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Acta Oceanologica Sinica

, Volume 36, Issue 7, pp 95–101 | Cite as

Development and validation of an ocean wave retrieval algorithm for VV-polarization Sentinel-1 SAR data

  • Bo Lin
  • Weizeng Shao
  • Xiaofeng Li
  • Huan Li
  • Xiaoqing Du
  • Qiyan Ji
  • Lina Cai
Article

Abstract

The purpose is to study the accuracy of ocean wave parameters retrieved from C-band VV-polarization Sentinel-1 Synthetic Aperture Radar (SAR) images, including both significant wave height (SWH) and mean wave period (MWP), which are both calculated from a SAR-derived wave spectrum. The wind direction from in situ buoys is used and then the wind speed is retrieved by using a new C-band geophysical model function (GMF) model, denoted as C-SARMOD. Continuously, an algorithm parameterized first-guess spectra method (PFSM) is employed to retrieve the SWH and the MWP by using the SAR-derived wind speed. Forty–five VV-polarization Sentinel-1 SAR images are collected, which cover the in situ buoys around US coastal waters. A total of 52 subscenes are selected from those images. The retrieval results are compared with the measurements from in situ buoys. The comparison performs good for a wind retrieval, showing a 1.6 m/s standard deviation (STD) of the wind speed, while a 0.54 m STD of the SWH and a 2.14 s STD of the MWP are exhibited with an acceptable error. Additional 50 images taken in China’s seas were also implemented by using the algorithm PFSM, showing a 0.67 m STD of the SWH and a 2.21 s STD of the MWP compared with European Centre for Medium-range Weather Forecasts (ECMWF) reanalysis grids wave data. The results indicate that the algorithm PFSM works for the wave retrieval from VV-polarization Sentinel-1 SAR image through SAR-derived wind speed by using the new GMF C-SARMOD.

Key words

wind speed significant wave height mean wave period Sentinel-1 synthetic aperture radar 

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Notes

Acknowledgements

The authors appreciate the European Space Agency to provide freely accessible Sentinel-1 SAR images through https://scihub.copernicus.eu. The wind and wave measurements from in situ buoy were collected at http://www.ndbc.noaa.gov/. ECMWF reanalysis wind and wave data were openly accessed from http://www. ecmwf.int. The views, opinions, and findings contained in this paper are those of the authors and should not be construed as an official NOAA or US Government position, policy or decision.

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Copyright information

© The Chinese Society of Oceanography and Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  • Bo Lin
    • 1
  • Weizeng Shao
    • 1
  • Xiaofeng Li
    • 2
  • Huan Li
    • 3
  • Xiaoqing Du
    • 1
  • Qiyan Ji
    • 1
  • Lina Cai
    • 1
  1. 1.Marine Science and Technology CollegeZhejiang Ocean UniversityZhoushanChina
  2. 2.Global Science and TechnologyNational Oceanic and Atmospheric Administration (NOAA)-National Environmental Satellite, Data, and Information Service (NESDIS)College ParkUSA
  3. 3.National Marine Data and Information ServiceState Oceanic AdministrationTianjinChina

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