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Which is following method for find out vertical angle ?
General
Repetition
Reiteration
None of the above
None of the above
Vertical angles in surveying are measured using the vertical circle of a theodolite, typically by sighting an object and reading the vernier or digital display. Unlike horizontal angles, which can be measured using repetition or reiteration methods to improve precision, vertical angles are single-observation measurements relative to the horizontal plane or zenith.
Vertical angles in surveying are measured using the vertical circle of a theodolite, typically by sighting an object and reading the vernier or digital display. Unlike horizontal angles, which can be measured using repetition or reiteration methods to improve precision, vertical angles are single-observation measurements relative to the horizontal plane or zenith.
α=Readingtarget−Readinghorizon — definition of vertical angle relative to the horizontal plane.
The measurement of a vertical angle is based on the vertical circle being rigidly attached to the telescope. When the telescope is tilted, the circle rotates with it, and the angle of inclination is measured by index arms or automatic vertical circle compensators relative to the gravity-defined horizontal or vertical line.
Repetition and Reiteration are exclusively methods for measuring horizontal angles.
Vertical angles are measured using the vertical circle of the theodolite.
The vertical index frame must be leveled precisely to ensure accurate vertical angle readings.
Correction for index error is often required in vertical angle measurements.
Quick determination of elevation difference.
Essential for trigonometric leveling.
Cannot be measured using repetition for error reduction.
Highly sensitive to level of the instrument.
Height calculation of distant objects.
Trigonometric leveling.
Tacheometric surveying.
Repetition method is used for increasing precision of horizontal angles by repeating the measurement multiple times.
Reiteration method is used to measure multiple horizontal angles from a single station.
Vertical angles are limited to a single measurement per sight as the telescope cannot be rotated around the horizontal axis while maintaining the target orientation.
D is correct — None of the listed options (General, Repetition, Reiteration) are methods used to measure vertical angles in surveying.
Always distinguish between horizontal angle methods (Repetition/Reiteration) and vertical angle measurements, which do not permit these specific accumulation techniques.