一种“连续挂靠坐标系”构建的技术方法

A Technical Method of Constructing “Continuous Attached Coordinate System”

在海拔高、起伏大的地区,新建长距离带状公路,一般需要选择适当的投影面和投影带建立多个独立坐标系,从而控制边长综合变形满足规范要求,以保证大比例尺地形图测绘和施工放样的精度。为方便勘测设计阶段测图、用图和施工放样,需把多个独立坐标系统一为一个坐标系。结合西南地区某新建公路工程四等GPS控制测量实例,探讨了一种“连续挂靠坐标系”构建的方法,并进行了检测验证。结果表明,边长较差小于10 mm,边长相对误差小于1/30万,完全满足工程测绘与施工放样的要求。“连续挂靠坐标系”解决了传统多个高程抵偿投影面坐标系成果使用时频繁换算的问题,并可直接与原国家(地方)测绘成果进行衔接。

In the area with high altitude and great fluctuation, it is generally necessary to select appropriate projection surface and projection belt to establish multiple independent coordinate systems to control comprehensive side length deformation to meet specification requirements, to ensure the accuracy of large-scale topographic mapping and construction sample drawing. In order to facilitate mapping, drawing and construction setting out in survey and design stage, it is necessary to integrate multiple independent coordinate systems into one coordinate system. Combined with the fourth-class GPS control survey in a newly built highway project in Southwest China, a construction method of“continuous attached coordinate system”was explored. The results show that: the side length difference is less than 10 mm, and the relative error of side length is less than 1/300 000, which fully meets the requirements of engineering mapping and construction setting out. The“continuous attached coordinate system”solves the tedious problem of frequent conversion when using the traditional multi elevation compensation projection plane coordinate system, and can be directly connected with the original national(local) surveying and mapping results.