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During the alignment of a road by using direct ranging, the surveyor raises both the hands above his head and then, brings them down as a signal for his assistant. The correct action taken by his assistant would be __________.
moving the ranging rod forward along the same line
Lift the ranging rod above the knee level
considering that the ranging rod is at correct position
moving the ranging rod backward along the same line
considering that the ranging rod is at correct position
In surveying, direct ranging requires communication between the surveyor and the assistant via standardized hand signals to align ranging rods in a straight line. Raising both arms above the head and bringing them down is the conventional signal indicating that the ranging rod is correctly aligned with the terminal stations.
In surveying, direct ranging requires communication between the surveyor and the assistant via standardized hand signals to align ranging rods in a straight line. Raising both arms above the head and bringing them down is the conventional signal indicating that the ranging rod is correctly aligned with the terminal stations.
E=Error=Lateral┬аDisplacement
╬Ф╬╕тЙИLEтАЛ тАФ where L is the distance from the observer to the rod
Ranging involves establishing intermediate points along a straight survey line between two well-defined points. The surveyor at one end directs the assistant, who holds the ranging rod at the intermediate point, to move left or right until it coincides with the line of sight. Once the vertical alignment is confirmed, the surveyor gives the 'correct' signal.
Right arm extended: Move the rod to the right.
Left arm extended: Move the rod to the left.
Rapidly waving the arm: The rod is far from the true line.
Both arms above head and brought down: Rod is in the correct position.
Ensures accuracy in linear measurement.
Eliminates observational errors in long survey lines.
Dependent on clear visibility and line of sight.
Requires high coordination between the surveyor and the assistant.
Establishing intermediate points in chain surveying.
Setting out road alignments and boundaries.
Direct ranging is used when the terminal points are intervisible.
Option A and D represent signals for lateral movement, not the confirmation of the final position.
Option B is not a standard signal; signals are primarily based on horizontal arm movements.
C is correct тАФ raising both arms above the head and bringing them down is the standardized signal in surveying to indicate the ranging rod is on the correct line.
Memorize the standard ranging signals as they are frequently tested in engineering entrance exams (like GATE or state PSCs); specifically distinguish between lateral correction signals and the confirmation signal.
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