Which operation is normally performed first when setting up a theodolite over a survey station?
Correct answer: A. Centering the instrument
- A. Centering the instrument
- B. Focusing the objective lens
- C. Measuring the vertical angle
- D. Reading the horizontal circle
Explanation
The instrument is first centered approximately over the station so that subsequent levelling is performed at the correct position. Focusing and angle observations are carried out after the instrument is properly set up.
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About Surveying
Surveying covers measurement of distances, angles and elevations, traversing, levelling, contouring, plane table work, theodolites, total stations and basic photogrammetry. It includes error adjustment, coordinate calculations, area and volume determination, and the distinction between accuracy and precision, as well as between temporary and permanent adjustments.
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