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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An maximum likelihood registration algorithm based on earth-centered earth-fixed (ECEF) coordinate system is presented.

提出了一种基于地心坐标系（ECEF）的传感器极大似然配准算法。

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