Abstract:We propose a new water distribution detection method based on spaceborne GNSS-R using reflected GNSS signals collected by CYGNSS (cyclone global navigation satellite system). First, we process the reflected GNSS signals collected by CYGNSS constellation to obtain the surface reflectance data. Then, the study area is divided into grids according to the spatial resolution of 0.01°×0.01°. After eliminating outliers and invalid values, the reflectivity of each grid is recalculated using the region average algorithm. We use the grid sample variance and standard deviation as measurement indexes. The random walker segmentation algorithm is used to detect water distribution. Finally, the distribution of water in Congo basin is analyzed using the proposed method, and the results of this paper are evaluated with MODIS data. The results show the great potential of spaceborne GNSS-R for detecting water distribution, further expanding the applications of GNSS-R.
WANG Juntao,ZHU Yongchao,GAO Fei et al. Research on Detection Method of Water Distribution of Spaceborne GNSS-R Based on CYGNSS Data[J]. jgg, 2021, 41(8): 777-782.