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Remote Sens. 2017, 9(7), 694;

GF-3 SAR Ocean Wind Retrieval: The First View and Preliminary Assessment

National Ocean Technology Center, State Oceanic Administration, Tianjin 300112, China
State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
Laboratoire d’Océanographie Physique et Spatiale, Institut Français de Recherche pour l’Exploitation de la Mer, Brest 29280, France
Marine Acoustics and Remote Sensing Laboratory, Zhejiang Ocean University, Zhoushan 316000, China
National Satellite Ocean Application Service, State Oceanic Administration, Beijing 100081, China
Author to whom correspondence should be addressed.
Academic Editors: Xiaofeng Yang, Xiaofeng Li and Ferdinando Nunziata
Received: 4 June 2017 / Revised: 22 June 2017 / Accepted: 4 July 2017 / Published: 5 July 2017
(This article belongs to the Special Issue Ocean Remote Sensing with Synthetic Aperture Radar)
Full-Text   |   PDF [4370 KB, uploaded 5 July 2017]   |  


Gaofen-3 (GF-3) is the first Chinese civil C-band synthetic aperture radar (SAR) launched on 10 August 2016 by the China Academy of Space Technology (CAST), which operates in 12 imaging modes with a fine spatial resolution up to 1 m. As one of the primary users, the State Oceanic Administration (SOA) operationally processes GF-3 SAR Level-1 products into ocean surface wind vector and plans to officially release the near real-time SAR wind products in the near future. In this paper, the methodology of wind retrieval at C-band SAR is introduced and the first results of GF-3 SAR-derived winds are presented. In particular, the case of the coastal katabatic wind off the west coast of the U.S. captured by GF-3 is discussed. The preliminary accuracy assessment of wind speed and direction retrievals from GF-3 SAR is carried out against in situ measurements from National Data Buoy Center (NDBC) buoy measurements of National Oceanic and Atmospheric Administration (NOAA). Only the buoys located inside the GF-3 SAR wind cell (1 km) were considered as co-located in space, while the time interval between observations of SAR and buoy was limited to less the 30 min. These criteria yielded 56 co-locations during the period from January to April 2017, showing the Root Mean Square Error (RMSE) of 2.46 m/s and 22.22° for wind speed and direction, respectively. Different performances due to geophysical model function (GMF) and Polarization Ratio (PR) are discussed. The preliminary results indicate that GF-3 wind retrievals are encouraging for operational implementation. View Full-Text
Keywords: GF-3; synthetic aperture radar (SAR); ocean surface wind; validation GF-3; synthetic aperture radar (SAR); ocean surface wind; validation

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Wang, H.; Yang, J.; Mouche, A.; Shao, W.; Zhu, J.; Ren, L.; Xie, C. GF-3 SAR Ocean Wind Retrieval: The First View and Preliminary Assessment. Remote Sens. 2017, 9, 694.

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