1. Which is a common application of SAR in disaster management?
A. Monitoring crop health
B. Detecting oil spills
C. Mapping forest fires and flood zones
D. Monitoring ocean currents
Answer: C) Mapping forest fires and flood zones
Rationale: SAR is frequently used to monitor natural disasters like
floods, forest fires, and landslides due to its ability to capture data
through cloud cover and smoke.
2. What type of SAR image is most useful for detecting urban
infrastructure?
A. InSAR images
B. PolSAR images
C. High-resolution SAR images
D. ScanSAR images
Answer: C) High-resolution SAR images
Rationale: High-resolution SAR images are ideal for detecting fine
details, such as buildings, roads, and other urban infrastructure,
because they can capture fine surface features.
3. What is the key disadvantage of using SAR for Earth observation?
A. Limited spatial resolution
,B. Sensitivity to weather
C. Complex data processing
D. High operational cost
Answer: C) Complex data processing
Rationale: SAR data requires significant processing to form
interpretable images, as the raw data is often complex and needs
advanced algorithms to convert into useful information.
4. Which of the following is a key advantage of SAR over optical
remote sensing?
A. Higher image resolution
B. Ability to capture data in all weather conditions
C. Faster data acquisition
D. Lower operational cost
Answer: B) Ability to capture data in all weather conditions
Rationale: Unlike optical remote sensing, SAR can acquire data during
day or night and through cloudy or rainy weather, as it doesn't rely on
sunlight.
5. What is the primary limitation of using SAR for vegetation studies?
A. SAR cannot detect vegetation
B. SAR is less effective in clear weather
C. SAR is sensitive to surface roughness and moisture content
D. SAR cannot detect changes in vegetation density
Answer: C) SAR is sensitive to surface roughness and moisture content
, Rationale: SAR is sensitive to the roughness and moisture content of
the surface, which can affect its ability to detect certain vegetation
types accurately.
6. What factor influences the radar's penetration depth into the surface?
A. Polarization
B. Radar wavelength
C. Surface roughness
D. Image resolution
Answer: B) Radar wavelength
Rationale: The radar wavelength determines the penetration depth of
the SAR signal into the surface, with longer wavelengths capable of
penetrating deeper into materials like soil and vegetation.
7. Which of the following SAR modes provides continuous imaging
over a large area?
A. ScanSAR
B. Spotlight
C. StripMap
D. InSAR
Answer: A) ScanSAR
Rationale: ScanSAR is designed for continuous imaging over large
areas and provides a wide swath with moderate resolution, making it
ideal for large-scale environmental or agricultural monitoring.
8. Which platform is commonly used to carry SAR systems?
A. Monitoring crop health
B. Detecting oil spills
C. Mapping forest fires and flood zones
D. Monitoring ocean currents
Answer: C) Mapping forest fires and flood zones
Rationale: SAR is frequently used to monitor natural disasters like
floods, forest fires, and landslides due to its ability to capture data
through cloud cover and smoke.
2. What type of SAR image is most useful for detecting urban
infrastructure?
A. InSAR images
B. PolSAR images
C. High-resolution SAR images
D. ScanSAR images
Answer: C) High-resolution SAR images
Rationale: High-resolution SAR images are ideal for detecting fine
details, such as buildings, roads, and other urban infrastructure,
because they can capture fine surface features.
3. What is the key disadvantage of using SAR for Earth observation?
A. Limited spatial resolution
,B. Sensitivity to weather
C. Complex data processing
D. High operational cost
Answer: C) Complex data processing
Rationale: SAR data requires significant processing to form
interpretable images, as the raw data is often complex and needs
advanced algorithms to convert into useful information.
4. Which of the following is a key advantage of SAR over optical
remote sensing?
A. Higher image resolution
B. Ability to capture data in all weather conditions
C. Faster data acquisition
D. Lower operational cost
Answer: B) Ability to capture data in all weather conditions
Rationale: Unlike optical remote sensing, SAR can acquire data during
day or night and through cloudy or rainy weather, as it doesn't rely on
sunlight.
5. What is the primary limitation of using SAR for vegetation studies?
A. SAR cannot detect vegetation
B. SAR is less effective in clear weather
C. SAR is sensitive to surface roughness and moisture content
D. SAR cannot detect changes in vegetation density
Answer: C) SAR is sensitive to surface roughness and moisture content
, Rationale: SAR is sensitive to the roughness and moisture content of
the surface, which can affect its ability to detect certain vegetation
types accurately.
6. What factor influences the radar's penetration depth into the surface?
A. Polarization
B. Radar wavelength
C. Surface roughness
D. Image resolution
Answer: B) Radar wavelength
Rationale: The radar wavelength determines the penetration depth of
the SAR signal into the surface, with longer wavelengths capable of
penetrating deeper into materials like soil and vegetation.
7. Which of the following SAR modes provides continuous imaging
over a large area?
A. ScanSAR
B. Spotlight
C. StripMap
D. InSAR
Answer: A) ScanSAR
Rationale: ScanSAR is designed for continuous imaging over large
areas and provides a wide swath with moderate resolution, making it
ideal for large-scale environmental or agricultural monitoring.
8. Which platform is commonly used to carry SAR systems?
