丘陵地DEM建模精度受像控点空间分布影响研究

Research on the Accuracy of Hilly DEM Modeling Influenced by the Spatial Distribution of Ground Control Points

为了探究像控点空间分布对DEM建模精度的影响,利用无人机摄影测量技术对6.25 hm^(2)丘陵区域进行DEM建模实验。通过在刺点过程中采用多种像控点平面和高程布设方式来研究DEM建模精度与像控点空间分布之间的关系。结果表明,在同等实验条件下,“边缘+中心”的平面布设方式和“高程梯次组合”的高程布设方式可获得更高的建模精度。实际应用中可参考研究结果优化像控点的空间布设方案。

In order to explore the spatial distribution influence of ground control points on the accuracy of hilly DEM modeling,we used UAV photogrammetry technology to conduct DEM modeling experiment on a 6.25 hm^(2) hilly area,and studied the relationship between DEM modeling accuracy and the spatial distribution of ground control points by using a variety of different ground control point plane and elevation distribution methods in the process of pricking points.The results show that under the same experimental condition,the plane distribution method of“edge+center”and the elevation distribution method of“elevation ladder combination”can obtain higher modeling accuracy.The spatial distribution scheme of ground control points can be optimized by referring to the above results in practical applications.