基于CGCS2000的2000天津城市坐标系建立

The Establishment of 2000 Tianjin Urban Coordinate System Based on CGCS2000

天津市上一代城市坐标系为1990年天津市任意直角坐标系,该坐标系精度较差,已无法满足天津城市建设发展需求,因此天津市亟须建立新一代城市坐标系。本文结合天津市地理特点,确定了坐标系建立过程中的投影方式及中央子午线的选取原则,经试算,最终确定了坐标系参数,建成天津市新一代城市坐标系——2000天津城市坐标系。

The previous generation of urban coordinate system was the 1990 Tianjin arbitrary rectangular coordinate system,which has poor accuracy and can no longer meet the needs of urban construction and development of Tianjin,so Tianjin urgently needs to establish a new generation of urban coordinate system.Based on the geographical characteristics of Tianjin city,this paper determined the projection method and the principle of selecting the central meridian in the process of establishing the coordinate system.After trial calculation,the parameters of the coordinate system are finally determined,and the new generation of Tianjin city coordinate system--2000 Tianjin city coordinate system is built.