无人机影像采集方式对川中丘陵航测精度的影响

Influence of UAV Image Acquisition Ways on Aerial Photogrammetry Accuracy in the Hilly Regions of Central Sichuan

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摘要针对川中丘陵地形起伏对航测精度与效率影响的问题,以典型丘陵区为例,采用实时仿地、DSM(digital surface model)仿地、定高飞行影像采集方式,处理低、中、高级别点云,从影像重叠度、点云密度、航测高程精度及作业效率等对9组处理比较研究。结果表明:(1)在影像重叠度方面,仿地飞行在海拔相对较高区域重叠度优于定高飞行;(2)对点云密度而言,点云密度高低会显著影响处理时间与内存占用的情景下,对部分地物几何特征细节刻画的表现效果;(3)关于航测高程精度,DSM仿地最高,实时仿地次之,定高飞行最低,中、高点云密度的航测精度较高。经效率-精度权衡,实时仿地、点云密度中为最优方案。研究结果可为丘陵区快速高精度地形测绘提供参考。 To address the influence of topographic undulations on the accuracy and efficiency of aerial photogrammetry in the hilly areas of central Sichuan,taking a typical hilly area as a case study,we used three image acquisition methods,including real-time terrain-following flight,DSM(Digital Surface Model)-based terrain-following flight,and constant altitude flight,to process point clouds at low,medium,and high density levels.We compared nine datasets in terms of relative height difference between image overlap,point cloud density,and aerial survey elevation accuracy.Key findings include that①in terms of image overlap rate,terrain-following modes(real-time and DSM)outperform fixed-altitude flight in overlap rate within high-altitude regions.②In terms of point cloud density,higher point cloud densities significantly increase processing time and memory consumption,while compromising the geometric detail reconstruction of certain features.③In terms of elevation accuracy,DSM-based terrain-following achieves the highest accuracy,followed by real-time terrain-following,with fixed-altitude flight ranking lowest.Medium-and high-density point clouds exhibit superior accuracy.Through efficiency-accuracy trade-off analysis,the optimal solution combines real-time terrain-following with medium-density point clouds.This study provides practical insights for rapid,high-accuracy topographic mapping in hilly regions.

作者李昊然赵宇张建勇崔茜杜姿影曹玉刚徐浩伦 LI Haoran;ZHAO Yu;ZHANG Jianyong;CUI Qian;DU Ziyin;CAO Yugang;XU Haolun(College of Earth and Planetary Sciences,Chengdu University of Technology,Chengdu 610059,China;Key Laboratory of Digital Mapping and Land Information Application,Ministry of Natural Resources,Wuhan 430079,China)

机构地区成都理工大学地球与行星科学学院自然资源部数字制图与国土信息应用重点实验室

出处《地理空间信息》 2025年第6期74-78,共5页 Geospatial Information

基金自然资源部数字制图与国土信息应用重点实验室开放研究基金资助项目(ZRZYBWD202204) 国家自然科学基金资助项目(42401541)。

关键词实时仿地飞行影像重叠度点云密度航测高程精度川中丘陵区 real-time terrain-following flight image overlap rate point cloud density aerial survey elevation accuracy hilly areas of central Sichuan Province

分类号 P231 [天文地球—摄影测量与遥感]

作者简介第一作者:李昊然(2000-),硕士研究生,主要从事无人机测绘以及国土资源遥感应用工作,E-mail:1758712356@qq.com;通信作者:张建勇(1989-),副教授,硕士生导师,研究方向为国土资源遥感,E-mail:jyzhang@cdut.edu.cn。