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本文介绍一种在三角高程测量中,不能准确知道大气折光系数的情况下,对往返测高差不符值实施有效控制的方法——极差判断法。并举例说明如何运用极差限值对观测成果进行极差判断。
In this paper, we introduce a method of judging the discrepancy of round trip height difference by means of range judgment when the refraction coefficient of atmosphere can not be accurately known in trigonometric leveling. An example is given to illustrate how to use the range limit to make bad judgment on the observed results.