高精度GPS测量所依据的坐标参考基准，是由IERS所提供的ITRF国际地球参考框架。
The coordinate reference datum on which precision GPS survey is based, is ITRF International Terrestrial reference Frame that IERS offers.
所有测量数据，包括参考测量基准点的名字应按核准的坐标数字形式正式的提供给工程师。
All survey data, including the names of the reference survey Benchmarks shall be officially provided to the Engineer in an approved co-ordinated digital form.
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