Questions and Answers
What is the primary purpose of reconnaissance in the field work of leveling?
To determine the position of fundamental benchmarks and control the location of level lines.
What is the sequence of activities in the field work of leveling?
Reconnaissance, taking observations, and booking them in the field book.
What is the purpose of determining the position of temporary benchmarks?
To decide the route to be followed and position of the staff station.
What is the final step in the reconnaissance process?
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What is the purpose of booking observations in the field book?
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What is the importance of checking the adjustments of the instrument before starting work?
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What method is used for communication between the instrument man and the surveyor holding the leveling staff in busy and noisy areas?
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What are the two methods of booking and reducing levels of points from observed staff readings?
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What is the purpose of booking observations in the level book?
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What is the significance of ensuring the instrument is in good order before taking observations?
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Study Notes
Field Work in Leveling
- Field work consists of three main stages: reconnaissance, taking observations, and booking them in the field book.
Reconnaissance
- Reconnaissance is the first stage of field work in leveling.
- It involves determining the position of fundamental benchmarks to control the location of level lines.
- The route to be followed is studied in detail to decide the positions of temporary benchmarks.
- The position of the staff station is also decided during reconnaissance.
Pre-Observation Checklist
- A surveyor should check the instrument's adjustments before starting work.
- The instrument should be in good order before proceeding.
Leveling Observations
- Observations are taken on the leveling staff corresponding to the horizontal hair.
- Hand signals are used in busy and noisy areas to communicate between the instrument man and the surveyor holding the staff.
Booking and Reducing Levels
- There are two methods of booking and reducing levels: collimation method and height of instrument method.
- Rise and fall method is also used to book and reduce levels.
- Observations are recorded in a level book.
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