20. Primary objective
• to plan for feasible location of prominent structures
such as intake, dam, canal, fore bay, penstock pipe,
power house and tail race.
• Secondary objective
To prepare the topographic map of site containing
head works to tailrace
To plot the cross-section and L-section of the canal.
To determine the power generation capacity of the
hydro project
To prepare the cross section and L- section of the river
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objectives
2023 December 2015
21. Sardi Khola VDC, ward No. 7 of Kaski district.
The site is shown in rectangle filled with red
color is shown in figure below. Hy
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Study area
2123 December 2015
22. • Total Station (Topcon230N)
• Prism (Reflector+ stand)
• Measuring tape /steel tape
• Tripod stands
ArcGIS 10.1
Microsoft office 2013
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Instrument used
22
software used
23 December 2015
24. Topographic map of hydro power survey siteresults
24
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23 December 2015
25. CONCLUSION
• Through this project we got the knowledge about the
hydropower survey ,providing the feasible site location of
hydropower component
• The head difference was of 24.89m which produced the energy of
529.304KW.
23 December 2015 25
27. INTRODUCTION
• Satellite-based radio-navigation system that is capable of
providing extremely accurate worldwide, 24-hour, 3-
dimensional location data
• The system was designed and is maintained by the US
Department of Defense (DoD) as an accurate, all-weather
navigation system, in 1970s
• Though designed as a military system, it is available with
certain restrictions to civilians
27
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28. The Working Principle of GPS
• Position of a unknown object can be identified by measuring
range/distance of the object from at least three known
position, a well-known principle of trilateration in traditional
surveying
• The distance from satellite to earth is calculated by using
the relationship of velocity of light signal and time taken to
reach the earth
• In GPS, at least three (actually, 4) known positions of
satellite are used to identify the unknown position on (or
above) the earth surface
28
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29. Components: Space Segment
• Consist of 24 operational and 5 backup satellites
• 6 orbital planes at inclination 55° and 60° apart
• Satellite altitude about 20,200 km
• Orbital period 12 hrs
• Each GPS satellite transmits a signal, which has a number of
components:
two sine waves (also known as carrier frequencies):
L1(1575.42 MHz) and L2 (1227.60 MHz)
two digital codes and a navigation message:
• Main functions of Space segment
Receive and store data from control segment
Maintain a very precise time
Transmits coded signals to user receivers through two carrier
frequencies 29
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30. Components: Control Segment
Consists of
Master control station (1 functional+ 1 backup) at Colarado
Springs, three uploading stations, six monitor stations and
ten national geodetic stations
Functions
Monitor the satellites
Estimate the on-board clock state and define the
corresponding parameters to be broadcast
Define the orbits of each satellites in order to predict the
ephemeris and almanac
Determine the altitude and locations of satellites in order to
determine the parameters to be sent to the satellites for
correcting their orbits
30
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31. Components: User Segment
• The user segment includes all military and civilian users
• With a GPS receiver connected to a GPS antenna, a user
can receive the GPS signals, which can be used to
determine his or her position anywhere in the world
• GPS is currently available to all users worldwide at no
direct charge
31
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32. Limitations of GPS Surveying
Atmospheric Errors: Ionosphere and troposphere delays
Signal multipath errors
Satellite clock errors
Receiver clock errors
Orbital/ephemeris errors
Number of satellite visible
Dilution of precision(DoP): VDoP, HDoP, GDoP, and PDOP
Selective availability and anti-spoofing
23 December 2015 32
GP
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33. Positioning Methods
• Commonly two type of positioning methods
Absolute or point positioning :
uses the single receiver, most basic and common, less accurate
and fast technique, also called standalone/absolute/autonomous
positioning
Differential or relative positioning:
uses at least two receivers (base/stationary/reference receiver
and rover/ roving receiver), attain higher accuracy than point
positioning,
33
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34. OBJECTIVES
• The main objectives of this project is to prepare the
map showing all the government offices in Pokhara
municipality.
• The other objectives are as follows;
To know about handling handheld GPS device
To use GPS as the technique of data collection for
GIS
34
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35. STUDY AREA
35
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Geographic location: 28-50-50 N, 83-58-20 E
Area: 55.222 square KM
Highest elevation: 1740 m
Lowest elevation :827 m
38. CONCLUSION AND RECOMMENDATION
38
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GPS survey is most useful and for regional scale it is
best suited for thematic mapping in the present
context of surveying
In this camp, all government offices are not known to
us and hence all offices are not mapped in this map
39. Bibliography
39
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23 December 2015
Langley, R. B., .The GPS Receiver: An Introduction to GPS World, Vol. 2, No.
1, January 1991, pp. 50-53.
Ahmed El-Rabbany, Introduction to GPS: The Global Positioning System, 1-
10.
Satellite Geodesy, Walter de Gruyter Berlin, New York 2003, 211-240.
Anderle, R. (1979): Geodetic applications of the NAVSTAR Global Positioning
System.
Central Bureau of Statistics. (2015, Nov 30). Retrieved from
http://www.cbs.gov.np/
National Journal of Geoinformatics. (May-June, 2006). Survey Department of
Nepal.
Arbind Man Tuladhar, "Parcel-based Geo-Information System: Concepts and
Guidelines", ITC Dissertation Series No. 115: Netherland, (2004).
Babu Ram Acharya (June 2008). Land Tenure and Land Registration in Nepal,
Sweden.
Land Administration Guidelines (1996), United Nations Publications: New
York.
Basidev Bhatta, 2011, Remote Sensing and GIS, Oxford University Press, New
Delhi, 188-223