The rigorous formula of gyroscopic orientation using turning points method is derived by L. S. adjustment in the paper. The comparisons to the Schuler and Thomas average are studied.
本文采用间接平差公式推导了逆转点法定向的严密计算公式，并与舒勒平均值及托马斯平均值作了比较。
This paper introduces the observation, records, calculation and data check of twin turning point method, its advantages, disadvantages, points for attention are discussed.
在困难地区进行支水准路线测量时，可以采用双转点法。
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