澜沧江—湄公河航道项目坐标系的建立

Establishment of the Lancang—Mekong River channel project coordinate system

针对大跨度高海拔项目平面控制网建立过程中遇到的投影变形及精度要求问题,结合澜沧江—湄公河航道项目,对投影变形和高程投影面进行分析和论述,最后选择带有高程投影面的任意带高斯投影方法,并采用多投影带多投影面的方案建立项目坐标系。检测验证,该坐标系能够有效解决投影变形问题并满足项目精度要求,为类似的大跨度大高差的测绘项目提供了技术借鉴和参考。

In view of the problem of the projection distortion and precision requirement when establishing horizontal control network of large area and high altitude project,this paper analyzes and discusses the projection distortion and elevation projection plane based on the Lancang-Mekong River channel project. Finally we select the method of arbitrary zone Gauss-Krueger projection with elevation projection plane,and adopt the multiple projection zones and multiple projection planes scheme to establish the coordinate system. It is proved that this coordinate system can effectively solve the problem of projection deformation and meet the requirements of project precision,provide a technical reference for similar large-span and large-height surveying and mapping projects.