研究目的
To propose an empirical approach for significant wave height (Hs) retrieval from Gaofen-3 (GF-3) synthetic aperture radar (SAR) wave mode data, as existing methods are not suitable for GF-3 data.
研究成果
The empirical model provides acceptable Hs retrieval accuracy for GF-3 wave mode data with biases and RMSEs ranging from -0.3 m to 0.2 m and 0.34 m to 0.87 m across different wave-codes, except under high sea conditions where errors increase. Future work should focus on improving the model for high sea states and validating with additional data sources.
研究不足
The model shows significant errors when WW3-extracted Hs exceeds 4 m, indicating it is not suitable for high sea conditions. Larger incident angles (e.g., for wave-code 215) degrade performance, and further validation against buoy and altimeter data is needed.
1：Experimental Design and Method Selection:
An empirical model is designed to retrieve Hs using azimuth cut-off wavelength (λc) estimated from the real part of image cross spectra of VV-polarized GF-3 SAR wave mode data. The model is based on fitting coefficients derived from collocated WaveWatch-III (WW3) data.
2：Sample Selection and Data Sources:
2126 GF-3 wave mode images in VV polarization from January to February 2017, mostly located in the northeast Pacific Ocean, are used. 1149 images are for model tuning, and the rest for validation. Data is collocated with WW3 hindcast data at 0.5°×0.5° grid and 3-hour intervals, with time differences within 2 hours.
3：5°×5° grid and 3-hour intervals, with time differences within 2 hours.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Gaofen-3 SAR satellite data, WaveWatch-III model data, computational tools for data processing and analysis.
4：Experimental Procedures and Operational Workflow:
λc is estimated by fitting the image autocorrelation function from the real part of image cross spectra using a Gaussian function. Empirical model coefficients (c0 and c1) are tuned by fitting WW3-derived Hs and GF-3-derived λc/β factor. Validation is performed using separate datasets for each wave-code.
5：Data Analysis Methods:
Statistical analysis including bias and root mean square error (RMSE) calculations to assess retrieval accuracy against WW3 data.
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