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在高速铁路测量中,要求在建立平面坐标系时应满足投影的长度变形不超过10 mm/km。对于大致呈东西走向的线路来说,建立高斯平面坐标系时,为了控制长度投影变形,就要分多个投影带进行投影,这样就产生了多个高斯平面坐标系。墨卡托投影,既可以满足长度变形值要求,又可以有效解决因分带过多而带来的坐标系不统一问题。研究了高斯平面坐标向斜轴墨卡托平面坐标的转换模型,并且结合某条高速铁路测量数据进行了计算、分析和实际应用,表明本文研究的方法是正确的。
In high-speed railway surveys, it is required that the length of the projection should not exceed 10 mm / km in length when establishing a plan coordinate system. For the roughly east-west route, in order to establish the Gaussian plane coordinate system, in order to control the length projection deformation, it is necessary to project a plurality of projection belts, thus generating a plurality of Gaussian plane coordinate systems. Mercator projection, both to meet the requirements of the length of the deformation value, but also can effectively solve the zoning caused by excessive coordinate system is not uniform problem. The conversion model of the Mercator plane coordinate of the inclined plane of the Gaussian plane is studied. The calculation, analysis and practical application of the measurement data of a high-speed railway show that the method in this paper is correct.