测绘通报 ›› 2017, Vol. 0 ›› Issue (4): 80-84.doi: 10.13474/j.cnki.11-2246.2017.0125

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一种新型三维激光扫描隧道测量点云坐标定位方法的精度评估

尤相骏1, 詹登峰2   

  1. 1. 上海数联空间科技有限公司, 上海 200433;
    2. 北京麦格天宝科技股份有限公司, 北京 100043
  • 收稿日期:2016-08-18 修回日期:2016-12-18 出版日期:2017-04-25 发布日期:2017-05-05
  • 作者简介:尤相骏(1978—),男,硕士,研究方向为精密工程测量和建造信息模型化(BIM).E-mail:karlyou@qq.com

Accuracy Evaluation for a New Positioning Method of Point Cloud Acquired by 3D Tunnel Scanning Technology

YOU Xiangjun1, ZHAN Dengfeng2   

  1. 1. Shanghai iSpatial Co. Ltd, Shanghai 200433, China;
    2. Beijing Map Science & Technology Co. Ltd, Beijing 100043, China
  • Received:2016-08-18 Revised:2016-12-18 Online:2017-04-25 Published:2017-05-05

摘要: 提出了一种基于三维激光扫描仪特殊定位硬件装置和七参数坐标转换算法,对每个扫描测站点云利用最近的隧道控制点进行绝对定位,将多个隧道扫描测站数据不经过拼接就统一转换成隧道控制测量坐标系坐标的方法——点云绝对定位法,并应用误差传播理论和相应数值模拟计算对该方法的测量成果进行精度评估和重要误差来源分析。最后得出在一定条件下采用该方法获得的隧道扫描测量成果可以满足城市地铁测量规范对竣工测量精度要求的结论。

关键词: 隧道扫描, 点云绝对定位法, 点云坐标精度, 点云坐标传递

Abstract: A new method based on a special accessory made for 3D laser scanner and 7-parameter coordinate transformation algorithm is introduced to directly locate every 3D tunnel scan station with the closest tunnel control point and transform the point cloud from the relative scanner coordinate system into the uniformed tunnel control coordinate system without registration of multiple scans, which is called "APM" method(absolute positioning method). Error propagation analysis and corresponding numerical calculation are also used to evaluate the accuracy of APM results and the key error source. In the end, the tunnel scan results acquired with the APM method under certain preconditions are proved to meet the accuracy requirements of tunnel as-built survey based on the Code of Urban Rail Transit Engineering Surveying.

Key words: tunnel scanning, absolute positioning method of point cloud, coordinates accuracy of point cloud, coordinate transformation of point cloud

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