Aiming at the problem of inaccurate definition of positioning reference ,a standard definition of locating datum is given. The accuracy of the formulation is verified by calculating several examples. The differences and relations between general definition and standard definition are discussed.%针对目前定位基准概念不准确的问题,给出了定位基准的标准定义,通过几道例题的解算验证了该提法的准确性,探讨了其与定位基准一般定义之间的区别与联系.
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