Moreover, the local coordinate systems in the cities of our country lack in direct and precise connection to the geocentric coordinate system and the national coordinate system.

此外，目前许多城市的地方坐标系统与国家坐标系统之间缺乏精确严格的换算关系。

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Note that SRS names and IDs are arbitrary and local to each database, but the underlying coordinate systems are often predefined, with reference to industry authorities.

注意，SRS 名称和 ID 是任意的，而且是每个数据库本地的，但是底层的坐标系常常是根据行业特权而预定义的。

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