抵偿面任意带投影法在高海拔地区GNSS控制网长度投影变形中的应用

Application of Compensated Surface Arbitrary Zone Projection Method in Length Projection Deformation of GNSS Control Network in High Altitude Areas

在工程建设过程中,GNSS控制网的精度对施工放样和工程质量的影响至关重要。文中通过分析长度投影变形的影响因素、长度投影变形算法以及不同情况下测量坐标系的选择方法,并以贵州省某抽水蓄能电站工程GNSS控制网为例,估算测区控制网在标准带国家坐标系下的长度投影变形,通过实践证明采用抵偿面任意带投影法可有效减弱高海拔地区GNSS控制网长度投影变形值,满足测区内投影长度变形小于等于25mm/km的要求,从而满足设计和工程建设的要求,为高海拔地区大比例尺测图平面坐标系的选取提供一定的借鉴作用。

In the process of engineering construction,the accuracy of GNSS control network is crucial for the construction layout and engineering quality.The article analyzes the influencing factors of length projection deformation,length projection deformation algorithm,and the selection method of measurement coordinate system in different situations.Taking the GNSS control network of a pumped storage power station project in Guizhou Province as an example,the article estimates the length projection deformation of the measurement area control network under the standard band national coordinate system.This test proves through practice that using the compensation surface arbitrary strip projection method can effectively reduce the projection deformation value of GNSS control network length in high-altitude areas,meet the requirement of projection length deformation within the survey area being less than or equal to 25mm/km,and thus meet the requirements of design and engineering construction.It provides a certain reference for the selection of large-scale mapping plane coordinate systems in high-altitude areas.