Launched on August 10, 1992, TOPEX/Poseidon was a joint satellite mission between NASA, the U.S. space agency, and CNES, the French space agency, to map ocean surface topography. The first major oceanographic research vessel to sail into space, TOPEX/Poseidon helped revolutionize oceanography by proving the value of satellite ocean observations.
The satellite operations ended on January 2006.
Jason-1 was launched in 2001 to continue the on-going measurements of sea surface topography.