There are multiple ways to define a coordinatesystem for Earth coordinates; some are better for particular purposes than others.
有多种方式来定义地面坐标系统；有一些在某些用途方面比其他的更好。
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The J reveals that a coordinatesystem known as J2000 is being used, while the 1302 and 6350 are coordinates similar to the latitude and longitude codes used on Earth.
In the terminology of the Spatial Extender, this is the Spatial Reference system (SRS), a combination of an earth-based coordinatesystem 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。