基于无人机系统制作大比例尺正射影像

与其它移动测图平台相比,无人机系统具有机动、灵活、低成本等特点,因此非常适合应用于大比例尺航空摄影测量.与专业的量测相机相比,非量测数码相机的价格相对低廉、体积小、重量轻,尤其适于作为小型的无人机系统的影像获取设备.本文介绍了一个以数码相机作为影像获取设备的无人机系统;给出了数码相机的标定和畸变分析过程;并提出了基于相对定向、三视张量、自由网平差方法逐步剔除粗差的自动空中三角测量过程.最后的实验表明,以无人机系统获取的低空数码影像生产的正射影象可以达到 1:2000 的精度指标.

UAVs for Generation of Digital Large-Scale Orthophotos

In comparison with other mobile mapping platforms, UAV(Unmanned Aerial Vehicle) has many good characteristics such as low coat, simple manipulation, flexbility etc, therefore it is a suitable alternative solution to application for photogrammetry. Non-metric digital cameras are relatively inexpensive, readily avalailable, small volume, light weight compared to metric camera systems, thus they are suitble as the tool for image acquisition in mini UAVs. This paper gives an overview about the UAV system with non-metric cameras. Moreover,the process is given about non-metric camera calibration as well as distortion analysis. The automatic aerial triangulation process then follows, in which incorporate methods are put forword for efficient blunder detection and elimination based on relative orientaion, trifocal tensor and free net bundle adjustment. Finally,experiments on digital orthophotos generated with low attitude aerial photographs col- lected from a test flight using the UAV system have shown that the accuracy is able to meet those required for national map standards at scale of 1:2000.