Computer · Levelling
Which of the following statements correctly defines a Back Sight (B.S.) reading in leveling?
- 1The difference in height calculated between two consecutive staff positions
- 2Any staff reading taken on a point of unknown elevation between a B.S. and an F.S.
- 3The first staff reading taken on a point of known elevation, such as a benchmark✓
- 4The last staff reading taken from an instrument station before changing the position of the instrument
Correct answer
The first staff reading taken on a point of known elevation, such as a benchmark
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