基于航空影像密集匹配点云的DEM快速更新精度分析  

Accuracy analysis of DEMfast updating based on densed matching point cloud of aerial images

作　　者：吴坤泽 马泽[1] 廖玉祥 WU Kunze;MA Ze;LIAO Yuxiang(Surveying and Mapping Insitute Lands and Resource Department of Guangdong Province,Guangzhou,Guangdong 510700,China)

机构地区：[1]广东省国土资源测绘院,广东广州510700

出　　处：《测绘技术装备》2025年第1期21-25,共5页Geomatics Technology and Equipment

摘　　要：近年来,随着数字高程模型(DEM)的更新频率不断增加,更新后的DEM质量精度评定问题也得到了越来越多的重视。本文基于航空影像密集匹配点云DEM快速更新方法,利用航摄影像进行空中三角测量,经过点云匹配和地形提取,得到了2 m格网的DEM更新成果,并对成果进行了质量分析和精度评定。结果表明,采用本文方法所获成果基本满足1:5000比例尺DEM精度要求。但考虑到变化区域位于建成区房屋密集处,附近有较高植被或植被覆盖区等,具有较大高差,滤波效果较差,为了满足更高比例尺DEM精度要求,本文还提出了一些合理化建议。The problem of the quality and accuracy of the updated digital elevation models(DEMs)assessing has been paid more and more attention in recent years with the increasing updating of DEMs.The DEM updating data in 2-meter grid are obtained in this paper by fast updating the densely matched aerial image point cloud DEM,carrying out aerial triangulation using aerial images,and matching point cloud and extracting the terrain information,and the quality and accuracy of the obtained data are as‐sessed and analyzed.It is found out that the mentioned data basically meets the requirements of the ac‐curacy of the DEM at the 1:5000 scale.However,the filtered data are not suitable for the changed areas located in places with large vertical differences such as the densely populated houses in built-up areas,and the places with larger vegetation or vegetation covered areas,some rational suggestions are put for‐ward to meet the accuracy requirements of DEMs at larger scales.

关 键 词：航空影像 密集匹配点云 数字高程模型更新 精度分析 

分 类 号：P237[天文地球—摄影测量与遥感]