北京测绘2023，Vol.37Issue(9)：1218-1222,5.DOI:10.19580/j.cnki.1007-3000.2023.09.003
基于梯度算子的高分三号SAR风场反演方法
Wind retrieval method from Gaofen-3 SAR image based on a gradient operator
摘要
Abstract
Given the fact that Gaofeng-3(GF-3)synthetic aperture radar(SAR)can capture the wind streak whose gray values are changing in black and white on image,a wind retrieval method based on Sobel gradient operator is proposed to retrieve wind field from GF-3 SAR images.After resampling the SAR image,the Sobel gradient operator was applied to calculate the wind direction over the sea surface,and then an extended CMOD5 scattering model was explored to calculate the wind speed.To test this method,an experiment was done to process the GF-3 SAR image,whose retrieved wind field is then evaluated using the European Centre for Medium-Range Weather Forecasts(ECMWF)reanalysis wind field data and National Data Buoy Center(NDBC)buoy wind vector.The experiment showed that compared with the ECMWF reanalysis wind field,the root mean square error of the retrieved SAR wind speed and direction was 1.79 m/s and 11.95°,respectively,while compared to NDBC buoy data,the absolute deviation of wind speed and direction was 0.24 m/s and 9.03°,respectively.Therefore,the proposed method acted well to retrieved wind filed with higher precision from GF-3 SAR images.The research results could provide a reference for the wind field retrieval technology of GF-3 SAR.关键词
合成孔径雷达/风条纹/风场反演/梯度算子Key words
synthetic aperture radar/wind streak/wind retrieval/gradient operator分类
天文与地球科学引用本文复制引用
陈克海,张金兰,解学通,邓丹..基于梯度算子的高分三号SAR风场反演方法[J].北京测绘,2023,37(9):1218-1222,5.基金项目
国家自然科学基金(41876204) （41876204）
广东工贸职业技术学院科技项目(2023-ZKT-03) （2023-ZKT-03）
