多片前方交会法无人机测图技术

Unmanned aerial vehicles mapping technology of multiple images space forward intersection

针对传统数字摄影测量中,使用双片前方交会方法量测地面物点的坐标,因同名光线交会角大小限制而不利于提高测点坐标的精度问题,该文提出了基于无人机高重叠度航摄影像的多片前方交会测图方法。使用该方法进行地物坐标量测时,不受交会角大小的限制,同时引入最小二乘原理,可获得高精度的物点坐标。利用某长江大桥桥址带状测区无人机航摄影像数据,进行双片前方交会、三片前方交会及四片前方交会测图精度的对比分析。结果显示,基于无人机高重叠度影像的多片前方交会测图技术能有效提高无人机航测大比例尺地形图的精度。

Aiming at the problem that space forward intersection with double images in traditional digital photogrammetry is used to get the coordinates of terrain points,which counts against accuracy owing to the limitation of intersection angles,the multiple images space forward intersection based on high overlap images obtained by unmanned aerial vehicle（UAV）was brought forward,with least square method,to measure high precision of coordinates without being limited by intersection angle,and improve the accuracy of UAV aerial large scale mapping.With UAV aerial image research data of a banded area of the Yangtze River bridge,space forward intersection mapping accuracy of double images,three images and four images were compared and analyzed.Results showed that the multiple images space forward intersection mapping technology based on UAV high overlap aerial data could improve UAV aerial mapping precision effectively.