Lecture Slide 8
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Questions and Answers

What is the primary function of a microwave altimeter?

  • To compute an object's height above a stable point (correct)
  • To measure the speed of wind
  • To detect sea ice and land contamination
  • To measure the depth of the sea surface

What is the term associated with the computation of depth beneath the sea surface?

  • Scatterometry
  • Altimetry
  • Radiometry
  • Bathymetry (correct)

What type of systems are more affected by rain, especially in Ku-band systems?

  • Microwave scatterometers (correct)
  • Microwave radiometers
  • Microwave sensors
  • Microwave altimeters

What is the name of the device that computes an object's height above a stable point?

<p>Altitude meter (B)</p> Signup and view all the answers

What is the principle of operation of microwave altimeters?

<p>They transmit short microwave pulses and measure the round trip time delay (D)</p> Signup and view all the answers

What is the primary purpose of microwave scatterometers?

<p>To achieve high accuracy measurements of wind vectors (A)</p> Signup and view all the answers

What is the primary factor that affects the intensity of backscattered energy in scatterometry?

<p>Roughness and dielectric properties of the target (B)</p> Signup and view all the answers

What is the typical resolution of wind maps produced by scatterometers?

<p>25-50 km (D)</p> Signup and view all the answers

What is the advantage of using microwave scatterometers in terms of weather conditions?

<p>They are available irrespective of weather conditions (A)</p> Signup and view all the answers

What is the relationship between wind stress and the size of surface ripples on the ocean?

<p>Wind stress depends on the size of surface ripples (D)</p> Signup and view all the answers

What type of technique did the ERS and NSCAT instruments employ for wind retrieval?

<p>Fanbeam (B)</p> Signup and view all the answers

What is the primary application of scatterometer data in weather forecasting?

<p>Cyclonic feature prediction (D)</p> Signup and view all the answers

What is the approximate daily coverage of global oceans by a single scatterometer instrument?

<p>90% (D)</p> Signup and view all the answers

What is an emerging application of scatterometer data beyond ocean winds?

<p>Soil moisture measurement (A)</p> Signup and view all the answers

Which of the following scatterometers is onboard the Metop satellite?

<p>ASCAT (D)</p> Signup and view all the answers

What is the primary application of the dependence on the incidence angle in microwave scatterometry?

<p>Deriving wind speed (B)</p> Signup and view all the answers

What is the main difference between fan beam scatterometers and rotating pencil beam scatterometers?

<p>Beam shape and scanning method (D)</p> Signup and view all the answers

Which of the following situations can compromise the quality of scatterometer winds?

<p>Sea ice and land contamination (D)</p> Signup and view all the answers

What is the primary advantage of microwave scatterometers over other wind measurement techniques?

<p>Global coverage (C)</p> Signup and view all the answers

Which of the following instruments is an example of a fan beam scatterometer?

<p>ASCAT (C)</p> Signup and view all the answers

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