基于ArcGIS的地物化成果各坐标系统向CGCS2000坐标转换研究

A study of transformation of the coordinate system from geophysical and geochemical results coordinate to CGCS2000 coordinate in ArcGIS

由于历史原因,现阶段已有的地质、物化探成果的坐标系统基本为WGS84、BJ54或Xi'an80系统,而根据国家测绘局关于全面使用CGCS2000坐标的要求,今后取得的各类成果的坐标系统应为CGCS2000坐标,这为已有成果的利用和综合研究的工作带来不便。Arc GIS作为一款专业的地理信息系统软件,在各行各业有着广泛的应用。笔者在简要介绍了Arc GIS内置坐标系统的同时,研究并推导了Arc GIS软件中莫洛金斯基坐标转换方法的计算公式,提出了不同椭球之间转换参数的求取及转换精度评定的方法,并通过实例进行验证。在此基础上,分析了各坐标系统在Arc GIS软件中向CGCS2000转换的具体思路及注意事项。

Due to historical reasons,the present coordinate systems of the geological,geophysical and geochemical exploration results are basically WGS84,BJ54 or XA80 systems; nevertheless,according to the NASG requirements on the overall use of CGCS2000 coordinates,in the future the coordinates for all kinds of results should be CGCS2000 coordinates,which causes inconvenient situation in using the results and in comprehensive research work. As a professional geographic information system software,Arc GIS has a wide range of applications in various walks. In this paper,the authors briefly introduced the Arc GIS built-in coordinate system,studied and deduced the calculation formula of the MOLODENSKY coordinate conversion method in Arc GIS,put forward the method to get the conversion and precision evaluation of transformation parameters between different ellipsoids,and cited practical examples for verification. On such a basis,the specific ideas and points for attention were analyzed for each coordinate system in the conversion of Arc GIS software to CGCS2000.