无控制点无人机倾斜摄影测量获取1∶500 DLG的方法研究

由于近些年无人机技术的兴起,数字线划图(DLG)采集的方式不再单一,人们开始使用无人机倾斜摄影测量的技术来获取DLG数据,但无人机倾斜摄影测量获取大比例尺DLG,需要布设多个控制点,实施过程耗时耗力,基于此,本文提出一种基于向量方位角的点位误差校正法,在无控制点的情况下获取大比例尺DLG。该方法通过无人机采集的POS数据对地面点坐标进行解算,以少量的特征检测点的点位误差作为位移向量,并计算该误差向量的坐标方位角,将观测向量的方位角平均值确定为误差偏移方向、平面中误差为偏移距离,对DLG进行整体误差校正。实验结果表明,通过该方法在无控制点采集的情况下,精度能够达到1∶500 DLG的要求,为无人机快速、高效地获取大比例尺DLG提供参考。

Research on 1:500 DLG Obtained by Tilt Photogrammetry of Unmanned Aerial Vehicle without Control Point

Due to the rise of drone technology in recent years,the digital line drawing(DLG)collection method is no longer single.People began to use drone tilt photogrammetry technology to obtain DLG data,but drone tilt photogrammetry acquisition of DLG requires multiple control points to be deployed,and the implementation process is time-consuming and labor-intensive.Based on this,this paper proposes a point position error correction method based on vector azimuth to obtain large-scale DLG without control points.This method uses the POS data collected by the drone to calculate the coordinates of the ground points,takes the point position error of a small amount of feature detection points as the displacement vector,and calculates the coordinate azimuth angle of the error vector,and the azimuth angle average of the observation vector as the error offset direction,the error in the plane as the offset distance,and perform overall error correction on DLG.The experimental results show that the accuracy of this method can reach the requirement of 1∶500 DLG without control point acquisition,which provides a reference for the UAV to quickly and efficiently obtain large-scale DLG.