斜圆柱投影及其对GPS空间坐标的转换模型

Model of Oblique Cylindrical Projection for Transforming GPS Space Coordinates to Plane Coordinates

用GPS布设大面积工程平面控制网时 ,测得的空间直角坐标通常按等角横切椭圆柱投影方式来转化至独立平面坐标 ;当东西跨度较大时 ,往往长度变形难以控制 .为此介绍了斜圆柱投影的计算方法 ,对于呈近似直伸型的线路工程来说 ,使斜圆柱投影相切中心线沿工程区域中心线 ,从而保证任何点位均在投影中心线的附近 ;

In order to establish GPS horizontal control of highway engineer,the observed GPS rectangular coordinates are usually transformed to plane rectangular coordinates by means of inverse cylindrical projection.If longitudinal length of the survey area were very long,distance distortion would not be limited effectively.This paper describes a method of oblique cylindrical projection.In near straightway highway engineer area,making the center line of projection along center line of engineer area,any surveying point will be near the center line of projection,and distance distortion can be limited efficiently.