基于EGM2008精化模型的无人机免像控地形测量应用研究

Research on Topography Surveying Application of UAV Photography with No Image Control Point Based on Refined EGM2008 Model

本研究利用无人机免像控倾斜摄影,开展1∶500和1∶1000地形测量实验,探讨无人机免像控倾斜摄影用于大比例尺地形测量可行性、精度以及相关技术方案。研究过程中采用具有RTK+IMU的大疆M300 RTK无人机进行倾斜摄影,利用局部精化后的EGM2008似大地水准面模型对无人机POS参数进行高程异常改正,然后进行空三解算、立体建模和DLG采集,最后通过地面平高控制检查点对照免像控的测量成果进行比较和精度评定。结果表明:利用具有GNSS RTK+IMU的无人机开展免像控倾斜摄影测量,其模型平面位置中误差和高程位置中误差均满足相关规范要求。

This study evaluated the feasibility and accuracy of Unmanned Aerial Vehicle(UAV)obstacle aerial photography with no image control point in applications of large scale topographic surveying,and investigated related technology solutions.The aerial obstacle photograph was carried out using DJI M300 RTK UAV witch was integrated with RTK and IMU.The locally refined EGM2008 model was then applied directly to calculate the height parameter of POS.Then the EGM2008 corrected POS parameters were inputted to DJI Terra software for analytical aerial triangulation and 3D modeling.By comparing the positions of ground checking points with the values obtained for the same checking points from photograph with no image control point,we evaluated the accuracy of UAV obstacle aerial photography and conclude that the accuracy of measurements obtained using obstacle aerial photography with no image control points meet the specifications for large scale topographic surveying and mapping application.