It is inevitable for length projection deformation processing in mine GPS control data transacting.

在矿区GPS控制网数据后处理过程中，对长度投影变形的处理不可回避。

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Therefore, some necessary restricted measures should be taken to make the projection length (deformation) less than 1/40 000 in order to meet the requirement of accuracy for railway surveying.

针对这一问题，必须采取有效的约束条件和措施，使得长度变形小于1/40 000，从而满足铁路测量精度要求。

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