Abstract
Radar altimeter measurements of the marine geoid collected during the Seasat altimeter mission gave geophysicists hope of uncovering the gravity field over all the ocean basins. However, because of insufficient track density, it has taken 16 years for the full potential of the satellite altimeter to be realized. The high‐density coverage obtained by ERS-1 during its geodetic mapping phase (April 1994–March 1995) prompted the U.S. Navy to declassify all of the Geosat altimeter data in June 1995. The combination of these two high‐density data sets provided the first global view of all the ocean basins at a wavelength resolution of 20–30 km.
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