顾及高程归化的斜轴墨卡托圆柱投影的应用研究

发布时间：2018-03-04 14:22

本文选题：大型调水工程　切入点：斜轴墨卡托圆柱投影　出处：《水利水电技术》2017年03期 　论文类型：期刊论文

【摘要】：针对某些大型调水工程东西跨距较大的特点,提出了特殊的减小长度变形方法,即将原参考椭球膨胀至高程投影面,再将椭球面大地坐标投影至圆球面,然后以工程线路的中轴线为伪中央子午线进行斜轴墨卡托圆柱投影。结果表明:斜轴墨卡托圆柱投影可建立统一的、满足投影变形要求的工程独立坐标系统,可同时减小高程归化引起的长度变形和高斯投影长度变形,避免了由于多个分带导致的误差和频繁的坐标转换;对于大型调水工程投影变形应要求不大于10 mm/km,则工程线路至线路的中轴线的距离应不大于28 km,即投影带的宽度应不大于56 km。通过与变形椭球高斯投影方法对比可知,斜轴墨卡托圆柱投影方法综合投影变形与前者相当,但在圆球面上进行计算和分析相对简单方便,容易推广使用。
[Abstract]:In view of the large span between east and west of some large water diversion projects, a special method to reduce the length deformation is put forward, that is, the original reference ellipsoid expands to the elevation projection plane, and then the ellipsoid geodetic coordinates are projected to the spherical surface. Then using the central axis of the engineering line as the pseudo-central meridian to carry out the oblique meridian meridian projection, the results show that the skew axis Mercator cylindrical projection can establish a unified engineering independent coordinate system which meets the requirements of projection deformation. The length deformation caused by elevation normalization and Gao Si projection length deformation can be reduced at the same time, and the error caused by multiple banding and frequent coordinate transformation can be avoided. For large water diversion projects, the projection deformation should not be more than 10 mm / km, then the distance from the project line to the central axis of the line should not be more than 28 km, that is, the width of the projection belt should not be greater than 56 km. By comparing with the projection method of deformation ellipsoid Gao Si, it is known that, The synthetic projection deformation of the oblique Mercator cylindrical projection method is similar to that of the former, but the calculation and analysis on the spherical surface is relatively simple and convenient, and it is easy to be popularized.
【作者单位】：湖北省水利水电规划勘测设计院;
【基金】：湖北省水利重点科研项目(HBSLKY201608)
【分类号】：TV221;TV68

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