Sea state

Sea state covers ocean wave conditions such as significant wave height, wave spectra, wave period, direction, and forecast or climate sea-state indicators. The observed signals include radar altimeter waveforms, SAR wave-mode spectra, model-assimilated wave fields, and optical wave-pattern proxies, with outputs delivered as along-track, scene-scale, and global gridded products for near-real-time marine operations, delayed-mode processing, and climate records.^[1][2][3][4]

SAR wave-mode retrieval supports ocean swell spectra and integrated wave parameters, with availability tied to acquisition mode and open-ocean wave-mode use cases.^[1][5] Radar altimetry supports significant wave height and along-track wind-speed information, with sparse track sampling and limited directional-spectrum information as caveats.^[2][6] Copernicus Marine wave products cover global wave analysis and forecast fields plus satellite spectral parameters, while ESA Sea State CCI provides climate-record significant wave height products.^[3][7][4] Optical wave-spectra retrieval can estimate wave-pattern properties from visible imagery under clear-sky and suitable illumination conditions, making it a complementary route rather than an all-weather baseline.^[8]