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Remote Sens. 2017, 9(7), 694; https://doi.org/10.3390/rs9070694

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

1
National Ocean Technology Center, State Oceanic Administration, Tianjin 300112, China
2
State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
3
Laboratoire d’Océanographie Physique et Spatiale, Institut Français de Recherche pour l’Exploitation de la Mer, Brest 29280, France
4
Marine Acoustics and Remote Sensing Laboratory, Zhejiang Ocean University, Zhoushan 316000, China
5
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)
View Full-Text   |   Download PDF [4370 KB, uploaded 5 July 2017]   |  

Abstract

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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