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# Differences between height of collimation method and rise and fall method

There are two Methods of Levelling: 1. Height of collimation system 2. Rise and fall system

Differences between height of collimation method and rise and fall method

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

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