不同椭球与投影参数的两套高斯平面坐标的变换方法

Transformation method of two sets of Gaussian plane coordinates with different ellipsoids and projection parameters

不同时期建立的坐标系可能采用不同参考椭球与投影参数,研究高斯投影坐标间的变换方法,具有实用价值。研究不同椭球参数及投影参数对高斯投影坐标的影响特性,除不同中央经线对投影坐标影响的非线性特性较强外,其它因素对区域坐标系坐标的影响几何都是线性的,因此只要使两种坐标系的中央经线近似一致,就能采用线性变换模型实现两种坐标系的变换。文中利用广州市平面坐标系与CGCS2000平面坐标系之间变换为实例,验证文中技术方法可行性。文中方法为其他城市进行CGCS2000坐标与城市独立坐标的变换具有借鉴作用。

The coordinate system established in different periods may use different reference ellipsoids and projection parameters to study the transformation method between Gaussian projection coordinates which has practical value.This paper studies the influence of different ellipsoid parameters and projection parameters on Gaussian projection coordinates.In addition to the strong nonlinear characteristics of the influence of different central meridians on the projected coordinates,the influence of other factors on the coordinates of the regional coordinate system is linear.Therefore,as long as the central meridians of the two coordinate systems are approximately identical,a linear transformation model can be used to transform the two coordinate systems.Taking the transformation between Guangzhou city coordinate system and CGCS2000 plane coordinate system as an example,the feasibility of this method is verified.Therefore,this method can be used as a reference for the transformation of CGCS2000 coordinates and urban independent coordinates in other cities.