Question Paper: Advanced Surveying : Question Paper Dec 2014 - Civil Engineering (Semester 4) | Gujarat Technological University (GTU)

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## Advanced Surveying - Dec 2014

### Civil Engineering (Semester 4)

TOTAL MARKS:

TOTAL TIME: HOURS

**1 (a)** What are the purposes of tacheometic surveying?(3 marks)
**1 (b)** Explain stadia method of tacheometer.(4 marks)
**1 (c)** The following observations were made using a tacheometer fitted with an anallatic lens, the multiplying constant being 100 and additive constant is 0 and the staff held vertically

Inst. Station | Height Of Inst. | Staff Station | WCB | Vertical angle | Hair readings | Remark |

0 | 1.550 | A | 30° 30' | 4° 30' | 1.155, 1.755, 2.355 | RL of O = 150.00 |

B | 75° 30' | 10° 15' | 1.250, 2.000, 2.750 |

Calculate the distance AB and the RLs of A and B. Find also the gradient of the line AB.(7 marks)

**2 (a)**What is triangulation? Explain principle of triangulation.(7 marks)

**2 (b)**Explain with sketches different triangulation figures.(7 marks)

**2 (c)**What is satellite station? Discuss the method of reduction of horizontal angle to Center.(7 marks)

**3 (a)**Define: Direct observation, conditioned quantity, true valve, true error, most probable error, residual error, and observed equation.(7 marks)

**3 (b)**Two triangulation stations A and B are 50 kilometer apart and have elevations 235 m and 250 m respectively. Find the minimum height of signal required at B so that the line of sight may not pass near the ground 3 meters. The intervening ground may be assumed to have uniform elevation of 200 meters.(7 marks)

**3 (c)**What is weight of a quantity? Discuss various laws of weights.(7 marks)

**3 (d)**Adjust the following angles closing the horizon:

A=112° 20' 47'' wt.2

B=90° 30' 15'' wt. 3

C=58° 12' 05'' wt. 1

D= 98° 57'01'' wt. 4(7 marks)

**4 (a)**Define: Zenith, nadir, horizon, prime vertical, celestial poles, vertical circle, and Ecliptic.(7 marks)

**4 (b)**Prove that altitude of pole is equal to latitude of observer.(7 marks)

**4 (c)**Explain the scale of vertical photographs.(7 marks)

**4 (d)**Calculate height of microwave tower appearing in a vertical photograph. The distance of the tower in photograph from principal point is 6.03 cm and relief displacement measured is 0.603 cm. the datum scale of photo is $$\dfrac{1}{11000}$$ and the focal distance of camera f = 20 cm.(7 marks)

**5 (a)**Explain components of remote sensing.(7 marks)

**5 (b)**Explain the interaction of EM energy with earth surface features.(7 marks)

**5 (c)**Define GIS. Explain the objectives of GIS.(7 marks)

**5 (d)**Discuss the application of GIS in civil engineering discipline.(7 marks)