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ISM520S - INTRODUCTION TO SURVEY AND MAPPING - IST OPP - NOV 2023 |
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nAm I Bl A u n IVE RS ITY
OF SCIEnCE Ano TECHnOLOGY
FACULTYOF ENGINEERINGAND THE BUILTENVIRONMENT
DEPARTMENT OF LAND AND SPATIALSCIENCES
QUALIFICATION: BACHELOROF QUANTITY SURVEYING, BACHELOR OF GEOINFORMATION TECHNOLOGY,
BACHELOROF LAND ADMINISTRATION, BACHELOR OF ARCHITECTURE, BACHELOR OF TOWN AND
REGIONAL PLANNING
QUALIFICATION CODE: 07BQOS, 07BGEI,
07BLAM, 07BARC, 07BTAR
LEVEL:5
COURSE: INTRODUCTION TO
SURVEYAND MAPPING
COURSECODE: ISM520S
SESSION: NOVEMBER 2023
PAPER:
THEORY
DURATION: 3 HOURS
MARl<S:
100
FIRSTOPPORTUNITYEXAMINATION QUESTION PAPER
EXAMINERS: Ms D. Husselmann and Mr D. Varges
MODERATOR: Mr S. Sinvula
THIS QUESTIONPAPERCONSISTSOF 10 PAGES(Including this front page)
INSTRUCTIONS
1. Answer ALL the questions.
2. Write clearly and neatly.
3. Number the answers clearly.
4. Answers to calculations must be rounded off to three decimal places, excluding
answers to co-ordinate conversions
PERMISSIBLEMATERIALS
1. Calculators and other drawing equipment
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Introduction to Survey and Mapping
Question 1
Answer the following questions by selecting the correct statement for each:
ISM520S
(10)
1.1.
The result of all observations e.g. a mean distance or angle, taking all
readings/observations into account is known as a:
a. Measurement
b. Levelling
c. Observation
d. Correction
1.2.
The difference between the measured value and the true value of a reading or
observation is called the:
a. Correction
b. Error
c. Residual
d. Prarallax
1.3.
Which of the following instruments can oniy measure angles?
a. Total Station
b. Level
c. Theodolite
d. GPS
1.4.
For which of these levels are the telescope and vertical spindle cast as one piece?
a. Automatic Level
b. Tilting Level
c. Dumpy Level
d. Digital Level
1.5.
Which among the following is one of the principles of leveling?
a. Taking measurements
b. Covering entire area
c. Determining the DY and DX differences
d. Never move both the staff and the instrument at the same time
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Introduction to Survey and Mapping
1.6.
Parallax can be eliminated by focusing the eye piece and objective.
a. True
b. False
c. Maybe
d. None of these
ISM520S
1.7.
Close contours of decreasing values towards their centre, represent a
a. Hill
b. Depression
c. Saddle
d. River bed
1.8.
Contours of different elevations may cross each other only in the case of an
a. Over hanging cliff
b. Vertical cliff
c. Pass
d. Valley
1.9.
The Reference object in angular observations must fulfil the following requirement(s):
a. It must be a well-defined point
b. It must not be to close or too far
c. It does not have to have co-ordinates
d. All the above
1.10.
A permanent reference point or mark, of known height above a datum, is called
a. Reference point
b. Bench mark
c. Datum point
d. Witness mark
[10]
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Introduction to Survey and Mapping
Question 2
2.1. Define the term "Surveying".
ISM520S
(2)
2.2. Differentiate between a map and a plan.
(2)
2.3. There are TWO principal classifications of surveying. Name and fully explain both.
(4)
2.4. List three checks for blunders done during levelling calculation? (Write down the formulas)
that should result in the same answer.
(3)
2.5. What are the following called?
(2)
a. Determining the reduced level of a point that is above the line of sight of the instrument
such as a ceiling, underside of a bridge, balcony, roof of underground mine etc.The staff
is turned upside -down, the bottom of the staff is placed against the point/mark for
which the reduced level needs to be determined, and a reading is taken.
b. A true to scale representation of features on the ground.
2.6. Draw and label the axes (orientation) of the Namibian LO coordinate system. Indicate the
signs for both Y and X in each quadrant.
