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Remote Sensing Image Processing

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Questions and Answers

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

To enhance radiometric resolution

To reduce speckle noise in the final image (correct)

To correct for azimuth ambiguity

To increase spatial resolution

What is the effect of speckle reduction by spatial filtering on the output image?

It reduces the effect of azimuth ambiguity

It enhances radiometric resolution (correct)

It has no effect on the image resolution

It improves spatial resolution

What is the cause of azimuth ambiguity in SAR images?

Scalloping effects

Coherent illumination and processing

Platform or sensor problems (correct)

Automatic Gain Control effects

What is the result of a single look image in SAR processing?

An image with the highest achievable resolution and containing speckle Signup and view all the answers

What is the purpose of reprocessing in SAR image analysis?

To improve image radiometrics and geometrics Signup and view all the answers

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

Nadir Ambiguity Signup and view all the answers

What is the term for the corduroy-like radiometric banding that appears across the scene in SAR images?

Scalloping Signup and view all the answers

What is the term for the pattern of spatial tone variations in SAR images?

Texture Signup and view all the answers

What is the term for the unwanted brightness variation in SAR images caused by radar artifacts?

Radar Artifacts Signup and view all the answers

What is the term for the simultaneous returns from the desired illuminated region and a previously or successively transmitted pulse in SAR images?

Range Ambiguity Signup and view all the answers

What is the primary cause of speckle in SAR imagery?

Random constructive and destructive interference from multiple scattering returns Signup and view all the answers

What is the effect of speckle on the quality of SAR images?

It degrades the quality of the image, making interpretation more difficult Signup and view all the answers

What is the purpose of multiple-look filtering in SAR imagery?

To reduce the effects of fading and speckle Signup and view all the answers

What is the result of averaging independent samples in SAR imagery?

Effective reduction of the effects of fading and speckle Signup and view all the answers

What is the appearance of a homogeneous target, such as a grass-covered field, in an SAR image without speckle?

Light-toned pixels Signup and view all the answers