基于Cook距离的三维坐标转换控制点优选  

Preferred Choice of Control Points of Three-dimensional Coordinate Transformation Based on Cook Distance

作　　者：陆游 袁豹[2] 

机构地区：[1]广东天信电力工程检测有限公司,广州市510600 [2]河海大学地球科学与工程学院,南京市210098

出　　处：《勘察科学技术》2014年第3期18-21,共4页Site Investigation Science and Technology

摘　　要：三维坐标转换是工程应用中经常遇见的一项较为复杂的工作,用于坐标转换参数求解的控制点在时间和空间因素的作用下会产生精度损失。该文引入Cook距离这一评价方法来判断各个控制点对坐标转换参数的影响程度,筛选参与坐标转换参数解算的控制点,考虑到控制点在两套坐标系下的坐标均含有偶然误差,建立基于总体最小二乘方法的布尔萨坐标转换模型。经过实例计算分析,得到结论:基于Cook距离优选出的控制点可以求得更加准确的坐标转换参数。Three-dimensional coordinate transformation is a complex work and often encountered in engi- neering applications, the precision of control points for solving coordinate transformation parameter will be effected by time and space. This paper introduces the Cook distance to evaluation the degree of influence in solving coordinate transformation parameter caused by different control points, select the control points to solving coordinate transformation parameter. Taking into account the coordinate of control points in two sets of coordinates both have accidental error, and establish Bursa coordinate transformation model based on total least squares. Getting a conclusion after instances of calculation and analysis： the control points selected by Cook distance can obtain more accurate coordinate transformation parameters.

关 键 词：坐标转换 控制点 COOK距离 总体最小二乘 布尔萨模型 

分 类 号：P226.3[天文地球—大地测量学与测量工程]