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Abstract
In this paper we review the physical understanding and the algorithms necessary to extract wave information from the radar altimeter return from the sea surface. This allows us to assess the progress made since the launch of Seasat, to identify areas where further work is necessary in order to develop our understanding of the basic mechanisms of radar interaction with the sea surface, and to suggest how new wave parameters might be obtained from the radar return. Following on from this were view the wave studies that have been carried out using Seasat and Geosat altimeter data and present some new results, on the joint probability distribution of significant waveheight and wind speed, which we have obtained recently from Seasat data.