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Which of the following are type of total station for horizontal angle measured manually?
Manual total station
Semi-automatic
Automatic total station
Both A and B
Both A and B
Total stations are classified based on the degree of automation in target sighting and angle measurement. Manual and semi-automatic total stations require the user to manually align the telescope with the target point to record horizontal angles, whereas automatic total stations use motorized servos and auto-tracking technology to lock onto prisms.
Total stations are classified based on the degree of automation in target sighting and angle measurement. Manual and semi-automatic total stations require the user to manually align the telescope with the target point to record horizontal angles, whereas automatic total stations use motorized servos and auto-tracking technology to lock onto prisms.
╬▒=arctan(xyтАЛ) тАФ Basic horizontal angle calculation where x and y are coordinate components.
In manual and semi-automatic instruments, the horizontal circle reading is triggered by the operator after optical or electronic alignment. The electronic distance measurement (EDM) is integrated, but the physical orientation of the instrument head remains a human-controlled task during the angle measurement phase.
Manual total stations require the operator to perform all sightings and focusing manually.
Semi-automatic models may have electronic angle reading, but often require manual target alignment.
Automatic total stations (Robotic) utilize an Auto-Target Recognition (ATR) system to eliminate manual sighting.
Horizontal angle precision is heavily dependent on the quality of the optical plummet and the circle reading system.
Manual stations are highly cost-effective for standard survey tasks.
Reduced reliance on battery power for motorized components.
Manual sighting is prone to human error and fatigue.
Efficiency is significantly lower than robotic/automatic systems.
Topographic surveying in small to medium areas.
Cadastral mapping and construction layout.
Control surveys where high precision is required.
An automatic total station is often called a 'Robotic Total Station'.
Option C (Automatic) is incorrect as it does not rely on manual angle measurement procedures; it uses motorized drives for tracking.
D is correct тАФ Both manual and semi-automatic total stations involve manual intervention for the alignment and measurement of horizontal angles.
Always distinguish between 'data recording' (which is automatic in all total stations) and 'target sighting' (which differentiates manual from robotic systems).