倾斜摄影像控点对山区河道建模精度的应用分析

Application and Analysis of Inclined Photographic Image Control Point to Modeling Accuracy of Mountainous River Channel

针对山区河道地形条件较为复杂,传统测量技术难以快速精确获取的问题,文章利用单镜头无人机“井字”航线获取倾斜影像数据,重点设计了不同像控点布设方案构建实景三维模型。通过模型精度对比分析,5种布设方案生产的测区模型在平面和高程精度上均满足1∶500成图比例尺的三维产品规范要求。山区河道实景三维建模,倾斜摄影像控点点对布设结果优于单点布设,控制点达到一定数量时,三维模型精度趋于稳定。结合山区河道实际地形综合考虑,研究成果为类似的山区河道像控点布设提供了参考依据。

In order to solve the problem that the terrain conditions of mountain river are relatively complex and the traditional measurement technology is difficult to obtain fast and accurate,this paper uses the single-lens UAV“Tic-tac-toe”route to obtain oblique image data,and focuses on designing different image control point layout schemes to build a real three-dimensional model.Through the comparative analysis of model accuracy,the precision of the measuring area models produced by the 5 layout schemes can meet the requirements of the three-dimensional product specification of 1∶500 mapping scale in plane and elevation.In the 3D modeling of mountainous river real scene,the result of spot pair layout is better than that of single point layout.When the control points reach a certain number,the accuracy of the 3D model tends to be stable.Combined with the actual topography of mountain river,the research results provide a reference for the layout of similar mountain river image control points.