Abstract:Lodging is a common disaster of wheat. In order to quickly and accurately extract the lodging area of winter wheat, two lodging processes of winter wheat in Dezhou were taken as research cases. The data of GF-6 satellite and Sentinel-1 synthetic aperture radar were used to extract the lodging area of winter wheat accurately according to the different spectral characteristics of lodging wheat and normal wheat..The results showed that spectral analysis of normal wheat and lodging wheat showed that the reflectance of the green light band in the Gaofen-6 image and the backscatter intensity in the VH image were significantly higher in the latter than in the former.The lodging area of winter wheat extracted from these two features was generally larger than the measured area. When lodging was serious, the relative error percentage ranged from 3.1% to 4.6%.Compared with severe lodging, the relative error of extraction is larger in mild lodging, and the extraction result based on Gf-6 was more accurate when lodging and stagnant water are present at the same time. The research results provide reference for further improving the precision of extracting lodging area of winter wheat, and also provide data support for timely prevention and remedy of winter wheat lodging.