无人机摄影测量三维建模与地形测量精度分析

Accuracy analysis of 3D modeling of UAV photogrammetry and topographic survey

当前利用多旋翼无人机倾斜摄影建立三维模型,已在大比例尺地形测图中广泛应用,相较于传统数字测图,其作业方式和效率均有了很大改变。本文采用飞马多旋翼无人机,搭载D-OP3000倾斜摄影模块,在某低山丘陵地貌区域获取高精度倾斜摄影数据后,利用Context Capture软件进行空三加密和三维建模,并采用山维科技EPS软件进行立体测图;同时对倾斜摄影和垂直摄影在免像控和有像控点不同方案的精度进行比较,验证了免像控方案空三精度、模型分辨率及地形测量成果质量能满足1∶1000比例尺地形图精度要求,有像控点方案高程精度较高,可满足1∶500大比例尺地形测图和土方工程量计算精度要求。

At present,the use of multi-rotor UAV tilt photography to establish 3D model for large-scale topographic mapping has been widely used,compared with the traditional digital mapping,in the operation mode and efficiency has changed a lot.In this paper,Feima multi-rotor UAV equipped with D-OP3000 tilt photography module is used to carry out high-precision tilt photography data acquisition in a low mountain and hilly landform area,then Context Capture software is used to carry out aerial triangulation and 3D modeling,and finally Sunway Survey EPS software is used to carry out stereo mapping.The accuracy comparison of tilt photography and orthophoto photography in different schemes without image control points and with image control points is implemented,and the aerial triangulation accuracy of image-control-free scheme is verified.The resolution of the model and the quality of topographic survey results can meet the accuracy requirements of 1∶1000 scale topographic map.The elevation accuracy of the scheme with image control points is higher,which can meet the accuracy requirements of 1∶500 large-scale topographic mapping and earthwork calculation.