{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Lecture Theodolite Random Errors

Lecture Theodolite Random Errors - Lecture Theodolite...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
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).
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}