GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-IV (OLD) EXAMINATION - WINTER 2018
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Subject Code:140601 Date: 05/12/2018Subject Name: Advanced Surveying
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
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2. Make suitable assumptions wherever necessary.3. Figures to the right indicate full marks.
Q.1 (a) Differentiate between (i) Fixed hair method and movable hair method (ii) Stadia method and tangential method. [07]
(b) A tacheometer was set up at station A and the following readings were obtained on a vertically held staff: [07]
| Station station | Staff station | Vertical angle | Hair readings | Remarks |
|---|---|---|---|---|
| B.M. | -2°18° | 3.225,3.550,3.875 | R.L. of BM. =437.655m | |
| A | B | +8°36’ | 1.650, 2.515, 3.380 |
Calculate the horizontal distance from A to B and the R.L. of B, if the constants of the instrument were 100 and 0.4.
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Q.2 (a) What is triangulation? What are the factors that affect the selection of triangulation stations? [07]
(b) Two triangulation stations A and B are 40km apart and have elevations of 178m and 175m respectively. Find he minimum height of signal required at B so that the line of sight may not pass nearer the ground than 3 meters. The intervening ground may be assumed to have a uniform elevations of 150meters. [07]
OR
(b) Explain the basic principle of EDM. Write a brief note on Electromagnetic spectrum. [07]
Q.3 (a) Explain the theory of least squares. [07]
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(b) Following readings of levelscwere carried out 2.337, 2.347, 2.353, 2.301, 2.317, 2.307, 2.327 and 2.316. Calculate (i) Probable error for signal observation (ii) Probable error for mean: [07]
OR
Q.3 (a) What is field astronomy? Explain objectives of field astronomy. [07]
(b) What is vertical photograph? Derive an expression for the scale of a vertical photograph. How would you determine the scale of a given vertical photograph? [07]
Q.4 (a) What are the objectives of GIS? Discuss the key components of GIS. [07]
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(b) The scale of an aerial photograph is 1cm=100m. The photograph size is 20cm x20cm. Determine the number of photographs required to cover an area of 100 sq.km if the longitudinal lap is 60% and side lap is 30%. [07]
OR
Q.4 (a) Define remote sensing. Explain component of remote sensing. [07]
(b) Determine the azimuth and altitude of a star from the following data. [07]
Latitude of the observer = 46° N
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Hour angle of star = 42°Declination of star = 16°20° N
Q.5 (a) What do you mean by GPS. Discuss uses and applications of GPS. [07]
(b) Write a short note on total station. [07]
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OR
Q.5 (a) What are the applications of GIS in civil engineering? [07]
(b) Explain the interaction of EM energy with the earth features? [07]
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