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In levelling, which of the following is an advantage of the rise and fall method over the height of instrument method?
1. It is relatively rapid
2. No backsight is required at change points
3. Check on the calculations for intermediate sights are done
4. No benchmark is required to calculate the Reduced level of each point

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Correct Answer - Option 3 : Check on the calculations for intermediate sights are done

Explanation:

Rise and Fall Method:

  • It is adopted whenever the number of intermediate stations is less and also if the number of shifting of instruments is more
  • The difference between the levels of consecutive staff points is calculated
  • The rise and fall method for obtaining the reduced levels of points provides a check on foresight, backlight & intermediate sight.
  • Generally used for fly leveling, profile leveling or to establish BMs
  • ∑BS - ∑FS = Last R.L – First R.L = ∑Rise - ∑Fall

 

Collimation Method or Height of instrument method:

  • This method is generally adopted if there are lot many numbers of intermediate stations and also if the number of shifting of instruments is less
  • It does not provide a check on Intermediate sights
  • Height of instrument is calculated at each set up of the instruments
  • Generally used in contour survey, in small areas
  • Checks: ∑BS - ∑FS = Last R.L – First R.L

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