Introduction to Synthetic Aperture Radar: Homework 1

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1. What are the advantages of radar sensors? *

5 points

they can “see” through clouds

they can “see” the surface of the earth day/night

they can penetrate through a medium

all of the above

2. Wavelength is inversely related to frequency.

5 points

True

False

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3. What are the three radar parameters that need to be considered for any study?

5 points

wavelength, polarization, and dielectric

wavelength, incidence angle, and structure

wavelength, polarization, incidence angle

incidence angle, dielectric, and structure

Clear selection

4. What is the relationship between wavelength and penetration depth?

5 points

the longer the wavelength the lesser the penetration depth

the shorter the wavelength the greater the penetration depth

the longer the wavelength the greater the penetration depth

none of the above

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5. What do radar images provide information on?

5 points

dielectric and roughness

dielectric and temperature

roughness and soil moisture

roughness and barometric pressure

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6. What types of polarizations are commonly used in radar?

5 points

horizontal and trihedral

horizontal and vertical

triangular and vertical

vertical and trihedral

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7. What are the three main backscattering mechanisms?

5 points

specular reflection, triple-bounce, double-bounce

volume scattering, triple-bounce, roof scattering

roof scattering, double-bounce, specular reflection

specular reflection, volume scattering and double-bounce

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8. What is speckle?

5 points

triangular features in the image

salt and pepper texture in an image

circular features in the image

none of the above

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9. How can speckle be reduced?

5 points

multilooking

subsetting

spatial filtering

multilooking and spatial filtering

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10. What wavelength does SENTINEL-1A/B SAR’s use?

5 points

L-band

S-band

Ku-band

C-band

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11. How would you use radar remote sensing for your specific application? *

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