基于无人机倾斜摄影测量的大比例尺地形图测绘方法

Large Scale Topographic Mapping Method Based on UAV Tilt Photogrammetry

针对利用正射影像绘制地形图时远地地物遮挡近地地物的问题,研究基于无人机倾斜摄影测量的大比例尺地形图测绘方法。将无人机倾斜影像通过空三加密、点云数据匹配、三维TIN构建与纹理映射建立实景三维模型,并绘制地形图。实例证明,通过该方法绘制的地形图平面方向中误差为0.070 m,高程方向中误差为0.066 m,点位中误差为0.096 m,此精度满足大比例尺地形图的绘制要求,应用优势明显。

Aimingat the problem of shielding the distant ground objects from the near ground objects when using orthophoto to draw topographic map, the large scale topographic map mapping method based on tilt photogrammetry by UAV is studied. The tilt image of UAV is used to establish the three-dimensional model of real scene through space three encryption, point cloud data matching, three-dimensional TIN construction and texture mapping, and to draw topographic map. An example shows that the mid-error of the topographic map drawn by this method is 0.070 m in plane direction, 0.066 m in elevation direction, and 0.096 m in point position. This accuracy meets the requirements of large scale topographic map, and has obvious application advantages.