detection

Alongtrack GDR data (land/ocean) 
 fsle off south of africa
 jason2d ssha cycle 50  

The CTOH is a French Observation Service dedicated to satellite altimetry studies (Centre of Topography of the Oceans and the Hydrosphere) . The CTOH aims to help scientific users develop new altimetric products and applications.

Within this framework, the CTOH maintains homogeneous altimetric data bases for the long-term monitoring of sea level and ocean currents, lake and river levels, the cryosphère, and the planet's climate.

Scientific users can extract :




The CTOH works in close collaboration with scientific research groups at LEGOS to develop new altimetric products, for monitoring lake and river levels (HYDROWEB), and over the cryosphere (OSCAR).


Established in 1989, the CTOH is an INSU Observational Service, supported by the Centre National de la Recherche Scientifique (CNRS), Centre National d'Etudes Spatiales (CNES), Observatoire Midi-Pyrénées (OMP), Pôle Océan-Altimétrie-Climat (CPER).


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