摘要
针对倾斜摄影外业影像采集受到多种因素的影响,利用免像控的方式从影像数据采集前的无人机4个飞控参数(航向重叠度、旁向重叠度、相机角度、飞行高度)来分析真三维模型的质量。通过均匀设计试验来优选因素组合,在Context Capture软件中生成点云网格,使用全站仪测量9个检查点的累积空间位移差值,利用最小二乘法拟合计算与检查点的累计空间位移差,拟选3个方案建立数学模型。同时,对于检查点的布设位置进行了拟合分析,发现“田”字格的4个角点位置布设优于四边中心点的位置,拟合的数学模型至少可以满足低成本无人机免像控绘制1∶1000的模型精度限差。由数学模型确定的最优参数组合为航向重叠度65%、旁向重叠度85%、相机角度75°、飞行高度60 m,此时单个检查点的空间距离误差最小为0.57 m,对于倾斜摄影建立高精度地理信息模型参数化具有指导意义。
Many factors influence the field image acquisition of inclined photography.With the method of non-GCPS control,the true three-dimensional model is analyzed from the four factors of the UAV flight control parameters before the image data collection(course overlap,side overlap,camera angle and flight altitude).Through uniform design test to optimize the combination of factors,the point cloud grid is generated in Context Capture software.The cumulative spatial displacement difference of 9 checkpoint is measured by total station instrument.Using the least square fitting method,the cumulative spatial displacement difference of points is calculated and checked.Three schemes are selected to establish the mathematical model.At the same time,the location of the inspection point is fitted and analyzed.It is found that the four corners of the square block are better than the four center points of the four sides.The fitted mathematical model can at least meet the accuracy limit of 1∶1000,non-GCPS low-cost UAV.Through the mathematical model,the optimal combination of parameters is determined to be 65%of course overlap,85%of side overlap,75°of camera angle and 6 m of flight height.The minimum space distance error of a single inspection point is 0.57 m,a guiding significance for establishment parameterization of precision geographic information model by tilt photography.
作者
孙保燕
张小可
黄邦伟
姚学杰
周鑫
韦龙华
SUN Bao-yan;ZHANG Xiao-ke;HUANG Bang-wei;YAO Xue-jie;ZHOU Xin;WEI Long-hua(School of Architecture and Transportation Engineering,Guilin University of Electronic,Guilin 541004,China)
出处
《桂林理工大学学报》
CAS
北大核心
2021年第4期831-836,共6页
Journal of Guilin University of Technology
基金
广西创新驱动发展专项项目(桂科AA19182023)
广西科学研究与技术开发计划项目(桂科攻1598019-8)
广西研究生教育创新计划项目(YCSW2020164)。
关键词
免像控
倾斜摄影
重叠度
布设点
模型精度
non-GCPS
oblique aerial photography
overlap
layout point
model accuracy
