长距离、高落差公路测绘项目投影坐标系建立方法

Discussion on Establishment of Projection Coordinate System for Long Distance and High Drop Highway Surveying and Mapping Projection

投影变形值超限是测绘过程中常见问题,常用的解决办法是平移中央子午线、起用高程抵偿面来建立独立坐标系,达到控制投影变形值超限的目的。针对长线路、高落差公路工程项目的投影变形特点,提出阶梯式分段投影思路,分段进行变形改正,并对分段投影后各独立坐标系衔接及统一、线路定测里程在各独立坐标系中的连贯统一及阶梯投影坐标系的局限性提出了解决办法。

Projection deformation value exceeding the limit is a commom problem in survey and mapping,The commom solution is to translate the central meridian and use the elevation compensation surface,and establish independent corrrdinate system to control the projection deformation value exceedind the limit.This paper aims at the characteristics of projection deformation of long line and drop highway engineering projects,put forward the idea of stepwise projection,and correction the deformation by segmented projection.It also puts forward solutions to the connection and unification of independent corrdinate system,the consistency and unification of route location survey mileage in independent corrdinate system,and the limitation of step projection coordinate system.