基于无人机倾斜摄影的露天矿边坡三维重建

Research on slope reconstruction technique based on UAV oblique photogrammetry

露天矿边坡几何形状由于自然条件以及采矿工艺的影响具有复杂性,传统的测绘方式难以进行全面描述。提出一种基于无人机倾斜摄影技术的全自动露天矿边坡三维重建方法,利用无人机搭载的数码相机获取矿区序列倾斜影像,通过特征提取、空三测量、多视影像密集匹配,构建不规则三角格网和纹理映射,自动重建出露天矿边坡三维模型。选取三门峡渑池某铝矿进行试验,结果表明,重建的三维模型可全面表达露天矿边坡整体形态和保持局部细节特征,而且具备高效低成本等特点,在露天矿三维地形滑坡动态监测和灾害分析方面具有重要意义。

Because of the complex natural condition and the difference of mining technology,the traditional surveying methods are difficult to describe the geometry of open-pit slope in a comprehensive way.A fully automatic open-pit slope reconstruction in three dimension based on UAV oblique camera technique is proposed.Unmanned aerial vehicle equipped with digital oblique cameras is used for image sequence acquisition in open-pit area,through feature extraction,aerial triangulation,dense matching,3D point cloud are generated,and then through irregular triangular gridding and texture mapping,3Dmodel of open-pit slope are reconstructed automatically.An open-pit slope of aluminum mine in Sanmenxia Mianchi city is selected for experiment,the results show that the reconstructed 3D model can not only fully express the overall shape of open-pit slope but also maintain local features,with the characteristics of high efficiency and low cost.It is an important significance in the field of three-dimensional terrain and landslide hazard analysis in open-pit mine.