Usually, coordinate values are stored in numeric columns (float, decimal, or even integer), and the specific type will not affect the code presented here.

通常，坐标值存储在数字列中(浮点、小数，甚至是整数)，具体的类型并不影响这里给出的代码。

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The coordinate values are numeric (decimal, float, etc.), not character strings.

坐标值是数字(小数、浮点数等)，不是字符串。

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In the terminology of the Spatial Extender, this is the Spatial Reference system (SRS), a combination of an earth-based coordinate system and a set of numeric conversion parameters.

在Spatial extender术语中，这是Spatial Reference System (SRS)，它组合了基于地球的坐标系和一组数字转换参数。

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