不同定向方法对倾斜摄影三维建模精度的影响研究

Influence of different orientation methods on the 3D modeling accuracy of oblique photography

本文针对地形条件复杂的城市建筑密集区域难以布设较多像控点问题,引入全球导航卫星系统(GNSS)组合定向方法,通过设计4种单一定向和两种组合定向方法,选择地形复杂的城市建筑密集区域进行试验,研究不同定向方法对倾斜摄影三维建模精度的影响。结果表明,在4种单一定向方法中,密集像控点布设方案模型成果精度最高,而实时动态测量(RTK)和动态后处理(PPK)单一定向模型精度相对较差且误差分布不均匀;少量像控点组合GNSS定向方案模型成果精度与密集像控点布设成果基本一致,成果误差较小且均匀分布,可避免单一GNSS定向方式的局限性,可靠性较高。因此,在地形条件复杂、难以布设较多像控点的地区,可采用少量像控点组合GNSS定向方式进行三维建模,这样既能保证建模精度,又能提高建模效率。

As to the problem that it is difficult to place more image control points in densed urban builtup areas with complex terrain conditions,a combined GNSS orientation method was introduced in this paper,the experiment is carried out in such area by designing four single orientation and two combined orientation methods and the influence of different orientation methods on the 3D modeling accuracy of oblique photography is stuldied.The results show that,among the four single orientation methods,the accuracy of the dense image control point layout model is the highest,and the single orientation model of RTK and PPK is relatively poor,and their error is distributed unevenly.While,the accuracy of the model with a small number of image control points combined GNSS orientation methos is basically the same as that of the dense image control points layout,it can break the limitations of the single GNSS orientation methos and the error is smaller but with uniform distribution and the good reliability.Therefore,a small number of image control points combined with GNSS orientation can be used for 3D modeling in areas with complex terrain conditions and difficult to place more image control points,which can not only ensure the modeling accuracy,but also improve the modeling efficiency.