Abstract
Ocean waves have been observed by the satellite remote sensing data operated at the microwaves. In particular, the surface capillary-gravity waves which are sensitive to the surface-wind stress and whose crest perpendicular represented as the wind direction are studied by many oceanographers and scientists. On the other hand, there are few papers of the gravity waves as a swell. But it is important that the motion of gravity waves were observed and studied because it is necessary to plan the disaster privation and make the environmental assessment in the coastal. Therefore, it makes a method of estimating the wave heights from the backscattering coefficients in the SAR images. In this method, the wave heights are estimated by using a composite-scattering model and the image wavenumber spectrum obtainable from SAR. In addition, the wavelength and wave-direction are also estimated by this spectrum. Finally, these values are good agreement with the values of the wave recorder in the coastal.
