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MARA UNIVERSITY OF TECHNOLOGY Jack Ruzaini BACHELOR OF GEOMATIC AND SURVEYING SCIENCE (AP220) ([email protected]) SUG514 – HYDROGRAPHIC SURVEYING Run Line vs Cross Line _________________________________________________________________________________________________________
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QUESTION
Survey Area is 2 km to seaward and 5 km along the coast. The final scale is 1 : 2000
Calculate:
1. The total number of sounding line
2. The total sounding distance
3. The total number of cross line if the cross line spacing is 5 times of sounding line
spacing
4. The total distance of cross line
5. If the turning distance between lines is 15% of the total run line distance and the
survey speed is 5 knots, how many hours are required for sounding?
1. Number of Sounding Line
= 5000 m coastal ÷ 20 m sounding line
spacing
= 250 lines + 1 lines begin
= 251 lines
2. Total Sounding Distance
= 2 km seaward x 251 sounding lines
= 502 km
3. Number of Cross Lines
= 5 times sounding line spacing
= 5 x 20 m
= 100
= Length of sounding distance (seaward), 2 km = 2000 m
= (2000 m ÷ 100 m) + 1 lines
= 21 lines
MARA UNIVERSITY OF TECHNOLOGY Jack Ruzaini BACHELOR OF GEOMATIC AND SURVEYING SCIENCE (AP220) ([email protected]) SUG514 – HYDROGRAPHIC SURVEYING Run Line vs Cross Line _________________________________________________________________________________________________________
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4. Total Cross Line Distance
= Total Sounding Distance + Total Number of Cross Line
= 502 km + 105 km
= 607 km
5. If the turning distance between lines is 15% of the total run line distance and the
survey speed is 5 knots, how many hours are required for sounding?
15% of the total sounding line distance
= (15 ÷ 100) x total cross line distance
= (15 ÷ 100) x 607 km
= 698 km
1 knot = 1.852 km / h
= 5 knots
= 5 x 1.852
= 9.26 km / h
How many hours required?
= 698 ÷ 9.26
= 76 hours
