Next Article in Journal / Special Issue
Unambiguous Imaging of Static Scenes and Moving Targets with the First Chinese Dual-Channel Spaceborne SAR Sensor
Previous Article in Journal
A Brief Review of OPT101 Sensor Application in Near-Infrared Spectroscopy Instrumentation for Intensive Care Unit Clinics
Previous Article in Special Issue
Fast Vessel Detection in Gaofen-3 SAR Images with Ultrafine Strip-Map Mode
 
 
Article

Preliminary Assessment of Wind and Wave Retrieval from Chinese Gaofen-3 SAR Imagery

by 1,2, 1 and 3,*
1
Marine Science and Technology College, Zhejiang Ocean University, Zhoushan 316000, China
2
Key Laboratory for Earth Observation of Hainan Province, Hainan 572029, China
3
Physical Oceanography Laboratory/CIMST, Ocean University of China and Qingdao National Laboratory for Marine Science and Technology, Qingdao 266100, China
*
Author to whom correspondence should be addressed.
Sensors 2017, 17(8), 1705; https://doi.org/10.3390/s17081705
Received: 30 May 2017 / Revised: 13 July 2017 / Accepted: 18 July 2017 / Published: 25 July 2017
(This article belongs to the Special Issue First Experiences with Chinese Gaofen-3 SAR Sensor)
The Chinese Gaofen-3 (GF-3) synthetic aperture radar (SAR) launched by the China Academy of Space Technology (CAST) has operated at C-band since September 2016. To date, we have collected 16/42 images in vertical-vertical (VV)/horizontal-horizontal (HH) polarization, covering the National Data Buoy Center (NDBC) buoy measurements of the National Oceanic and Atmospheric Administration (NOAA) around U.S. western coastal waters. Wind speeds from NDBC in situ buoys are up to 15 m/s and buoy-measured significant wave height (SWH) has ranged from 0.5 m to 3 m. In this study, winds were retrieved using the geophysical model function (GMF) together with the polarization ratio (PR) model and waves were retrieved using a new empirical algorithm based on SAR cutoff wavelength in satellite flight direction, herein called CSAR_WAVE. Validation against buoy measurements shows a 1.4/1.9 m/s root mean square error (RMSE) of wind speed and a 24/23% scatter index (SI) of SWH for VV/HH polarization. In addition, wind and wave retrieval results from 166 GF-3 images were compared with the European Centre for Medium-Range Weather Forecasts (ECMWF) re-analysis winds, as well as the SWH from the WaveWatch-III model, respectively. Comparisons show a 2.0 m/s RMSE for wind speed with a 36% SI of SWH for VV-polarization and a 2.2 m/s RMSE for wind speed with a 37% SI of SWH for HH-polarization. Our work gives a preliminary assessment of the wind and wave retrieval results from GF-3 SAR images for the first time and will provide guidance for marine applications of GF-3 SAR. View Full-Text
Keywords: Gaofen-3; synthetic aperture radar; wind; wave Gaofen-3; synthetic aperture radar; wind; wave
Show Figures

Figure 1

MDPI and ACS Style

Shao, W.; Sheng, Y.; Sun, J. Preliminary Assessment of Wind and Wave Retrieval from Chinese Gaofen-3 SAR Imagery. Sensors 2017, 17, 1705. https://doi.org/10.3390/s17081705

AMA Style

Shao W, Sheng Y, Sun J. Preliminary Assessment of Wind and Wave Retrieval from Chinese Gaofen-3 SAR Imagery. Sensors. 2017; 17(8):1705. https://doi.org/10.3390/s17081705

Chicago/Turabian Style

Shao, Weizeng, Yexin Sheng, and Jian Sun. 2017. "Preliminary Assessment of Wind and Wave Retrieval from Chinese Gaofen-3 SAR Imagery" Sensors 17, no. 8: 1705. https://doi.org/10.3390/s17081705

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop