Abstract
A temporal pattern or characteristic of the ocean surface wave can be learned from bouy observation. In terms of spatial variations, the use of Synthetic Aperture Radar (SAR) image is considered to be the most efficient as SAR is not weather dependent. This paper aimed to study the pattern of ocean waves with study area in Jakarta coast by using SAR image. We focused on spatial variation so that we emphasized in the study of the wave pattern in the area close to the coastline and away from the coast. The low pass filter was applied to reduce the noise and the discontinuity in wave images can be removed as well. The two dimensional Fast Fourier Transform and the dispersion relation were applied to get the wave spectrum and then the amplitude of ocean wave was successfully obtained. By comparing the spectral ocean wave model, the pattern of ocean waves can be understood. The results showed that in the area close to the coastline, the random wave behavior was not dominant, where a single wave pattern as a result of the nonlinear process or the wave-wave interaction appeared. Meanwhile, in the offshore area, the random effect was very dominant.
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