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以往GPS建立的平面坐标系属法线系统,而选线设计均在垂线和水准面为基准的坐标系统下进行,其数据未做两化改正而直接用于施工放样。为了消除因GPS引入线路勘测而引发的法线系统坐标系与垂线系统坐标系之间的矛盾,本文采用逆向两化改正的方法,从理论上提出了直接用GPS建立垂线和水准面系统下平面坐标系的技术路线,并推导出逆向两化改正及其精度评定公式。
In the past, the plane coordinate system established by GPS belongs to the normal system, while the line selection design is carried out under the coordinate system with the vertical line and the level as the reference. The data is not used to correct the two variables and is directly used for setting out the construction. In order to eliminate the contradiction between the normal system coordinate system and the vertical system coordinate system caused by the introduction of GPS in-line survey, this paper adopts the method of reverse bi-directional correction to establish the vertical line and the level system Under the plane coordinate system of the technical route, and deduced two reverse correction and its accuracy evaluation formula.