机载LiDAR航带间高程漂移检查方法研究

Height Relative Offset Automatic Detection Algorithm of Airborne LiDAR

机载LiDAR作业时,误差将导致相邻航带的同名特征间存在高程漂移,若偏移量超过一定的阈值,则可能造成后续激光点云数据的分类错误,进而使得用其生成的数字产品无法正确反映真实地形。鉴于此,提出了一种机载LiDAR航带重叠区高程漂移自动化检查算法。由于LiDAR数据本身具有特殊性,相邻航带间不存在真正意义上的同名点,采用提取航带同名面的方式对航带间相对高程进行检查。通过编程计算对实验区数据进行检查分析,并通过人工核查的方式验证了该方法的可靠性。

In airborne LiDAR operation, the error will lead to height relative offsets between the adjacent features of aerial belts. If the offset exceeds a certain threshold, it may cause the classi cation error of the subsequent laser point cloud data. As a result, the digital products such as DEM will not reffect the real terrain correctly. On the basis of this, we proposed an automatic detection method of height relative offset in airborne LiDAR overlap zone. As the speci city of LiDAR data, there is no true sense of homonymous point between adjacent zones. So in this paper, we examined the height relative offsets between the aerial belts by extracting homonymous surface. Then, the experimentation area data were checked and analyzed by programming, and the reliability of the method was confirmed by manual veri cation.