Level 2 OCN Ocean Swell Spectra (OSW) Component
The OSW component is a two-dimensional ocean surface swell spectrum and includes an estimate of wind speed and direction per swell spectrum. The OSW component provides continuity measurement of SAR swell spectra at C-band. OSW are estimated from SENTINEL-1 SLC images by inversion of the corresponding image cross-spectra.
The OSW is generated from Stripmap and Wave modes only and is not available from the TOPSAR IW and EW modes. For Stripmap mode, there are multiple spectra derived from the Level-1 SLC image. For Wave mode, there is one spectrum per vignette.
Ocean wave height spectra are provided in units of m4 and given on a polar grid of wavenumber in rad/m and direction in degN.
The OWS product also contains one estimate of the wind speed in m/s and direction in degN per ocean wave spectrum, as well as parameters derived from the ocean wave spectra (integrated wave parameters) and from the imagette (image statistics).
The spatial coverage of the OWS product is equal to the spatial coverage of the corresponding Level-1 WV SLC or Level-1 SM SLC product, limited to ocean areas.