无人机倾斜摄影测量土方计算及精度评定

UAV tilt photogrammetry earthwork calculation and accuracy evaluation

无人机倾斜摄影技术的不断发展为土方测量中存在的受地形限制,费时耗力等问题提供了解决途径。本文详细阐述了结合PhotoScan软件进行无人机倾斜摄影土方计算的方法,介绍了点云分类方法与非地面点高程值修正方法。通过对地面控制点、点云分类方法和非地面点高程等因素进行分析,提出了地面控制点布设优化三原则,并利用RTK土方计算结果对无人机倾斜摄影测量土方计算结果进行精度分析。结果表明:利用无人机倾斜摄影技术进行土方计算,不仅能够简化内外业工作流程,降低生产成本,同时,通过对地面控制点布设、点云分类方法和非地面点高程改进方法等影响因素进行优化,还能够在一定程度上提高土方计算的精度。

With the development of the tilt photography technology of the unmanned aerial vehicle(UAV),it provides a solution to the some difficult work in earthwork measurement,such as terrain limitation,time-consuming and labor-intensive.In this paper,a method of earthwork calculation is described with UAV tilt photography supporting by PhotoScan software.The classification method of point cloud and the value correction method of non-ground point elevation are introduced.By analyzing the ground control points,point cloud classification methods and non-ground point elevations,this paper proposes three principles for optimizing non-ground point layout.The accuracy of the earthwork calculation of tilt photography is verified with the real-time kinematic(RTK)GPS method.The result shows that the use of UAV tilt photography technology in earthwork calculation can not only simplify the on-field and in-door survey work,but also save cost.The accuracy of earthwork calculation can be improved through properly setting ground control points,improving point cloud classification,correct non-ground point elevation.