具有抵偿面任意带高斯正形投影直角坐标系的选择

一项工程的开始首先要选择正确的坐标系统,坐标系统选择得是否合适对整个工程质量至关重要,因此,我们要把坐标系统的选择作为首要重点工作对待。对于项目工程而言,建立独立坐标系统的目的是使投影长度变形控制在允许的误差范围之内。高斯-克吕格投影所建立的平面坐标系,或简称高斯平面直角坐标系,是大地测量、城市测量、普通测量、各种工程测量和地图制图中广泛采用的一种平面直角坐标系。本文根据正形投影的长度综合形变公式,推导出最佳方法。理论和实践均表明,该方法简洁、有效,能较好地抑制投影过程中的边长形变。本文就工程实践,介绍一种选取方法,研究建立城市抵偿坐标系解决变形问题。

Selection of Cartesian Coordinate System of Gaussian Orthographic Projection with Arbitrary Compensation Surface

The beginning of a project should first choose the correct coordinate system,the selection of the coordinate system is crucial to the quality of the entire project,so we should take the selection of the coordinate system as the first priority。For project engineering,the aim of establishing independent coordinate system is to control the deformation of projection length within the allowed error range。The plane coordinate system established by the Gauss-Kerr projection,or simply the Gaussian plane rectangular coordinate system,is a plane rectangular coordinate system widely used in Geodesy,urban measurement,general measurement,various engineering measurements,and map mapping。Based on the formula of length composite deformation of regular projection,the best method is derived,and the theory and practice show that the method is simple and effective,and can suppress the side long deformation in the process of projection。Based on engineering practice,this paper introduces a selection method to establish the urban compensation coordinate system to solve the deformation problem.