摘要
利用CYGNSS(cyclone global navigation satellite system)采集的GNSS卫星反射信号,提出一种基于星载GNSS-R的水体分布探测方法。首先对CYGNSS低轨卫星星座采集的GNSS反射信号进行处理,获取地表反射率数据;再按0.01°×0.01°的空间分辨率将研究区划分为格网,剔除异常值和无效值后,利用区域均值算法重新计算各格网的反射率,并利用格网样本方差和标准差作为衡量指标,采用随机游走图像分割算法进行水体分布探测;最后利用本文提出的方法分析刚果盆地的水体分布情况,并利用MODIS数据对结果进行评估。结果表明,星载GNSS-R具有较强的水体分布探测能力,进一步拓展了GNSS-R的应用场景。
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.
作者
汪俊涛
朱勇超
高飞
李江洋
陶庭叶
WANG Juntao;ZHU Yongchao;GAO Fei;LI Jiangyang;TAO Tingye(College of Civil Engineering,Hefei University of Technology,193 Tunxi Road,Hefei 230009,China;Key Laboratory for Digital Land and Resources of Jiangxi Province,East China University of Technology,418 Guanglan Road,Nanchang 330013,China;Key Laboratory of Geospace Environment and Geodesy,Ministry of Education,Wuhan University,129 Luoyu Road,Wuhan 430079,China;State Key Laboratory of Information Engineering in Surveying,Mapping and Remote Sensing,Wuhan University,129 Luoyu Road,Wuhan 430079,China)
出处
《大地测量与地球动力学》
CSCD
北大核心
2021年第8期777-782,共6页
Journal of Geodesy and Geodynamics
基金
东华理工大学江西省数字国土重点实验室开放基金(DLLJ202001)
武汉大学地球空间环境与大地测量教育部重点实验室开放基金(19-01-03)
武汉大学测绘遥感信息工程国家重点实验室开放基金(20P04)。
