The Establishment of 2000 Tianjin Urban Coordinate System Based on CGCS2000
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.
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