Question:
To determine the elevation difference between two points far apart (e.g., across a river) and is impossible to set up the instrument in between, {
To determine the elevation difference between two points far apart (e.g., across a river) and is impossible to set up the instrument in between, {
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"Reciprocal" means "back and forth"—you level from both sides to cancel out the errors caused by the long distance.
Updated On: May 5, 2026
- Reciprocal leveling
- Longitudinal leveling
- Fly leveling
- Differential leveling
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The Correct Option is A
Solution and Explanation
Step 1: Concept Standard leveling assumes the instrument can be placed midway between points to cancel out atmospheric refraction and earth curvature errors.
Step 2: Meaning Obstacles like wide rivers prevent this balanced setup.
Step 3: Analysis Reciprocal leveling involves taking two sets of staff readings. First, the instrument is set near the first point, and readings are taken on both points. Then, it is moved near the second point, and the process is repeated. Averaging these differences eliminates the systematic errors.
Step 4: Conclusion Reciprocal leveling is the technique designed for this specific constraint.
Final Answer: (A)
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