三维激光点云地表形变分析算法研究

常规距离变化分析算法单向判定点云脱离地表TIN表面距离,受点云扫描位置、TIN构造算法、点云密度等影响较大,容易造成误判或失真。该文基于常规点云形变分析方法提出双向距离变异形变分析法,改进单向判定点云脱离地表TIN表面距离容易造成误判或失真的弊端,能够从原始数据和当期数据2方面进行距离变化分析,确保形变计算的准确性。提出的体积形变分析法从原始TIN和当期TIN地表体积变化入手更能够准确、直观反映地表形变,对地表形变细微变化效果尤为明显。

The conventional distance change analysis algorithm determines the distance of the point cloud from the surface TIN surface one-way,which is greatly affected by the point cloud scanning position,TIN construction algorithm,point cloud density and so on,is prone to cause misjudgment or distortion.In this paper,based on the conventional point cloud deformation analysis method,a two-way distance variation deformation analysis method is proposed,which improves the malpractice that one-way determination of the distance between the point cloud from the surface TIN surface is prone to cause misjudgment or distortion.The distance change analysis can be carried out from both the original data and the current data to ensure the accuracy of deformation calculation.The proposed volume deformation analysis method can reflect the surface deformation more accurately and intuitively from the original TIN and the current TIN surface volume changes,especially for the subtle changes of surface deformation.