Lecture 3 Slides

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What is the primary factor that determines the type and degree of relief displacement in a radar image?

Local slope of the ground (correct)

Altitude of the radar sensor

Distance from the radar sensor to the target

Frequency of the radar beam

What occurs when the angle of the radar-facing slope is less than θi?

Relief displacement is minimized

Layover occurs

Foreshortening occurs (correct)

Radar shadow is created

What happens when the local incident angle is 90°?

Foreshortening reaches a maximum (correct)

Layover occurs

Radar shadow is minimized

Relief displacement is eliminated

What is the result when the angle of the radar-facing slope is greater than θi?

Layover occurs Signup and view all the answers

What is created when the radar beam is blocked by a feature?

Radar shadow Signup and view all the answers

What is the main reason for acquiring opposing look directions in areas with high relief?

To fill in areas of radar shadow Signup and view all the answers

What is the definition of local incident angle?

The angle between the radar line of sight and the line normal to the local slope Signup and view all the answers

What is the largest source of error in radiometric calibration?

Local incident angle Signup and view all the answers

Why do radar and optical systems exhibit different topographic displacement?

Due to differences in imaging geometries Signup and view all the answers

What is the effect of local incident angle on image brightness per pixel?

It can have a large effect Signup and view all the answers

What is the primary importance of radar shadow in radar imagery?

For terrain relief interpretation Signup and view all the answers

What is the result of foreshortening in radar images?

A relatively brighter appearance of slopes facing the radar Signup and view all the answers

At what incident angle is foreshortening at a maximum?

When the incident angle is 0° Signup and view all the answers

What is the trade-off in selecting incident angle in SAR image analysis?

Between shadowing and foreshortening Signup and view all the answers

What is the result of a grazing angle in radar imagery?

Severe shadowing and eliminated foreshortening effects Signup and view all the answers

What is the effect of a small local incident angle on radar returns?

Brighter radar returns Signup and view all the answers

What is the term for the minimum distance that describes how well the radar can discriminate closely spaced reflectors?

Resolution cell Signup and view all the answers

What is the effect of a larger local incident angle on radar returns?

Darker radar returns Signup and view all the answers

What is the name of the discipline that uses slope-induced radiometric effects in SAR image analysis?

Geomorphology Signup and view all the answers

What is the name of the phenomenon where a radar signal is displaced horizontally due to topographic displacement?

Foreshortening Signup and view all the answers