摘要
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。
A basic formula for deciding weight by the maximum quasi probable methodand the collimation line method for great dam observation is derived in this artical. The result obtained from these two method corresponds with that from the least squares method in the books of survey adjustment. But the practical formula for deciding weight derived from this basic formula is different from tha written in the books of survey adjustment. Our study proves that, for the great dam observvation in unequal accuracy, only the practical formula derived from the callimation method can be used for deciding weight, while that written in the books of survey adjustment can not.
