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GRS811S - GIS AND REMOTED SENSING IN PRACTICE - 1ST OPP - JUNE 2023 |
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nAm I BI A un IVERS ITY
OF SCIEnCE Ano TECHnOLOGY
FACULTY OF HEALTH, NATURAL RESOURCES AND APPLIED SCIENCES
SCHOOL OF AGRICULTURE AND NATURAL RESOURCE SCIENCES
DEPARTMENT OF NATURAL RESOURCE SCIENCES
QUALIFICATION: BACHELOR OF NATURAL RESOURCEMANAGEMENT HONOURS
QUALIFICATION CODE: 09MNRM
COURSE CODE: GRS811S
LEVEL: 8
COURSE NAME: GIS AND REMOTE SENSING IN
PRACTICE
DATE: June 2023
DURATION: 3 HOURS
MARKS: 90
FIRST OPPORTUNITY EXAMINATION QUESTION PAPER
EXAMINER(S) Prof. Vera De Cauwer
MODERATOR: Ms. Foibe Nelao Johannes
INSTRUCTIONS
1. Number your answers clearly.
2. Show your detailed work for calculations.
PERMISSIBLE MATERIALS
1. Calculator
THIS QUESTION PAPER CONSISTS OF 4 PAGES (Excluding this front page)
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Question 1
[18]
Convert the following coordinates to decimal format. Indicate clearly which coordinate is
latitude and which is longitude.
1. 22° 18.9' S, 15° 54.2' E
2. 18° 39' 57" s, 23° 8' 22" w
3. S 20° 25.1251', E 19 ° 19.7381'
Question 2
[S]
Radar systems can collect remote sensing data from a plane or a satellite.
a) What does the acronym RADAR mean?
b) Give two examples of applications in which Radar can be used.
c) What are the advantages of using an active microwave sensor (compared to a
passive sensor)?
Question 3
[5]
You start a new project in QGIS and you add the layers trees.gpx and admin.shp to the
project. The file extension .shp stands for ........... Next to admin.shp, two other files are
needed to open the admin layer: ........................and ............................The data of the
trees.gpx file was collected with a .............. You save your QGIS project as a file with the file
extension .....
Question 4
[9]
Below is an attribute table of a GIS layer.
1. How many features does the GIS layer contain?
2. List the attributes (fields) of the GIS layer.
3. What is "ID" referring to? Explain what it stands for.
4. Is this a vector or a raster layer? Explain briefly why.
5. Does the layer contain points, lines or polygons? Explain briefly why.
ID Vegetation
6 Grassland
2 Woodland
3 Shrubland
9 Shrubland
11 Woodland
8 Bare
Area Fenced
25.2 y
12.1 N
35.0 N
28.1 y
11.9 y
2.3
y
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Question 5
(7)
a) What is a vegetation index?
b) Why are vegetation indices used?
c) Which is the most used vegetation index?
d) Why do areas with no vegetation have a low vegetation index?
Question 6
(9)
Electromagnetic radiation consists of electromagnetic waves characterised by wavelength and
frequency.
1. Explain wavelength and indicate the measurement unit.
2. Explain frequency and indicate the measurement unit.
3. What is the relation between wavelength and frequency? What is this expression
representing?
4. Give an example of electromagnetic radiation with a large wavelength.
5. Give an example of electromagnetic radiation with a high frequency.
Question 7
(21)
Indicate if the following statements are True or False. If false. correct the statement.
1. Thermal radiation from animals and humans is emitted in the visible light range.
2. The distance between two meridians of longitude is a constant (always the same).
3. Lines are composed of at least three vertices that are connected.
4. Each cell of a raster image stores a single value.
5. Green plants absorb green light.
6. The location 1,215,000 m E; 581,355 m S is expressed in geographical coordinates.
7. Thermal radiation can be carried through a vacuum.
8. It is best to use satellite images of the warm, dry season to map vegetation in Namibia.
9.
Terrain
slope
can
be
expressed
in
degrees
(0
)
or
in
per
cent
(%).
10. Google Earth is a GIS.
11. The EISis a local data repository that contains GISdata.
12. A map scale of 1:250,000 is larger than a map scale of 1:25,000.
13. The location with latitude 15.55 and longitude - 22.15 is south of the equator.
Question 8
(5)
During a guest lecture, the use of hyperspectral satellite images for research in the
ProNamib Nature Reserve was demonstrated.
1) What is a hyperspectral image?
2) How can the data be verified in the field?
3) Give an example of a hyperspectral satellite.
4) What advantage has hyperspectral data compared to multispectral data for
rangeland management?
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Question 9
[4]
Terrain relief is useful to show on a map.
a) Define terrain relief.
b) Explain the different methods to show terrain relief on a map.
c) Name a type of map that has always terrain relief data shown on it.
Question 10
[7]
You are collecting samples at sampling stations placed every 10 kilometres along a transect.
The transect runs along a meridian of longitude, starting at latitude -20° and ending at
latitude -22°.
a) What is a transect?
b) Are you performing a random or a systematic sampling?
c) How many sampling stations do you have? Explain our answer.
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