同参心不同基准面坐标转换在工程测量中的应用

Application of coordinate conversion with same reference center and different datum surfaces in engineering surveying

为了解决测区长度变形过大,不能满足工程测量精度要求的问题。阐述了产生长度变形的原因及长度变形对工程测量的影响,并采用建立测区椭球的方法控制长度变形,通过同参心不同基准面坐标转换将国家基准面下的高斯坐标转化为测区基准面下的高斯坐标。分析了建立测区基准引起的纬度变化对点位精度的影响。同时,为解决负高程引起的长度变形过大问题,提供了一种行之有效的方法。

This work aims to solve the problem of failing to meet the accuracy requirement of engineering measurement due to large length deformation of the survey area.The reasons of length deformation and its influence on engineering survey are described.The length deformation is controlled by the method of establishing the survey area ellipsoid.The Gaussian coordinates under the national datum are transformed into those under the datum of the survey area through same reference center and different datum surfaces.The influence of latitude change caused by establishing the datum of the survey area on point accuracy is analyzed.At the same time,an effective method is proposed to solve the large length deformation caused by negative elevation.