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ODC721S - GEODESY - 2ND OPP - DEC 2025 |
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nAmlBIA unlVERSITY
OF SCIEnCE Ano TECHnOLOGY
FACULTY OF ENGINEERING AND THE BUILT ENVIRONMENT
DEPARTMENT OF LAND AND SPATIAL SCIENCES
QUALIFICATIONS:
BACHELOR OF GEOMATICS
QUALIFICATIONS CODES:
07BGEO
COURSE CODE: ODC721S
DATE: December 2025
DURATION: 3 HOURS
QUALIFICATION LEVEL:
Level 7 - 07BGEO
COURSE NAME: Geodesy
PAPER: THEORY
MARKS: 100
SECOND OPPORTUNITY/SUPPLEMENTARY EXAMINATION QUESTION PAPER
EXAMINER:
Dr J. Odumosu
MODERATOR:
Dr K. Owolabi
INSTRUCTIONS
1. Answer all questions.
2. Write clearly and neatly.
3. Marks will be deducted for poor writing, spelling and grammatical errors.
4. Number the answers clearly.
5. Make sure you r Student Number is on the EXAMINATION BOOK{s).
THIS QUESTION PAPER CONSISTS OF 3 PAGES {Including this front page)
PERMISSIBLE MATERIAL
Calculator
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Geodesy
ODC721S
QUESTION 1
Given the following gravity observations taken with a Scrintrex CG5 gravimeter, compute the
following at each station:
1.1 Drift.
1.2 Latitude.
1.3 Free-air Corrections.
Consequently, determine the final absolute gravity valu e for each station.
{20)
Tab le 1: Gravity field notes
Sta.=ID- - Lat- ~ Long- - Height- - Dial
(<p)
(..l)
(m)
Reading
YTl/24 6.5085 3.3751 28.20 1580.8086
GPOl 6.5143 3.3769 30.7
1581.7569
GP02 6.5251 3.3684 18.1
1582.9931
GP03 6.5298 3.3683 18.8
1582.2448
GP04 6.5251 3.3681 19.2
1582.3104
GP05 6.5185 3.3169 30.65 1581.6923
YTl/24 6.5085 3.3751 28.20 1580.8617
+imeof- - - -Absolute -
Observation
Gravity (mgals)
3/25/2017- 09:06
978119.857
3/25/2017- 09:23
3/25/2017- 09:29
3/25/2017- 09:37
3/25/2017- 09:52
3/25/2017- 10:04
3/25/2017- 10:35
Hints:
FAcorr = 0.3086h mgals
Latcorr = 0.000812 X sin(2<p) mgals/m
[20]
QUESTION 2
For an ellipse, show that:
2.1
2.2
= a 2 (1- e2 ) sin <P
Z
[1- e2 sinZcJ>] 1lz
{5)
{15)
[20]
Second Opportunity/Supplementary Question Paper Page 2
December 2025
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Geodesy
ODC721S
QUESTION 3
The following data were observed during astronomical observations to determine the azimuth
of a line: Calculate the azimuth of the line.
(20)
Observation sched ule:
Lat = 45° 52' 15"5
Long= 11hr 22m 3.9s
Plate bubble = 20" per division
Face - ObJecCffiCR
VCR
Alt1tucle
L
RM
348 11 10
L
Sun
151 07 30 059 45 37
R
Sun
35110 40 300 09 12
R
RM
168 11 11
Take declination of the Sun as 11° 15' 48"5
~Plate ou66.e App [ stcl , - -
2.7 2.0
4.4 0.3
9hrs 00m
9hrs 03m
[20]
QUESTION 4
4.1 Using relevant diagrams (where necessary), write an explanatory note on the concept of
sidereal time.
(10)
4.2 Using appropriate geodetic notations and illustrations, to differentiate between gravity
anomaly and gravity disturbance.
(10)
[20]
QUESTION 5
In you r own words, discuss extensively on the Namibian Terrestrial Reference Frame. In your
discussion, identify the choice of ellipsoid and reasons for it, and the reference frame itself
(configuration, realization, observational methods, and recent adaptations).
(20)
[20]
Second Opportunity/Supplementary Question Paper Page 3
December 2025