20 Questions
What is the primary factor that determines the type and degree of relief displacement in a radar image?
Local slope of the ground
What occurs when the angle of the radar-facing slope is less than θi?
Foreshortening occurs
What happens when the local incident angle is 90°?
Foreshortening reaches a maximum
What is the result when the angle of the radar-facing slope is greater than θi?
Layover occurs
What is created when the radar beam is blocked by a feature?
Radar shadow
What is the main reason for acquiring opposing look directions in areas with high relief?
To fill in areas of radar shadow
What is the definition of local incident angle?
The angle between the radar line of sight and the line normal to the local slope
What is the largest source of error in radiometric calibration?
Local incident angle
Why do radar and optical systems exhibit different topographic displacement?
Due to differences in imaging geometries
What is the effect of local incident angle on image brightness per pixel?
It can have a large effect
What is the primary importance of radar shadow in radar imagery?
For terrain relief interpretation
What is the result of foreshortening in radar images?
A relatively brighter appearance of slopes facing the radar
At what incident angle is foreshortening at a maximum?
When the incident angle is 0°
What is the trade-off in selecting incident angle in SAR image analysis?
Between shadowing and foreshortening
What is the result of a grazing angle in radar imagery?
Severe shadowing and eliminated foreshortening effects
What is the effect of a small local incident angle on radar returns?
Brighter radar returns
What is the term for the minimum distance that describes how well the radar can discriminate closely spaced reflectors?
Resolution cell
What is the effect of a larger local incident angle on radar returns?
Darker radar returns
What is the name of the discipline that uses slope-induced radiometric effects in SAR image analysis?
Geomorphology
What is the name of the phenomenon where a radar signal is displaced horizontally due to topographic displacement?
Foreshortening
This quiz covers the effects of opposing look directions on radar imagery in agricultural fields and areas with high relief. It also touches on the acquisition of radar data using ascending and descending passes. Test your understanding of RADARSAT and remote sensing!
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