Satellite altimeters have been making precise measurements of sea level since the launch of TOPEX/Poseidon in 1992. A joint mission of NASA and CNES, TOPEX/Poseidon was followed by Jason-1 in 2001 and the Ocean Surface Topography Mission on the Jason-2 satellite in 2008.
satElLitE AlTImetErs hAVE beEN MAkInG pREcise meAsuRemeNtS of sEa leveL Since the launCH Of toPex/POSeiDon in 1992. a joint mIssion Of nasa And cNEs, topEx/Poseidon waS foLLowed by jAson-1 in 2001 and the oceAn surfaCe topoGraPhy mIsSIon on tHe jason-2 satelLitE IN 2008.