NASA Satellites Measure And Monitor Sea Level

SpaceRef - Your Space Reference: "NASA works with agency partners such as the National Oceanic and Atmospheric Administration and the National Science Foundation to explore and understand sea level change. Critical resources that NASA brings to bear on this issue include such satellites as: -- Topex/Poseidon and Jason, the U.S. portions of which are managed by JPL, which use radar to map the precise features of the oceans' surface, measuring ocean height and monitoring ocean circulation; -- Ice, Cloud and Land Elevation Satellite (IceSat), which studies the mass of polar ice sheets and their contributions to global sea level change; -- Gravity Recovery And Climate Experiment (Grace), also managed by JPL, which maps Earth's gravitational field, allowing us to better understand movement of water throughout the Earth. "