建立高海拔地区数字城市坐标系统的方法探讨

Discussion on the Method of Establishing Digital City Coordinate System in High Altitude Area

CGCS2000坐标系统是以参考椭球面为数学模型建立的,由于城市的地理位置和海拔高度千变万化,部分高海拔城市地面高度与参考椭球面存在较大差异,为使城市实地测量数据与CGCS2000坐标系统保持相对一致,满足变形精度要求,需要建立其与国家CGCS2000坐标系统相互联系的坐标系统。本文通过对投影变形和高程归化变形的特性及规律分析,探讨建立高海拔地区城市坐标系统的科学方法,为城市建设、工程施工提供技术依据。

The CGCS2000 coordinate system is based on the reference ellipsoid established mathematical model,due to the city's geographical location and altitude difference part of the myriads of changes,the high altitude city ground height and the reference ellipsoid,in order to make the city field measurement data and CGCS2000 coordinate system to maintain relatively uniform deformation meet the accuracy requirements,the need to establish contact with each other the national CGCS2000 coordinate system coordinate system.Based on the analysis of the characteristics and laws of projection deformation and elevation domestication,this paper discusses the scientific method of establishing urban coordinate system in high altitude area,so as to provide technical basis for urban construction and engineering construction.