无人机摄影测量大比例尺地形图精度及影响因素分析

Analysis of the Precision and Influencing Factors of Large Scale Topographic Maps in UAV Photogrammetry

为提高勘测效率,实际工程中常采用无人机航摄对其进行勘测,为分析无人机摄影测量的精度,本研究以某测区为研究对象,采用无人机航摄系统结合BRISK与SIFT算法进行影像匹配,分析像控点布设方案对其测量精度的影响,得出以下结论:在同一方案及同一检查点下,平面点位误差小于高程误差,说明采用无人机摄影对测区进行平面测量的准确性大于高程测量的准确性。像控点的布设方式会影响无人机摄影测量的精度,当在测区内部布置像控点或增加像控点的布置数量时,均可显著提高无人机摄影测量的精度。当像控点位于测区的边缘时,增加像控点数量对无人机摄影测量的精度影响较大,当在测区内部布置像控点时,像控点数量对无人机摄影测量精度的影响较小。

In order to improve survey efficiency,drone aerial photography is often used in practical engineering to conduct surveys.To analyze the accuracy of drone photogrammetry,this study takes a certain survey area as the research object,uses drone aerial photography system combined with BRISK and SIFT algorithms for image matching,analyzes the impact of image control point layout scheme on its measurement accuracy,and draws the following conclusion:under the same scheme and check point,the plane point position error is less than the elevation error,The accuracy of plane measurement using drone photography in the survey area is greater than that of elevation measurement.The layout of image control points can affect the accuracy of drone photogrammetry.When arranging image control points within the survey area or increasing the number of image control points,the accuracy of drone photogrammetry can be significantly improved.When image control points are located at the edge of the survey area,increasing the number of image control points has a significant impact on the accuracy of drone photogrammetry.When image control points are arranged inside the survey area,the number of image control points has a small impact on the accuracy of drone photogrammetry.