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RADARSAT Image Interpretation

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Questions and Answers

What is the cause of the bright linear features that appear at approximately constant range in SAR images?

Diffuse reflection from vegetated areas

Scattering returns from calm water surfaces

Constructive interference from adjacent targets

Specular reflection from targets within a very narrow slant range distance (correct)

What is the term used to describe the pattern of spatial tone variations in SAR images?

Tone

Speckle

Scattering returns

Texture (correct)

What is the effect of pulse compression on nadir returns in SAR images?

Eliminates the effect of scattering returns

Restricts the bright return to a small number of range cells (correct)

Reduces the strength of the returns

Increases the range of the returns

What is the cause of scalloping in SAR images?

Improper estimation of Doppler Centroid Signup and view all the answers

What is the term used to describe the unwanted brightness variation in SAR images due to radar artifacts?

Speckle Signup and view all the answers

What is the primary purpose of multi-looking in SAR image processing?

To reduce speckle noise in the final image Signup and view all the answers

What is the result of reducing speckle noise in SAR images?

Decreased radiometric resolution Signup and view all the answers

What is the term for the statistical fluctuation or uncertainty associated with the brightness of each pixel in a radar image?

Speckle Signup and view all the answers

What is the result of azimuth ambiguity in SAR images?

Ghosting of the target image Signup and view all the answers

In what environment is spatial filtering typically performed to reduce speckle noise in SAR images?

In a digital image analysis environment Signup and view all the answers

What is the result of local constructive interference in a radar image?

Bright speckles Signup and view all the answers

In a radar image, what is the characteristic appearance of speckle noise?

A grainy 'salt and pepper' texture Signup and view all the answers

What is the primary cause of fading in a coherent imaging system?

Variation in the phase delay caused by multiple targets Signup and view all the answers

What is the term for the fixed relationship between waves in a beam of electromagnetic radiation?

Coherence Signup and view all the answers

What type of imagery is inherently prone to speckle noise?

SAR imagery Signup and view all the answers