无人机数字摄影测量技术在电网铺设地形测绘中的应用

Application of Unmanned Aerial Vehicle Digital Photogrammetry Technology in Topographic Survey of Power Grid Laying

地形数据的获取通常选用实地探测或常规航空测量的方式,而这两种方式都存在用时较长的问题,无法达到地形测绘的要求。为此,提出对无人机数字摄影测量技术在电网铺设地形测绘中的应用进行研究。通过无人机飞行平台设置数码相机采集得到实验区影像。依据实验区控点布设原则完成像控点布控。利用无人机数字摄影影像输入、内定向、连接点产生等实现空三加密,完成电网铺设地形的测绘。通过相机校验参数调整影像畸变差,利用多项式模型对高程调整值进行调整,经最小二乘拟合,降低高程检测点处拟合曲线的调整值和实际值差异。通过实验进行相机校验、无人机航摄误差分析和内业数据处理准确性分析,得出以下结论:纠正后影像符合实际条件;采集影像均符合技术要求;测验点平面误差和高程中误差均满足测绘要求。

The acquisition of topographic data usually adopts the methods of field survey or conventional aerial survey,but these two methods have the problem of long time,which can not meet the requirements of topographic mapping.Therefore,the application of UAV digital photogrammetry technology in topographic mapping of power grid laying is studied.Digital cameras were set up on the UAV flight platform to acquire the image of the experimental area.According to the principle of placement of control points in the experimental area,the image control points are controlled.Using UAV digital photography image input,internal orientation,connection point generation,etc.to achieve air-to-air three encryption,complete the survey and mapping of power grid laying terrain.The camera calibration parameters are used to adjust the image distortion,and the polynomial model is used to adjust the elevation adjustment value.The least square fitting is used to reduce the difference between the adjustment value and the actual value of the fitting curve at the elevation detection point.Through the camera calibration,UAV aerial photography error analysis and data processing accuracy analysis,the following conclusions are drawn:the corrected images meet the actual conditions;the collected images meet the technical requirements;the plane error of the test points and the mid-altitude error meet the requirements of surveying and mapping.