机载LiDAR航带拼接方法分析

Analysis of the methods of the inter-splicing for airborne LiDAR

随着机载LiDAR技术的发展,我国对高精度的数字产品的生产要求也在不断提高。机载LiDAR点云数据航带间拼接误差一直是影响数字产品的主要因素之一。因此,消除或减弱系统误差影响,提高数据精度具有重要理论意义和工程实用价值。本文对机载LiDAR点云航带拼接误差问题进行分析,以Leica ALS70机载点云数据为数据源,利用Graf Nav8.4软件、Leica Geosystems MFCPP软件、Micro StationV8软件及Terra Soild对某省机载LiDAR点云数据进行航带拼接方法的分析。本文首先利用检校场对点云数据系统误差进行了修正,航带间重叠区域高程偏差图初步分析,然后通过构架线对架次航线拼接进行了整体分析,最后利用区域内像控点资料对点云数据高程精度进行了改正。试验结果表明:该方法提高了点云数据拼接精度,在实际生产过程中提高了预处理的工作效率,提高数字产品的质量。

With the development of airborne Li DAR technology,it is also constantly improving for the high-precision 4 D production.It has always been one of the main factors for affecting the inter-splicing error of airborne Li DAR point cloud data.Therefore,It has important theoretical significance and engineering practical value for improving data accuracy with eliminating or weakening the influence of system errors.This paper analyzes the problem of splicing error of airborne Li DAR point cloud with using Leica ALS70 airborne point cloud data as data source,and using Graf Nav8.4 software,Leica Geosystems MFCPP software,MicroStationV8 software and Terra Soild to analyze the airborne splicing method of airborne Li DAR point cloud data in a Province.In this paper,the error of the point cloud data system is corrected by the calibration field,and the elevation deviation map of the overlapping area between the navigation belts is analyzed.Then,the overall analysis of the splicing of the sub-routes is carried out by the frame line.Finally,the point cloud data elevation is calculated by using the image control points in the area.The experimental results show that the method improves the stitching precision of point cloud data,improves the working efficiency of preprocessing and improves the quality of digital products in the actual production process.