Civil Engineering ► Surveying & Levelling ► Error Sources in Digital Surveying & Leveling
Errors in Levelling |
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1. Instrumental error and Correction
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2. Error of Collimation:Collimation error occurs when the collimation axis is not truly horizontal when the instrument is level. The effect is illustrated in the sketch below, where the collimation axis is tilted with respect to the horizontal by an angle a: 3. Curvature & RefractionFor detailed explanation Click here... Other sources of errors in levelling and their correction:
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