摘要
通过七参数空间坐标转换可将WGS84坐标转换至地方坐标,但由于地方坐标点的大地高通常不能精确已知,它对转换是否有影响?需进行研究。从最小二乘原理出发,推导了七参数的求取方法,分析了大地高误差对七参数的影响,以及由此对转换坐标产生的影响,从理论上证明了在地面上100km×100km的范围内,即使公共点中地方坐标的高程存在误差,其对坐标转换的影响仍然很小。
WGS84 coordinates can be transformed to local coordinates through seven-parameter space transformation, but the ellipsoidal height of local coordinates usually cannot be precisely known. It should be probed weather the imprecise height will affect the transformation. The least square approach is used for solving the transformation parameters. Moreover the changes of parameters caused by error of ellipsoidal height of local coordinates are deduced. Finally, it is demonstrated that even though the ellipsoidal heights are not precise enough, its influence on coordinate transformation can be ignored in the range of 100 km × 100 km.
出处
《大地测量与地球动力学》
CSCD
北大核心
2007年第3期25-27,38,共4页
Journal of Geodesy and Geodynamics
基金
新世纪优秀人才支持计划
关键词
WGS84坐标
地方坐标
空间转换
七参数转换
高程误差
WGS84, Local coordinates, space transformation, seven-parameter transformation, height error
