Exercise 16

Ex.16-1 A surveyor standing on seashore can just see the top of a ship through the telescope of a levelling instrument. The height of the line of sight at instrument location is 1.65 meter above msl and the top of ship is 50 meter above sea level. How far is the ship from the surveyor?

The following notes refer to the reciprocal levels taken with one level:

Instrument Station
Staff Readings on

Remarks

 
Near Station
Further station
P
1.03
1.630
Distance PQ = 800 m
Q
2.74
0.950
R.L. of P = 450 m

Find (i) the true R.L. of Q;

  • combined correction for curvature and refraction
  • the error in collimation adjustment of the instrument.

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