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RES511S - REMOTE SENSING 1 - 1ST OPP - JUNE 2024 |
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nAmlBIA unlVERSITY
OF SCIEnCE Ano TECHnOLOGY
FACULTY OF ENGINEERING AND THE BUILT ENVIRONMENT
DEPARTMENTOF LAND AND SPATIALSCIENCES
QUALIFICATIONS:
DIPLOMA IN GEOMA TICS, BACHELOR OF GEOMATICS, BACHELOR OF GEOINFORMATION
TECHNOLOGY
QUALIFICATIONCODES:
LEVEL: 5
06DGEO, 07BGEO, 07BGEI
COURSECODE: RES512S
DATE: JUNE 2024
COURSENAME: REMOTE SENSING1
SESSION:1
DURATION: 3 HOURS
MARKS: 100
FIRST OPPORTUNITY EXAMINATION QUESTION PAPER
EXAMINER:
Ms Roxanne Murangi
MODERATOR: Ms Celeste Espach
INSTRUCTIONS
1. Write your student number on each answer sheet used.
2. Answer ALL the questions.
3. Read each question carefully before attempting to answer.
4. Write clearly and neatly.
PERMISSIBLEMATERIALS
1. Non-Programmable Calculator.
2. Pen.
3. Pencil.
4. Eraser and ruler.
This paper consistsof six (6) pages(includingthis cover page)
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Remote Sensing 1
Question 1
RESSllS
Answer the multiple-choice questions listed below. Please select the ONE most relevant
response to the following questions. Indicate the correct answer on the answer sheet.
1.1. The velocity of light can be given as ____
_
(2)
A. 1*108m/s
B. 3.9*10 8m/s
C. 3*10 8m/s
D. 3*10 18m/s
1.2. The relation between velocity, wavelength and frequency can be given as.
(2)
A. A.=c/r
B. A= CI f
C. A.=c/h
D. A.= h*c / f
1.3. Polar-orbiting satellites are generally placed at an altitude range of___ _
(2)
A. 7-15 km
B. 7000-15000 km
C. 700-1500 km
D. 70-150 km
1.4. Select which single answer, in the correct order of words, you think will complete
these statements to make it true:
An "Atmospheric Window" is a region of the spectrum where incoming light is __
and is not __ by atmospheric particles. These windows are regions, which in
remote sensing, are used to study the properties of the __ .
(2)
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June 2024
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Remote Sensing 1
A. Transmitted, absorbed, atmosphere
B. Absorbed, transmitted, atmosphere
C. Transmitted, absorbed, earth's surface
D. Absorbed, transmitted, earth's surface
RESSllS
1.5. Select the correct choice which will complete this sentence to make it true: A short
wavelength has __ frequency and __ energy.
(2)
A. Low, low
B. Low, high
C. High, high
D. High, low
(10]
Question 2
2.1. What is remote sensing?
(5)
2.2. What are the names and heights above the earth's surface of the three (3) orbital
height reglons that satellites can orbit in7
(3)
2.3. Figure 1 shows a schematic of the many types of electromagnetic radiation and their
applications. Answer the following questions with this schematic:
(4)
7
Q
I
1
2
3
I I 4
5
6
7
Figure 1
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Remote Sensing 1
RESSllS
2.4. Indicate which part of the electromagnetic spectrum is represented by the letters A
through G. (Each correct answer will count 0.5 marks).
(3.5)
2.5. Indicate what each electromagnetic radiation type can be used for as represented by
the numbers 1 to 7. (Each correct answer will count for 0.5 marks).
(3.5)
2.6. Outline the main characteristics of remote sensing data.
(8)
2.7. Quantity of is scattering driven by which factors?
(3)
(30)
Question3
3.1. What are the major differences between Mie, Raleigh, and Non-selective scattering? (3)
3.2. How does Radar remote sensing work, and provide three advantages?
(6)
3.3. List at least two advantages of along-track scanners.
(2)
3.4. List the four types of resolution relevant to the field of remote sensing.
(4)
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Remote Sensing 1
3.5. Use Figure 2 to assist you in answering the following questions:
RESSllS
A
1 Mtttr
I
I.
I
'
I - ••
B
- -SMt"l~I\\
\\
I
I
I
I
I
I
-i= . J -·- ~", I;
lolil
_' .','.,'_'
'
I
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I•
1
r· - -~I ,_I --- '..__,.....-.-.J
.,.~i
Figure 2
)OMow,
I
a} Which of these four resolutions relevant to the field of remote sensing do you
think this specific Figure 2 refers to? Explain your answer.
(3}
b) Each of the resolutions relevant to the field of remote sensing has specific scales
(high, medium, and low), which scales are represented in Figure 2? Include the
scale range values.
(3)
3.6. What are the four (4) levels in image processing?
(4}
(25]
Question 4
4.1. You wish to acquire an image making use of a drone that will have a ground resolution
of 4 cm/pixel (IFOV). The camera to be used in the drone has a FOV of 54° and it
produces images that have an image resolution (w*h) of 1900*1450. Calculate the
required flight height (in ft) that is required to obtain this ground resolution. Show all
your calculation steps. (Round to two (2) decimal places for meters).
(10)
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Remote Sensing 1
RESSllS
4.2. A camera having a focal length of 35 cm is used to take a vertical photograph of a
terrain having an average elevation of 2500 metres. What is the height above sea level
at which an aircraft must fly to get the scale of 1: 9500?
(10)
4.3. A map with a final scale of 1:10,000 needs to be produced. It is decided to use aerial
photographs with a scale of 1:30,000. Using the standard lens of 135 mm (focal
length) calculate the flight height of the plane. (Roundto three (3) decimal placesfor
meters andfeet to the nearest wholenumber).
(10)
4.4. What is the wavelength {µm) of electromagnetic radiation with a frequency of 3000
MHz?
{5)
[35)
1. '
r'
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June 2024