机载激光雷达航带平差实验研究——基于参数模型和地面控制点数据

Airborne LiDAR Strip Adjustment Research:Based on Model Parameters and Ground Control Points Data

机载激光雷达测量获取的地表点云数据在经过预处理解算后仍会残余部分航带性系统误差,因此,在利用点云数据生成DEM等相关数字产品之前,必须检查并改正这部分航带性系统误差。以此为主要目标,选择"十二参数模型"进行航带平差,总结航带平差的一般技术流程,并对航带平差过程中是否引入地面控制点的结果进行对比分析。结果表明,引入地面控制点进行航带平差,数据的内外部精度均得到有效改善。

Although preprocessing surface point cloud data obtained by airborne LiDAR measurement technique can correct some systematic errors,the output point cloud data may still have some remnants of systematic errors between air stripes.Therefore,the errors must be checked and corrected prior to the utilization of DEM and other related digital products obtained from airborne LiDAR data.This paper thus analyzed several adjustment methods,summed up the technical process of strip adjustment based on the twelve-parameters model,and compared the results of studying the problem whether the ground control points are needed or not after the adjustment.It is shown that adjusting with ground control points can not only improve the internal accuracy but also improve the external accuracy effectively.