Analysis of the Influence of Scanning Geometry on the Quality of Multi-beam LiDAR Point Cloud
余萌 1程军龙 1朱锋 1张小红1
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作者信息
1. 武汉大学测绘学院,湖北武汉,430079
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摘要
点云的几何精度、反射强度信息对于多线激光雷达(light detection and ranging,LiDAR)的实际应用有着重要的意义.针对扫描几何条件对点云质量的影响,本文构建了扫描距离、入射角度与多线激光雷达信号衰减的模型关系,从理论上分析了扫描距离、入射角度对点云几何精度、反射强度的影响,提出了一种基于平面拟合的点云质量评估方法.在5～50 m的扫描距离、0°～60°的扫描入射角情况下,对3种多线激光雷达进行了测试.实验结果表明,随着扫描距离和入射角度的增加,多线激光雷达的测距中误差逐渐增加,点云反射强度准确性逐渐降低.
Abstract
For the practical application of multi-beam Li-DAR,the geometric precision and reflection intensity informa-tion in the point cloud are extremely important. In this paper,a model is constructed to fit the relationship between scanning distance,incident angle,and multi-line LiDAR signal attenua-tion,and the influences of scanning distance and incident an-gle on point cloud geometric accuracy and reflection intensity are theoretically analyzed,with the goal of determining the im-pact of scanning geometric factors on point cloud quality. A plane fitting-based method for assessing point cloud quality is proposed. At scanning distances ranging from 5m to 50m and scanning incidence angles ranging from 0° to 60°,three types of multi-line LiDARs are examined. The findings of the ex-periments reveal that when the scanning distance and inci-dence angle grow,the inaccuracy in multi-line LiDAR range increases,while the accuracy of point cloud reflection intensi-ty drops.
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