Often, it is something global like WGS-84 (World Geodetic System 1984, used by all GPS devices), or a regional datum like NAD-83 (North American Datum 1983).
它常常是全球大地基准点(比如WGS-84,即World Geodetic System 1984,由所有GPS设备使用),或地区性大地基准点(比如NAD-83,即NorthAmericanDatum 1983)。
Often, it is something global like WGS-84 (World Geodetic System 1984, used by all GPS devices), or a regional datum like NAD-83 (North American Datum 1983).
它常常是全球大地基准点(比如WGS-84,即World Geodetic System 1984,由所有GPS设备使用),或地区性大地基准点(比如NAD-83,即NorthAmericanDatum 1983)。
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