SAR for Detecting and Monitoring Floods, Sea Ice, and Subsidence from Groundwater Extraction

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This assignment includes questions from the 3 parts of the webinar series "SAR for Detecting and Monitoring Floods, Sea Ice, and Subsidence from Groundwater Extraction". We recommend writing down your answers on a piece of paper or in a Word document before submitting. You will not be able to save your answers and complete this form at a later time.

To receive a course completion certificate, you must have attended all 3 live parts and completed this assignment by Nov. 17, 2023. When you submit the assignment, you will receive an email with a copy of your responses.

Once you click to submit, you can click "View Score" to see your results.

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Name (First Last) *

Sea ice looks different to the radar signal when it is melting and when it is freezing. *

5 points

True

False

SAR can be used to identify sea ice thickness. *

5 points

True

False

SAR “sees“ sea ice surface roughness and volume inhomogeneities (e.g. air inclusions, brine pockets, large snow grains, etc.).

5 points

True

False

Young ice is easy to detect and monitor because it has a very specific SAR signature. *

5 points

True

False

Changes in salinity in sea ice changes the dielectric constant and affects the penetration depth of the SAR signal.

5 points

True

False

Please indicate the correct statement/s related to the scattering mechanisms from sea ice using different wavelengths.

5 points

X- and C-band scattering occurs primarily from the surface

S-band scattering occurs partly from the surface and partly from ice volume

L-band scattering occurs primarily from ice volume

All of the above

HV provides better separation between: *

5 points

Sea ice and land ice

Sea ice and polar bears

Open water and sea ice

Open ocean water and inland water

Required

An interferogram is created using the SAR:
*

5 points

Amplitude

Phase

HH polarization

HH and HV polarizations

Low coherence or decorrelation for any reason causes:

5 points

a gain in information

a loss of information

it has no effect

Some of the challenges in detecting subsidence due to groundwater extraction with SAR are: *

5 points

Vegetation growth

Atmospheric effects

Snow melt

All of the above

Correlation effects multiply, unlike phase effects that add.

5 points

True

False

The longer the radar wavelength the lower the penetration depth. *

5 points

True

False

Calm open water surfaces appear smooth to the radar signal. Select the scattering mechanism expected in this case.

5 points

Double bounce reflection leading to very high backscatter

Volume scattering leading to high backscatter

Specular reflection leading to low backscatter

Myopic reflection leading to erratic backscatter

Required

Through a period of two months the land surface goes from dry to wet to the formation of open water bodies. How will the SAR time series signal look like? *

5 points

Initially low but increase as soil moisture increases and then decrease as water bodies appear on the surface

Initially high but decrease as soil moisture increases and then decrease as water bodies appear on the surface

Inundated vegetation is dominated by:

5 points

Rough surface scattering

Specular reflection

Volume scattering

Double bounce

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