Geodesy
ODC721S
1. Discussthe meaning and implications of Earth Tides, in the context of Geodesy.
(10 marks]
2. Discussthe meaning and major implications of the Vernal Equinox. Use a sketch if necessary.
(6 marks]
3. Explain the difference between a sphere, spheroid, and ellipsoid.
(4 marks]
4. Discussthe difference between a 'sidereal day' and a 'solar day'.
(5 marks]
5. Discussthe classification of coordinate systems used in Geodesy.
(10 marks]
6. Discussthe height system and vertical datum commonly used in Namibia. Briefly mention the
advantages and disadvantages of this system, compared to a more modern vertical datum.
(10 marks]
7. Briefly discuss the RA coordinate System.
(10 marks]
8. Briefly discuss the terms 'Geodetic Latitude', 'Astronomic Latitude,' and 'Deflection of the Vertical'.
Use a sketch if necessary.
(10 marks]
9. Explain how a national geodetic coordinate system is typically defined. How was this done for the
Namibian National Geodetic Datum?
(10 marks]
10. Explain and discuss meridian convergence. Your discussion should include an explanation of true
north, grid north, and geodetic azimuth, as well as a brief discussion of the use of and implications
of meridian convergence in land surveying.
(10 marks]
11. You have recorded the following observations from trig beacon Oaijobe, to unknown Point A, using
a gyro theodolite and EDM:
• Geodetic azimuth: 190°15'23"
• Horizontal distance: 7300.00m (international metre)
Discussand calculate the necessary corrections that must be applied to these observations, in order
to calculate the Lo2217 coordinates of Point A.
Note: You must calculate the final distance and direction that will be used for the polar calculation,
but you do not have to calculate the coordinates of Point A.
(15 marks]
Coordinates: {System: Lo2217}
Trig No. 29 (Daijobe):
Approximate coordinates of Point A:
Y+97 337.90
Y+98 600
X+672 615.20 MSL Elevation: 252.8m
X+679 800
MSL Elevation: 210m
Second Opportunity Question Paper
Page 2 of 3
January 2024