基于不同遥感影像的无控水深反演精度比较

Comparison of the accuracy of water depth retrieval with no ground truth based on different remote sensing images

为检验无控制点的遥感水深反演在不同空间分辨率遥感影像下的适用性和测深精度,介绍并推导了无实测控制点的双波段对数线性分析算法,基于空间分辨率为2 m的WorldView-2影像、10 m的Sentinel-2影像和16 m的GF-1 WFV4影像,以赵述岛和甘泉岛为研究区域,反演水深值,并将反演结果与实测水深进行对比及精度评价分析。结果显示:两个研究区域WorldView-2影像的无实测控制点水深反演模型精度最高,Sentinel-2影像的水深反演精度较好,GF-1 WFV4影像的水深反演精度最低,且遥感影像的空间分辨率、辐射分辨率和无控制点几何定位精度对无实测控制点的双波段对数线性分析模型的水深反演结果存在影响。

To test the applicability and accuracy of remote sensing images with different spatial resolutions in water depth retrieval with no ground truth.In this paper,with the spatial resolution of 2 m WorldView-2 image,10m Sentinel-2 image and 16 m GF-1 WFV4 image,Zhaoshu Island and Ganquan Island as the research area,the dual band log-linear analysis model based on no ground truth was used to invert the water depth value.The results of inversion were compared with the measured water depth and the accuracy was evaluated.The results show that the bathymetric inversion model with no ground truth of WorldView-2 image in the two research areas has the highest accuracy,Sentinel-2 image has the better accuracy,and GF-1 WFV4 image has the lowest accuracy.Moreover,the spatial resolution of remote sensing image,radiation resolution and geometric positioning accuracy of non-controlled points have influence on the bathymetric inversion results of the dual band log-linear analysis model with no ground truth.