Alidade에 의한 Stadia測高의 正確度 評價 = Evaluation of Accuracy of Stadia Leveling by Alidade

다국어 초록 (Multilingual Abstract)

In order to evaluate the accuracy of Stadia leveling by the Alidade methode, Standard distance and difference of elevation interval were preset. The elevation error was measured by moving target board and basic length. The result are summarized as follows.
Reading error of upper and lower division of target scale for measuring distance is found out 0.157 on average. In case of using prefixed distance, the ratio of elavation error to slight distance ?H/S is about 1/568. This figure showed uniform change in general. However the ratio of elevation error to evaluation ?H/H showed irregularity. In case of not using prefixed distance, ?H/S also showed uniform change. It is also found that accuracy is increasing with basic length becomes longer. i. e. 1/292 at lm, 1/341 at 2m and 1/472 at 3m basic length(However ?H/H also showed irregularity). According to this method, the highest accuracy was obtained when the distance was measured directly and stadia leveling was set to make sight distance small.