高程抵偿面与中央子午线的最佳选取方法

Optimal Selection Method of Height Compensation Plane and Central Meridian

针对基于CGCS2000建设城市平面坐标系过程中最佳高程抵偿面与中央子午线难以确定的问题,通过分析比较,归纳优选有效控制高斯投影长度变形的高程抵偿面与中央子午线的最佳选取方法和详细计算模型,得出的一些有益结论对选取和确定城市平面坐标系具有一定的实际指导作用。另外,还通过不同区域实际算例,对最佳中央子午线和高程抵偿面选取方法——遍历搜索法进行验证。结果表明,遍历搜索法可快速准确地找到最佳中央子午线和高程抵偿面大地高,能有效解决当控制区域较大、地形起伏较大时的最佳城市平面坐标系的确定问题,对限制投影长度变形有较为明显的优势。

Aiming at the problem that it is difficult to determine the optimal height compensation plane and the central meridian in the process of building the city plane coordinate system based on CGCS2000,this paper summarizes the optimal selection method and detailed calculation model of the height compensation plane and the central meridian that control the length deformation of the Gauss Projection effectively through analysis and comparison.Some useful conclusions drawn have certain practical guiding effect on the selection and determination of the city plane coordinate system.In addition,this paper also verifies traversal search method that is the optimal selection method of central meridian and height compensation plane by practical examples in different regions.The results show that the traversal search method can find the central meridian and the optimal geodetic height of height compensation plane quickly and accurately,and solve the problem of determining the optimal city plane coordinate system effectively when the control area is large and the terrain fluctuates greatly.It has obvious advantages in limiting the deformation of projection length.