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• W2792696662 abstract "This paper aims to illustrate and test a method, based on the Two-Dimensional Continuous Wavelet Transform (2D-CWT), developed to extract the wind directions from the Synthetic Aperture Radar (SAR) images. The knowledge of the wind direction is essential to retrieve the wind speed by using the radar-backscatter versus wind speed algorithms. The method has been applied to 61 SAR images from different satellites (Envisat, COSMO-SkyMed, Radarsat-2 and Sentinel-1A,B), and the results have been compared with the analysis wind fields from the European Centre for Medium-range Weather Forecasts (ECMWF) model, with in situ reports and with scatterometer data when available. The 2D-CWT method provides satisfactory results, both in areas a few kilometres from the coast and offshore. It is reliable as it produces good direction estimates, no matter what the characteristics of the SAR are. Statistics reports a success in the SAR wind direction estimates in 95% of cases (in 83% of cases the SAR-ECMWF wind direction difference is < ± 20 ∘ , in 92 % < ± 30 ∘ ) with a mean directional bias B θ < 7 ∘ . The SAR derived wind directions cannot be said to be validated, as the data available at present cannot be really representative of the wind field in the coastal area. However, the figures given by SAR winds are highly valuable even not properly validated, providing an independent and unique view of the spatial variability of the wind over the sea, which is possible by using the 2D-CWT method to derive the wind directions." @default.
• W2792696662 created "2018-03-29" @default.
• W2792696662 creator A5066571606 @default.
• W2792696662 date "2018-02-08" @default.
• W2792696662 modified "2023-10-03" @default.
• W2792696662 title "Wind Direction Extraction from SAR in Coastal Areas" @default.
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• W2792696662 doi "https://doi.org/10.3390/rs10020261" @default.
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