三维激光点云下的不规则三角网法土方计算及精度分析  

Earthwork Calculation and Accuracy Analysis of Irregular Triangulation Method Based on 3D Laser Point Cloud

作　　者：高金彬 刘建岭 花向红[1] 水浩奇 GAO Jinbin;LIU Jianling;HUA Xianghong;SHUI Haoqi(School of Surveying and Mapping,Wuhan University,Wuhan 4300079,China;Dongying Investigation Surveying and Mapping Institute,Dongying 257091,China)

机构地区：[1]武汉大学测绘学院,湖北武汉430079 [2]东营市勘察测绘院,山东东营257091

出　　处：《城市勘测》2023年第6期151-155,共5页Urban Geotechnical Investigation & Surveying

基　　金：国家自然科学资金项目(42271452,42201457)。

摘　　要：不规则三角网法是土方量计算的常用方法,其计算精度受高程中误差、地形、三角网平均边长等因素的影响。为研究影响土方计算精度的因素,依据误差传播定律,建立不规则三角网法土方计算精度数学模型。实验部分使用地面三维激光扫描仪获取实地点云数据构建数字地面模型(digital terrain models,DTM)模拟真实地形得到区域土方量真值,然后利用不规则三角网法计算区域土方,对高程中误差、边长进行精度影响分析。实验表明三角网边长对土方量计算精度影响显著,需要严格把控;而高程中误差对土方量计算精度影响不明显,将点位的高程精度控制在厘米级即可。Irregular triangulation method is a common method for fill calculation,and its calculation accuracy is affected by factors such as mean square error of height,terrain,and average side length of the triangulation.In order to study the factors that affect the calculation accuracy of fill,according to the law of error propagation,a mathematical model of fill calculation with irregular triangulation method is established.In the part of the experiment,the terrestrial laser scanner was used to obtain point cloud data to construct DTM to simulate the real terrain to get the true value of regional fill.Then the triangular irregular network method was used to calculate the regional earthwork,and the influence of the accuracy on the errors in elevation and side length was analyzed.The research shows that the average side length of the triangulation has a significant impact on the calculation accuracy of fill,and it needs to be strictly controlled;while the mean square error of height has no obvious effect on the calculation accuracy of fill,and the elevation accuracy of the point can be controlled at the centimeter level.

关 键 词：不规则三角网 点云 土方量计算 精度分析 

分 类 号：P225.2[天文地球—大地测量学与测量工程] P258[天文地球—测绘科学与技术]