车载移动测量技术在既有高速公路改扩建勘测中的应用研究

Research on the Application of Vehicle-borne Mobile Mapping Technology in the Reconstruction and Expansion Survey of Existing Expressways

既有高速公路改扩建工程相比新建工程勘测精度要求更高,平面精度需达到5 cm,高程精度需达到2 cm。传统的测量手段存在作业效率低、获取信息量少、干扰正常交通秩序、人员安全难以保证等问题,很难满足大规模线路的勘测需求。针对高速公路勘测需求,提出了基于车载三维激光扫描技术的高速公路勘测方法,首先采用车载移动测量系统对线路进行扫描,然后利用靶标控制网纠正来提高点云成果精度,最后利用机器学习算法实现道路标线、横纵断面的自动提取。包茂高速改扩建工程应用表明,本方法的精度完全满足规范要求,获取的信息更加全面,测量效率、安全性更高。

Existing expressway reconstruction and expansion projects have higher requirements for survey accuracy than newly-built projects,the plane accuracy needs to reach 5 cm,and the elevation accuracy needs to reach 2 cm.Traditional measurement methods have problems such as low work efficiency,less information acquisition,interference with normal traffic order,and difficulty in ensuring the safety of personnel.It is difficult to meet the survey requirements of large-scale lines.A highway survey method based on vehicle-mounted three-dimensional laser scanning technology is proposed.Firstly,the vehicle-mounted mobile measurement system is used to scan the lines,then the accuracy of the high point cloud results is improved by using target control network correction.Finally,the automatic extraction of road marking and cross section is realized by using machine learning algorithm.The application of Baomao high-speed reconstruction and expansion project shows that the accuracy of the proposed method fully meets the requirements of the specification,the information obtained is more comprehensive,and the measurement efficiency and safety are higher.