仿地飞行在无人机倾斜航空摄影测量中的应用—以湖北鹤峰县为例

Application of ground imitation flight in UAV oblique aerial photogrammetry—taking Hefeng County,Hubei Province as an example

为解决无人机在倾斜摄影测量过程中,因航测区域内地形高差过大出现地面分辨率差异大、影像重叠度不足或倾斜模型数据精度较差的情况,本文以湖北鹤峰县地区的部分山区为研究对象,采用无人机仿地飞行方法替代传统的定高飞行方法进行倾斜摄影测量并构建三维模型,利用DP Mapper实景三维测图系统结合RTK外业实测数据对倾斜模型进行精度检查,结果表明无人机仿地飞行方法能够有效解决地形高差较大区域内的无人机倾斜摄影测量实施困难、精度较差的问题。

In order to solve the problem of large difference in ground resolution,insufficient image overlap or poor accuracy of tilt model data due to the large terrain height difference in the aerial survey area during the process of UAV oblique photogrammetry,this paper uses the data of some mountainous area in Hefeng Country,Hubei Provinceas research objects,the UAV ground imitation flight method is used to replace the traditional fixed-altitude flight method to carry out tilt photogrammetry and build a 3D model,and the DP Mapper real scene 3D mapping system is used combined with RTK field measurement data to check the accuracy of the tilt model.the results show that the UAV ground imitation flight method can effectively solve the problems of difficult implementation and poor accuracy of UAV tilt photogrammetry in areas with large terrain height difference.