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RES511S - REMOTE SENSING 1 -2ND OPP - JULY 2023 |
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nAm·101A unlVERSITY
OF SCIEnCE Ano TECHnOLOGY
FACULTY OF ENGINEERING AND THE BUILT ENVIRONMENT
DEPARTMENTOF LAND& SPATIALSCIENCES
QUALIFICATION(S}: Bachelor of Geoinformation Technology; Diploma in Geomatics; Bachelor of
Geomatics
QUALIFICATION CODE (S}: 07BGEI;
06DGEM;06DGEO;07BGEO
LEVEL: 5
COURSE CODE: RES511S
COURSE NAME: REMOTESENSING1
SESSION: JULY 2023
PAPER: THEORY
DURATION: 3 HOURS
MARKS: 100
SECOND OPPORTUNITY/SUPPLEMENTARY EXAMINATION QUESTION PAPER
EXAMINER(S}
Dr Oluibukun Ajayi
MODERATOR:
Ms Celeste Espach
INSTRUCTIONS
1. Answer ALL the questions.
2. Write clearly and neatly.
3. Number the answers clearly.
4. All calculations, unless otherwise specified, must be rounded off to the 3rd decimal.
5. Include the formulas used for each worked calculation
PERMISSIBLE MATERIALS
Calculator and required stationery
THIS QUESTION PAPER CONSISTS OF _3_ PAGES (Including this front page)
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Remote Sensing 1
RES5115
SECTION ONE - Short answer questions (40 marks in all)
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
1.10
1.11
1.12
1.13
1.14
1.15
1.16
1.17
1.18
1.19
1.20
1.21
What are the three (3) sources for obtaining digital remote sensing data?
{1.5)
What are the four (4) basic operations of digital image processing in remote sensing?
(2)
What are the five (5) keywords that define Remote sensing?
(2.5)
A raster image is an image that consists of---------------- and----------------
(1)
An image showing set of data points in space defined by XYZis known as?
(1)
Spectral responses of Earth's surface in specific wavelengths is defined as?
(1)
The value range of Digital Numbers is dependent on-------------------
(1)
The DN values of an image that has not been atmospherically corrected can be defined as-------- (2)
The type of resolution that defines level of detail in image is known as-----------
(1)
The type of resolution that describes actual information content in image is known as--------
(1)
The size of an area for which brightness value is stored is called?
(1)
Scanner samples images with---------------- and measures brightness per ------------
(2)
How are images created from point clouds?
(2)
What is the primary aim of image correction?
(2)
The two major types of corrections in image pre-processing are?
(2)
What are the major applications of the following satellite frequencies in remote sensing
(4)
a) Ka
b) L
c) C
d) S
Based on orbital heights, what are the three main classes of satellite orbits?
(3)
Based on the interaction of EM energy in the atmosphere, what are the three types of scattering? (3)
Based on the interaction of the EM energy with the earth surface, what are the three (3) possibilities
that define what becomes of the energy?
(3)
What are sensor platforms?
(2)
Differentiate between Passive and Active sensors.
(2)
[Total of Section: 40]
Second Opportunity/Supplementary Question Paper
Page /2
July 2023
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Remote Sensing 1
RES511S
SECTION TWO (60 Marks)
2.1 A set of panchromatic aerial photos has a scale of 1:10,000 that need to be scanned (at 8 bit
resolution) in such a way that the final ground resolution is 50 cm.
a. What will be the scanning resolution in µm (2nd decimal) and in dpi (rounded number)?
(9)
b. What will be the size of the images in Bytes, Kb and Mb?
(3)
2.2 A set of panchromatic aerial photos has a scale of 1:10,000 that needs to be scanned (10 bit) with a
scanning resolution of 15 µm. What will be the final ground resolution?
(8)
2.3 What is the wavelength (nm) of electromagnetic radiation with a frequency of 3,000 MHz? Ensure
to show all or write down all your calculations.
(5)
2.4 How would you alter your UAV flight plan from a general mapping flight to a flight over a forested
area?
(5)
2.5 You wish to digitally compare an analogue aerial photo taken of Stampriet (Latitude 24.3436° S,
and Longitude 18.4024° E) in 1996 (1:35,000), and compare it with the digital aerial photo taken in
2018, to determine how much growth has occurred in the town. What is the aerial photo "address"
you will need to obtain these photos when you go to the MLR? Provide a degree square diagram to
explain how you arrived at your final address.
(10)
2.6 A vertical photograph was taken at an altitude of 1200 m above mean sea level. Determine the
scale of the photograph for terrain lying at elevations of 80 m and 300 m if the focal length of the
camera is 15 cm (in representative fraction).
(10)
2.7 A section line AB appears to be 10.16 cm on a photograph for which the focal length is 16 cm. The
corresponding line measures 2.54 cm on a map which is to a scale 1:50,000. The terrain has an
average elevation of 200 m above mean sea level. Calculate the flying altitude of the aircraft above
mean sea level, when the photograph was taken.
(10)
[Total of Section: 60]
Second Opportunity/Supplementary Question Paper
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July 2023