基于椭球膨胀法建立独立坐标系在工程中的应用探讨

Application of establishing an independent coordinate system in projects based on ellipsoids expansion method

针对测区远离投影中央子午线或测区平均海拔较高的工程,若使用国家坐标系统会导致测边的投影变形,难以满足工程的精度要求。文中运用椭球变换原理,采用椭球膨胀法建立独立坐标系,结合工程实例,表明该方法适宜应用于此类GPS工程控制网的建立,满足工程测量规范要求。

Among projects where the testing zone is far away from the central meridian or the altitude is higher thanthe average level, the trilateration projection will be distorted with the national coordinate system, so that it is diffi-cult to meet the accuracy requirements of the project. In the present paper, the independent coordinate system is es-tablished based on ellipsoidal expansion method. And engineering practices show that the method is suitable in suchcases of the establishment of GPS Engineering Control Network and can meet the requirements of engineering sur-veys.