(4)
2.7. What are the purposes of a Reference Object (R/O)?
(3)
2.8. Explain why slope corrections must be applied to EDM measurements.
(3)
2.9. List three of the corrections applied to tape-measured distances.
(3)
[26)
Question 3
3.1. Distinguish between a Closed Traverse and an Open Traverse.
(4)
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Introduction to Survey and Mapping
ISM520S
3.2. Describe the procedure for horizontal setting out of a feature such as a road or a pipeline or a
building or an erf, etc.
(4)
3.3. List two advantages and two disadvantages of using GPS/GNSS.
(4)
3.4. Briefly describe ANY TWO characteristics of Contours.
(2)
[14]
Question 4
4.1 The levelling field observations on Data Sheet 1 were carried out by a Land Surveying student
doing in-service training at NAVACHABGOLDmine. Reduce the data sheet using the "RISEand
FALL" method t~ determine the final heights. All checks need to be shown and the correction
needs to be distributed.
(10)
4.2 Given the field book below, calculate final observed directions from the Mean observed
directions. Complete in column form using table 1.
(6)
@Res
HI= 1.812m
Point/Station
Mean Observed Directions
t:i.Uitdraai
137° 16' 04"
t:iS. omnabab
243° 23' 21"
t:i.Eises
0° 06' 00"
Fence
129° 11' 07''
RO
137° 16' 12"
4.3 Point Pl is at a reduced horizontal distance of 819.157 metres from RMl and on a direction
which can be reduced from the following horizontal angular observations. Determine the
oriented direction to Pl by completing table 2 then calculate the co-ordinates of Pl using
(16)
oriented direction.
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Introduction to Survey and Mapping
Co-ordinates
Name
RMl
t:,,Trig B
t:,,Trig C
V
-2 756.460
-1 961.570
-6 520.650
X
+18 445.000
+14 268.710
+18 443.800
ISM520S
@RMl
HI= 1.656m
Point/Station
Fin. Observed Dir.
t:,,Trig B
169° 13' 53"
t:,,Trig C
269° 59' 20"
Pl
101° 43' 19"
[32]
Question 5
5.1 Compute the data traverse shown below for ERF 121 starting at E2 and ending at D, using
information from an excerpt of a plan as shown below. Determine final coordinates for points
A, Band C. Use traverse sheet on data sheet 3 to answer this question.
(18)
BLOCI<CORNERS
CO -ORDINATES
System Lo 22/15°
Constants V ± 0.00
X ± 0.00
Al
-75 169.220
-467 528.800
A2
-75 180.620
-467 536.710
A3
-75 214.910
-467 551.810
A4
-75 221.860
-467 519.900
El
-75 519.010
-467 465.280
E2
-75 591.250
-467 473.020
E3
-75 682.630
-467 414.620
E4
-75 657.000
-467 374.510
D
-75 543.870
-467 467.940
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Introduction to Survey and Mapping
ISM520S
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[18]
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Introduction to Survey and Mapping
Student Number _________
_
Question 4.1
Riseand Fall LevellingSheet
ISM520S
Data Sheet 1
NOTE:The BOLDand Underlined values are the Inverted Staff Readings.
Answers should be to 3 (0.000) decimal places.
Point
A
B
C
D
E
F
G
H
B.S.
3.565
2.192
1.515
I.S.
3.077
-2.538
0.735
1.860
F.S.
1.510
2.523
0.672
Rise
Reduced
Fall
Heights
Correction
Final
Heights
1299.070
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Introduction to Survey and Mapping
ISM520S
Student Number _________
_
Question 4.2
Table 1: Final Observed directions
Data Sheet 2
Point/
Station
/J.Uitdraai
/J.Somnabab
/J.Eises
Fence
R/0
Mean
Correction
137° 16' 04"
243° 23' 21"
0° 06' oo"
129° 11' 07''
137° 16' 12"
Fin. Observed
Direction
Question 4.3
Table 2: Oriented Direction
@RMl
Name
/J.Trig B
/J.TrigC
Pl
Fin. Observed
Direction
169° 13' 53"
269° 59' 20"
101° 43' 19"
Join
Direction
Difference
/ Correction
Oriented
Direction
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Introduction to Survey and Mapping
Student Number _________
_
Question 5.1
Traverse Sheet
ISM520S
Data Shee,t_3
Direction
Join
Distance (m)
Differences
/lY
llX
Point
E2
Final Coordinates
y
-75591.250
X
-467473.020
A
B
z
0
C
--!
z
mnm
V'l
V'l
)>
D
D
-75543.870
-467467.940
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