Enrolment No.
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Subject Code: 2140601
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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- IV (New) EXAMINATION - WINTER 2019
Subject Name: Advanced Surveying
Time: 10:30 AM TO 01:00 PM
Instructions:
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- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
Q.1 (a) Explain principle of tachometry. 03
(b) What do you mean by strength of figure in triangulation work? 04
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(c) Describe various applications of remote sensing in field civil engineering. 07
Q.2 (a) What is an analytical lens? In which telescope it is used? 03
(b) Differentiate between fixed hair method and movable hair method of techeometry. 04
(c) To determine elevation of station Q in tacheometry survey the following observations were made with the staff held vertically. 07
Inst H.I Staff | Vertical . Remarks
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Station (m) | station | Angle Staff Readings (m)P 1.45 BM | -06°00" | 1.335 | 1.895 | 2.460 | R.L.of
P 1.45 CP | +08°30'|0.780 | 1.265 | 1.745 | B.Mis
Q 1.40 CP | -06°30" | 1.155 | 1.615 | 2.075 | 50.00 m
C.P. is the change point.
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The instrument was fitted with analytical lens having multiplying constant 100 and additive constant 0, find R.L. of station Q.
OR
(c) Derive the expression for horizontal and vertical distances by the fixed hair method when the staff is held-vertically & the measured angle is that of elevation
Q.3 (a) Define the term probable value and probable error. 03
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(b) Discuss the rules to be applied for the distribution of errors to the field observations. 04
(c) Two stations A and B at 95 km apart have elevation of 190 m and 980 m, respectively. If the elevation of peak P at distance 37 KM from A is 280 m, show that Station A and B are inter visible. Use any method. 07
OR
Q.3 (a) What is meant by a satellite station? Why it is required? 03
(b) Describe the different aspect of field work in triangulation 04
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(c) Find the probable values of X, Y and Z given that 07
X=46°12'34",
Y=22°18'36",and
Z=X+Y=68°31'13"
Q.4 (a) Define Azimuth, altitude and Celestial sphere. 03
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(b) How terrestrial latitudes and longitudes are determined. 04
(c) Find the azimuth and altitude of star from following data. 07
Latitude of observer = 48° N
Hour angle of the star = 43°
Declination of star = 18°20° N
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Date: 13/12/2019
Total Marks: 70
Q.4 (a) Discuss longitudinal overlap and side overlap in aerial photography. 03
(b) Explain scale of vertical photograph. 04
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(c) Two points P and Q have elevations of 600 m and 300m respectively. The photograph was taken with a camera having focal length of 210 mm and from an altitude of 2500 m. The corrected photo coordinates of p and q are as: 07
Point Photo Co-ordinates
om x(mm) Y (mm)
p 35 25
q 20 50
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Find length of line PQ on ground.
Q.5 (a) Explain basic Principle of EDM. 03
(b) What is GIS? Discuss component of GIS. 04
(c) What do you mean by image interpretation? Explain various elements of visual image interpretation. 07
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OR
Q.5 (a) Discuss active remote sensing and passive remote sensing. 03
(b) Explain electromagnetic energy interaction with features on the earth surface. 04
(c) What is total station? Describe uses of total station in field of civil engineering. 07
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