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本文用极大似然法和大坝观测的视准线法推导了基本的定权公式。用这两种方法推导的结果与测量平差书上按最小二乘法推导的结果是一致的。但在大坝视准线法不等精度观测中,由该基本定权公式推导的实用定权公式与测量平差书上的实用定权公式不一致。在大坝视准线法不等精度观测中只能按大坝视准线法观测的实用定权公式来定权,不能按测量平差书上的实用定权公式来定权。
In this paper, we derive the basic weight formula by the maximum likelihood method and the sight line method of dam observation. The results deduced by these two methods are consistent with the results of the least square method on the book for the adjustment of tolerance. However, in the observation of unequal accuracy of the dam sight line method, the formula of practical weight formula derived from the basic formula of fixed weight is inconsistent with the formula of practical right of weight in the book of adjustment allowance. In the dam sight line method ranging accuracy observation can only be based on the dam sight line method of observing the practical formula to determine the weight of authority, can not be adjusted according to the book of practical formula to determine the right to weight.