Recent progress on high wind-speed retrieval from multi-polarization SAR imagery: a review |
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Authors: | Biao Zhang William Perrie |
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Affiliation: | 1. School of Marine Sciences, Nanjing University of Information Science &2. Technology, Nanjing, Chinazhangbiao@nuist.edu.cn;4. Fisheries and Oceans Canada, Bedford Institute of Oceanography, Dartmouth, Nova Scotia, Canada |
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Abstract: | Synthetic aperture radar (SAR) is a useful instrument for monitoring typhoons, hurricanes, and tropical cyclones from space. In this article, we summarize high wind-speed retrieval and validation methods for multi-polarization SAR. Compared to co-polarized geophysical model functions, we show that a cross-polarized wind-speed retrieval model is potentially able to estimate wind speed under extreme weather conditions. The resulting wind speeds are validated using in situ buoy observations, and airborne Stepped-Frequency Microwave Radiometer (SFMR) and spaceborne scatterometer measurements, as well as the National Oceanic and Atmospheric Administration (NOAA) Hurricane Research Division’s Hurricane Wind Analysis System (H*Wind) data. We also analyse the effect of intense rainfall on SAR-derived winds. The wind-speed retrieval accuracy can be improved in cases where the normalized radar cross sections (NRCSs) are suitably modified in rainfall areas. |
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