Answered: An observer fails to check the bubble,…

An observer fails to check the bubble, and it is off two divisions on a 500-ft sight. What error in elevation difference results with a 10-sec bubble?

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter14: Highway Surveys And Location

Section: Chapter Questions

Problem 12P

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Concept explainers

Errors in surveying

An error in surveying is defined as the difference between two or more values of an identical quantity. However, the estimates are never accurate and there will always be a degree of variability regardless of the research tool or method used. These differences are known as errors that need to be reduced or eliminated to maintain certain levels of accuracy. Even if you carefully follow the prescribed test procedures, the considerations may contain errors.

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An observer fails to check the bubble, and it is off two divisions on a 500-ft sight. What error in elevation difference results with a 10-sec bubble?

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The backsight taken from BM#1 to BM#2 were 1.667 m, 0.579 m, and 2.234 m, the foresight readings were, 2.238 m from TP#1, and 1.936 m from BM#2. If the height of instrument for the first instrument setup is 99.918 m, and the difference in elevation between BM#1 and BM#2 is -0.911m, determine the elevation of TP#2.
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