Differences between height of collimation method and rise and fall
There are two Methods of Levelling:
1. Height of collimation system
2. Rise and fall system
Height of collimation system Vs Rise and fall system
1 It is rapid as it involves few Calculation
It is laborious involving several calcuation
2 There is no check on the RL of the intermediate sight
There is a check on the RL of the intermediate points
3 Errors in the intermediate RLs cannot be detected.
Errors in the intermediate RLs can be detected as all the points are correlated
4 There are two checks on the accuracy of RL calculation
There are three checks on the accuracy of RL calculation
5 This system is suitable for longitudinal leveling where number of intermediate sights
This system is suitable for fly there are a leveling where there are no intermediate sights
Height of collimation system
1 It is rapid as it involves few Calculation
2 There is no check on the RL of the intermediate sight
3 Errors in the intermediate RLs cannot be detected.
4 There are two checks on the accuracy of RL calculation
5 This system is suitable for longitudinal leveling where number of intermediate sights
Rise and fall system
It is laborious involving several calcuation
There is a check on the RL of the intermediate points
Errors in the intermediate RLs can be detected as all the points are correlated
There are three checks on the accuracy of RL calculation
This system is suitable for fly there are a leveling where there are no intermediate sights