尼日利亚铁路坐标系统的选择与研究

Select and Research of the Coordinates System in Nigeria

为尼日利亚铁路项目的勘测与设计选择合适的坐标系统.通过对UTM(Universal Trans-verse Mercator)投影变形规律的研究及与GKTM(Gauss Krugger Transverse Mercator)投影的比较,指出了UTM投影的不足,提出了尼日利亚铁路坐标系统的模式.采用不同投影高程面的1°分带GKTM投影坐标系具有较强的优越性.

The national coordinate system used in Nigeria railway is the Universal Transverse Mercator projection,while China adopts the Gauss Krugger Transverse Mercator projection（GKTM）.This paper studied the difference between UTM and Gauss（GKTM） projections and the regulation of projection deformation,and proposed that the Gauss Krugger Transverse Mercator projection（GKTM） model of the coordinates system should be adopted for the Nigeria railway,which.could be greatly beneficial to the survey,design,construction and referencing of the Nigeria railway project.