Survey Data
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Level Survey Reducing Levels
Level Survey terminology
(first) (many) (last)
Backsight Intermediate Foresight
Level Survey reading the staff
Each square interval = 10mm Each 'E' = 50mm
Level Survey
taking & recording sights
Position Tripod Located for clear views
Place Staff A clearly defined point with a preferably known level.
(temporary) Benchmark A.H.D. Australian height datum
Level Survey
taking & recording sights
1
st
Backsight
Staff Reading + known (given) level = B.S.
H.P.C
Level Survey
taking & recording sights
Intermediate Independent INT.
Level Survey
taking & recording sights
Foresight Last sighting made before relocating tripod F.S.
Level Survey
taking & recording sights
HPC Value changes only after tripod relocated H.P.C
Level Survey
taking & recording sights
Reduced Level 1st RL pre-determined. Subsequent values calculated by R.L. subtracting from HPC
Level Survey
taking & recording sights
Description Remember: Concise & accurate.
Description
Level Survey
taking & recording sights
Example
A temporary benchmark of 100.000 AHD is set [BS] Staff reading is 1.575m [HPC] = 100.000 + 1.575 = 101.575 BS 1.575
INT
FS
HPC
RL
Des.
101.575 100.000 Start TBM nail in footpath.
Level Survey
taking & recording sights
Example
A number of intermediate points are taken. [INT] 1.700 [INT] 1.300 BS
INT
1.575 1.700 1.300
FS
HPC
RL
Des.
101.575 100.000 Start TBM nail in footpath. Southwest corner of wall 101.575 99.875 101.575 100.275 Southeast corner of wall
This is showing a fall across the south elevation of the building of 400mm
Level Survey
taking & recording sights
Example
When closing the survey or prior to relocating the tripod a foresight is made BS 1.575
INT
FS
HPC
101.575 1.700 101.575 1.300 101.575 1.275 101.575
RL 100.000 99.875 100.275 100.300
Des. Start TBM nail in footpath. Southwest corner of wall Southeast corner of wall Legal point of discharge
Level Survey
taking & recording sights
Example
Calculating a new HPC HPC – [FS]-[BS] = new HPC 54.240- (5.260-3.640) = 52.620 1.620
Level Survey terminology
(first) (many) (last)
Backsight Intermediate Foresight
Level Survey reading the staff
Each square interval = 10mm Each 'E' = 50mm
Level Survey
taking & recording sights
Position Tripod Located for clear views
Place Staff A clearly defined point with a preferably known level.
(temporary) Benchmark A.H.D. Australian height datum
Level Survey
taking & recording sights
1
st
Backsight
Staff Reading + known (given) level = B.S.
H.P.C
Level Survey
taking & recording sights
Intermediate Independent INT.
Level Survey
taking & recording sights
Foresight Last sighting made before relocating tripod F.S.
Level Survey
taking & recording sights
HPC Value changes only after tripod relocated H.P.C
Level Survey
taking & recording sights
Reduced Level 1st RL pre-determined. Subsequent values calculated by R.L. subtracting from HPC
Level Survey
taking & recording sights
Description Remember: Concise & accurate.
Description
Level Survey
taking & recording sights
Example
A temporary benchmark of 100.000 AHD is set [BS] Staff reading is 1.575m [HPC] = 100.000 + 1.575 = 101.575 BS 1.575
INT
FS
HPC
RL
Des.
101.575 100.000 Start TBM nail in footpath.
Level Survey
taking & recording sights
Example
A number of intermediate points are taken. [INT] 1.700 [INT] 1.300 BS
INT
1.575 1.700 1.300
FS
HPC
RL
Des.
101.575 100.000 Start TBM nail in footpath. Southwest corner of wall 101.575 99.875 101.575 100.275 Southeast corner of wall
This is showing a fall across the south elevation of the building of 400mm
Level Survey
taking & recording sights
Example
When closing the survey or prior to relocating the tripod a foresight is made BS 1.575
INT
FS
HPC
101.575 1.700 101.575 1.300 101.575 1.275 101.575
RL 100.000 99.875 100.275 100.300
Des. Start TBM nail in footpath. Southwest corner of wall Southeast corner of wall Legal point of discharge
Level Survey
taking & recording sights
Example
Calculating a new HPC HPC – [FS]-[BS] = new HPC 54.240- (5.260-3.640) = 52.620 1.620
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