关键词: 水域点云; 陆域点云; 罗德里格矩阵; 间接平差; 三维仿真; 长江南京河段;

Abstract: The joint simulation of land and water integration plays an increasingly important role in surveying and mapping, water conservancy and land resources supervision. Guided by the theory of 3 D coordinate transformation, this paper discusses the application of Rodrigue Matrix and indirect adjustment model in the iterative calculation of point cloud registration parameters. In this method, anti-symmetric matrix elements are utilized to form the rotation matrix. Based on multiple tie-points, the initial parameter values of the scale factor, rotation matrix and translation are determined by using the characteristic of Rodrigo's matrix and indirect adjustment model. By means of the obtained initial value of the parameters and the linearized observation equation, the error equations of the tie-points are constructed, and the least square is used to solve the optimal conversion parameter. Taking left bank of Meizizhou sandbar in Nanjing section of the Yangtze River as an example, the proposed method is verified. Experimental results show that this method avoids the complex trigonometric function operation of traditional methods, and improves the efficiency of calculation while ensuring the accuracy, and can easily calculate the initial value of parameters.

Key words: water area point cloud; land area point cloud; Rodrigue Matrix; indirect adjustment; 3D simulation; Nanjing reach of the Yangtze River;