基于卷积格网曲面拟合滤波算法的数字高程模型构建及质量评价  

Construction and quality evaluation of digital elevation model based on convolution grid surface fitting algorithm

作　　者：朱伟刚[1] 朱超 张亚球 魏海斌[2] ZHU Wei-gang;ZHU Chao;ZHANG Ya-qiu;WEI Hai-bin(College of Prospecting and Surveying Engineering,Changchun Institute of Technology,Changchun 130022,China;College of Transportation,Jilin University,Changchun 130022,China)

机构地区：[1]长春工程学院勘查与测绘工程学院,长春130022 [2]吉林大学交通学院,长春130022

出　　处：《吉林大学学报（工学版）》2021年第3期1073-1080,共8页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金面上项目(41871236)。

摘　　要：针对目前常用滤波算法结构复杂、工作效率较低和数字高程模型(DEM)成果评价方法单一等问题,提出了一种基于空间格网技术和卷积核计算的移动曲面拟合DEM滤波算法(CGS算法)和基于计算机图形学的DEM质量评价新方法。理论研究和工程实践结果表明:CGS算法相对于人工干预TIN算法可以更好地滤除植被、建筑物等各种非地面点。利用灰度共生矩阵、自相关函数、图像信噪比、基于Canny算子改进高斯波形提取的局部方差算法对DEM成果进行对比分析发现,采用CGS算法生成的DEM图像纹理均匀平滑,可以凸显出各种地形的细节特征,可有效抑制椒盐噪声的产生。本文提出的滤波算法和评价体系在理论上具有前瞻性,在方法上具有科学性、可重复性,可应用于实际项目工程,具有较强的现实意义。In view of the complex structure of the current commonly used filtering algorithms,low work efficiency and single Digital Elevation Model(DEM)results evaluation methods,this paper proposes a moving surface fitting DEM filtering algorithm based on spatial grid technology and convolution kernel calculation(CGS)and a new method of DEM quality evaluation based on computer graphics.The results of theoretical research and engineering practice show that the CGS algorithm can better filter out various non-ground points such as vegetation and buildings than the manual intervention of the TIN algorithm.The gray-level co-occurrence matrix,autocorrelation function,image signal-noise ratio,The improved local variance algorithm of Gaussian waveform extraction based on Canny operator are used to compare and analyze the results of DEM.It is found that the DEM image generated by the CGS algorithm has a uniform and smooth texture,which highlights the detailed features of various terrains and can effectively suppress the generation of salt-and-pepper noise.The filtering algorithm and evaluation system proposed in this paper are forward-looking in theory,scientific and repeatable in method,which can be applied to actual project engineering and have strong practical significance.

关 键 词：道路工程 卷积格网曲面拟合算法 计算机图形学质量评估 点云滤波 数字高程模型 

分 类 号：U41[交通运输工程—道路与铁道工程] TP79[自动化与计算机技术—检测技术与自动化装置]