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The SSALTO (Segment Sol multi-missions dALTimetrie, d'orbitographie et de localisation précise) multi-mission ground segment encompasses ground support facilities for the control of instruments on DORIS and POSEIDON, processing data from DORIS and the TOPEX/Poseidon, Jason-1 and Envisat-1 Altimeters, and for providing user services and expert Altimetry support.

DUACS (Data unification and Altimeter combination system) is the SSALTO multi-mission Altimeter data processing system. It serves in near-real time the main operational oceanography and climate forecasting centres in Europe and worldwide.

SSALTO/DUACS system processes data from all Altimeter missions (Jason-1, TOPEX/Poseidon, Envisat, GFO, ERS-1 & 2 and even Geosat) to provide a consistent and homogeneous catalogue of products for varied applications, both for near real time applications and offline studies. Ssalto/Duacs Near-Real Time data are used, in particular, by Godae and its French contribution Mercator Océan. In delayed time, hundreds of participating teams retrieve historical DUACS datasets. Wave parameters provided are significant wave height from the Altimeter.