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Towards a better understanding of ocean from space
Processing ocean swell, ice waves, and coastal waves using SAR images.
Home_image
Sentinel-1 image from the Portuguese coast near Nazaré.
Source: Ocean Virtual Laboratory, ESA, OceanDataLab, Copernicus Sentinel data 2022.
The SARWAVE project is developing a new sea state processor from SAR images to be applied over open ocean, sea ice, and coastal areas, and exploring potential synergy with other microwave and optical EO products.
processor
SAR ocean spectrum for swell monitoring obtained from IW SLC.
Source: LOPS-Ifremer.
New sea state processor
processor
SAR ocean spectrum for swell monitoring obtained from IW SLC.
Source: LOPS-Ifremer.
A new algorithm aims at deriving the directional wave spectrum from Sentinel-1 Interferometric Wide Swath (IWS) TOPS (Terrain Observation with Progressive Scans) to Level-1 SLC products acquired over oceans. In-situ buoys and collocated EO datasets will be used to assess wind and wave inversion quality. Sentinel-1 experimental products are generated through the CREODIAS platform, and datasets are available here.
optical-data
Cyclone Medicane Apollo captured by Sentinel-1B (04:57 H-5) and by Sentinel-2 (9:40 H+0) on 26/10/2021.
Source: Copernicus Sentinel data 2021 and Google Earth.
Synergies with optical data
optical-data
Cyclone Medicane Apollo captured by Sentinel-1B (04:57 H-5) and by Sentinel-2 (9:40 H+0) on 26/10/2021.
Source: Copernicus Sentinel data 2021 and Google Earth.
When colocation is available, SAR IW acquisition is analysed jointly with optical Sentinel-2 measurements. In particular, this study shall provide key insights in cloud free areas. Optical measurement allows for independent estimation of sea state parameters and directional ocean wave spectra, providing opportunities for cross-validation, performance analysis, and possible complementary data.
altimetry
Significant Wave Height (SWH) obtained from Sentinel-6A.
Source: Ocean Virtual Laboratory, ESA, OceanDataLab, Copernicus Sentinel data 2022.
Synergies with altimetry
altimetry
Significant Wave Height (SWH) obtained from Sentinel-6A.
Source: Ocean Virtual Laboratory, ESA, OceanDataLab, Copernicus Sentinel data 2022.
Altimetry data can improve the understanding of ocean parameters when combined with SAR observations. Thus, Sentinel-1 measurements are analysed jointly with altimeter derived integral parameters (Hs, vertical velocity, etc.). Experimental swell estimates are also being developed from radar altimeters based on Fully-Focussed SAR spectra, as well as synergies with S-1 retrieved swell on collocated passes.
other
Sea ice waves in marginal ice zones.
Source: Ocean Virtual Laboratory, ESA, OceanDataLab, Copernicus Sentinel data 2022.
other
Collocation of Sentinel-1, Significant Wave Height (SWH) from Nadir SWIM and Fluctuation Spectrum from LS2 SWIM in CFOSAT.
Source: ESA, OceanDataLab, CNES, IWWOC, CWWIC, Copernicus Sentinel data 2022.
other
Collocation of Sentinel-1 and Wave 1st Spectral Partition model MFWAM.
Source: ESA, OceanDataLab, Méteo-France, CMEMS, Copernicus Sentinel Data 2022.
Other specific investigations
other
Sea ice waves in marginal ice zones.
Source: Ocean Virtual Laboratory, ESA, OceanDataLab, Copernicus Sentinel data 2022.
other
Collocation of Sentinel-1, Significant Wave Height (SWH) from Nadir SWIM and Fluctuation Spectrum from LS2 SWIM in CFOSAT.
Source: ESA, OceanDataLab, CNES, IWWOC, CWWIC, Copernicus Sentinel data 2022.
other
Collocation of Sentinel-1 and Wave 1st Spectral Partition model MFWAM.
Source: ESA, OceanDataLab, Méteo-France, CMEMS, Copernicus Sentinel Data 2022.
The SARWAVE project carries out additional research, examining how Arctic sea waves propagate into sea ice in marginal ice zones. The assimilation of wave information from SAR into coastal wave models is also addressed, as well as multi-sensor studies of Mediterranean cyclones.
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Project funded by the European Space Agency.
Contract No.: 4000137982/22/I-DT
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