Lecture Slide 5B
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Questions and Answers

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

  • To reduce speckle in the final detected image (correct)
  • To increase spatial resolution
  • To introduce constructive interference
  • To enhance radiometric resolution
  • What is the result of reducing speckle in SAR images?

  • Increased scattering returns
  • Improved spatial resolution
  • Enhanced radiometric resolution (correct)
  • Reduced automatic gain control effects
  • What is the primary cause of speckle in SAR images?

  • Incoherent illumination
  • Destructive interference
  • Scattering returns
  • Coherent illumination (correct)
  • What is the effect of azimuth ambiguity in SAR images?

    <p>A copy of the target appears offset in both range and azimuth</p> Signup and view all the answers

    What is the result of automatic gain control effects on SAR images?

    <p>Affected image radiometrics and geometrics</p> Signup and view all the answers

    What is the main cause of scintillating bright linear features in SAR images?

    <p>Specular reflection from targets within a very narrow slant range distance</p> Signup and view all the answers

    What is the pattern of spatial tone variations in an image referred to as?

    <p>Image texture</p> Signup and view all the answers

    What is the result of a radar pulse's return from an object and the return from the satellite's nadir?

    <p>Nadir Ambiguity</p> Signup and view all the answers

    What is the term used to describe the unwanted brightness variation in a radar image due to radar artifacts?

    <p>Scalloping</p> Signup and view all the answers

    What is the term used to describe the strength of radar backscatter in an image?

    <p>Image tone</p> Signup and view all the answers

    What is the primary cause of speckle noise in SAR imagery?

    <p>Random constructive and destructive interference</p> Signup and view all the answers

    What is the effect of speckle noise on the interpretation of SAR images?

    <p>It makes interpretation more difficult</p> Signup and view all the answers

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

    <p>To reduce the effects of speckle noise</p> Signup and view all the answers

    What occurs when reflections from individual blades of grass within a resolution cell combine?

    <p>Random constructive and destructive interference</p> Signup and view all the answers

    How can speckle noise be reduced in SAR imagery?

    <p>By averaging independent samples</p> Signup and view all the answers

    What is the result of local constructive interference in radar images?

    <p>Bright speckles</p> Signup and view all the answers

    What type of noise inherently exists in SAR imagery?

    <p>Speckle noise</p> Signup and view all the answers

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

    <p>Variation in the phase delay caused by multiple targets in a resolution cell</p> Signup and view all the answers

    What is the relationship between waves in a beam of electromagnetic radiation when they are coherent?

    <p>They are in phase</p> Signup and view all the answers

    What is the result of local destructive interference in radar images?

    <p>Dark speckles</p> Signup and view all the answers

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