无人机倾斜摄影测量不同像控点密度对地籍图成果精度的影响

Influence of Different Image Control Point Densities on the Accuracy of Cadastral Map Results in UAV Oblique Photogrammetry

为了降低倾斜摄影测量的像控点采集成本和缩短采集周期,以解决像控点测量费用高、周期长的问题,本文以实际项目为例,采用外业采集的特征检测点,针对不同密度像控点对地籍图成果精度的影响进行了探讨,并得出如下结论:一是随着像控点密度的增加,生产得到的地籍图成果精度也逐渐提高,但当像控点密度达到36个/km2时,其成果精度基本上不再随其密度的增大而提升;二是在像控点密度相同的条件下,实景三维模型的平面精度整体上比高程精度高。

In order to reduce the acquisition cost of image control points and shorten the acquisition period of oblique photogrammetry,and to solve the problem of high cost and long period of measurement of image control points,this paper takes an actual project as an example,uses the feature detection points collected in the field,and discusses the influence of different image control point densities on the accuracy of cadastral map results,the following conclusions are drawn:firstly,with the increase of the density of image control points,the accuracy of the cadastral map results produced will gradually improve,but when the density of image control points reaches 36/km2,the accuracy of the results will no longer improve with the increase of its density;secondly,under the condition that the densities of image control points is the same,the plane accuracy of the realistic 3D model is generally higher than the elevation accuracy.