曲面拟合在GPS坐标转换中的应用

GPS由于其高精度、速度快、全天候的特点,在工程测量及城市工程网的建立、更新和改造中广泛应用。但是GPS测量结果为WGS-84坐标,而实际应用的坐标系往往是1954北京坐标系和1980西安坐标系。本文针对GPS坐标转换过程中由于利用公共点求解转换参数,而将原有坐标系中系统误差引入转换过程中的情况,探讨将曲面拟合法应用到坐标转换中来处理转换残差的可行性,并通过工程实例证明了该方法可行。

Curved Surface Fitting in the Application of the GPS Coordinate Transformation

Because the technology of GPS position has the prominent advantages of high precision, fast speed and all-weather, it is widely used in the engineering survey and setting-up, upgrading and transforming of the urban engineering work.However, the GPS measurement result in the WGS -84 coordinate, and the practical application of the coordinate system is often BJ -54 coordinate system and the Xi’ an 80 coordinate system. In this paper, aims at the use of public point of solving the transformation parameters in the process of GPS coordinates conversion, and introducing system error in the original coordinate system to the process of transforma-tion, to explore the feasibility of application of curved surface fitting method in coordinate transformation to deal with the transformation residual, and through the engineering example proves the feasibility of this method.