Lecture Theodolite Random Errors

Lecture Theodolite Random Errors - Lecture Theodolite...

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Lecture Theodolite Random Errors Lecture Notes Text Coverage: Ch 3:17 Prob 3-22, 3-23 Ch 8:7 Prob: 8:31 Theodolite random error sources : When an angle is measured, random errors (close enough judgment, instrument, environment) happen in the following order: Ec" – centering the instrument tribrach over the angle vertex. (close enough) Epc" – prism centering by the rod's bullseye bubble on the backsignt point causing this angle uncertainty Ep" – pointing on backsight set zeroes – no instrument reading error Epc" -- prism centering by the rod's bullseye bubble on the foresight Ep" – pointing on foresight Er" – reading randomness of theodolite's digital circle. Pointing – the ability of the observer to bring the cross hair back to the same point within a small tolerance. This also depends on (1) size and shape of the target (minimize this effect by choosing targets that are just slightly wider than the cross hair), and (2) random atmospheric refraction heat waves (minimize this by observing in a building or at night). Reading – the randomness in the theodolite’s reading system (either manual or
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This note was uploaded on 05/19/2011 for the course GEM 3330 taught by Professor Gibson during the Spring '11 term at University of Florida.

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Lecture Theodolite Random Errors - Lecture Theodolite...

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