Compare collimation plane method and rise and fall method of reduction of levels.
The comparison between collimation plane method and Rise and fall method is given below.
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Collimation plane method
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Rise and Fall method
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1 |
1. It is rapid method as it involves few calculations.
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It is laborious involving several calculations.
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2 |
There is no check on the correctness of R.L. of intermediate points, hence mistake remain unchecked
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There is a check on correctness of intermediate points
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3 |
The error in calculating the R.L. of any point is not carried forward as the RLs are calculated from respective plane of collimation.
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The mistakes made in calculation of RLs of any point are carried forward in this method.
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4 |
It is used for calculating the RLs of profile leveling operations, where there are more number of intermediate points.
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This method is more suitable when the intermediate points are less. This method is also used when calculating RLs of precise leveling work, check leveling etc.
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5 |
Arithmetic check in this method is ΣBS – ΣFS = Last RL – First RL
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Arithmetic check in this method is ΣBS – ΣFS = ΣRise – ΣFall = Last RL – First RL
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