即使机载激光雷达经过良好的检校, 激光雷达数据仍可能呈现残余系统误差, 从而导致测区各个航带存在变形。先基于面特征计算安置角, 为消除残余系统误差的航带平差提供初始点云; 再基于迭代最近点法(ICP)的航带平差法, 以连接点三维坐标相等为条件, 对扫描角度误差进行非线性变形改正。结果表明, 该方法能保证高空飞行数据的绝对精度, 点云精度可满足要求。

Even if the airborne lidar is well calibrated, lidar data still may show residual system error, which results in the deformation of strips in each testing zone. We firstly calculates the placement angle based on the surface feature, which provides the initial point cloud for eliminating the residual system error. Then, under the condition of the same three-dimensional coordinate of the connection point, the nonlinear error of the scanning angle error is corrected based on the iterative closest point (ICP) method. Experiments show that the method can guarantee the absolute accuracy of high altitude flight data, and the point cloud accuracy can meet related requirements.