Characteristics of Remotely Sensed Data
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Questions and Answers

What determines the spectral resolution in an image?

  • The range of brightness values in the image pixels
  • The radiometric resolution expressed in bits
  • The frequency of the sensor visiting the location
  • The number of spectral bands and their division (correct)

    • What characterizes hyperspectral sensors in terms of spectral bands?

  • They contain more than 200 spectral bands with narrow divisions (correct)
  • They capture a low number of spectral bands
  • They typically range between 4 to 15 spectral bands
  • They have a wide division of the electromagnetic spectrum

    • How are digital numbers (DN) expressed in images?

  • By the number of spectral bands captured
  • Through brightness values in the image pixels
  • Through a binary series known as bits (correct)
  • By the radiometric resolution expressed in bits

    • What does radiometric resolution impact in images?

    <p>Ability to separate Earth's objects based on brightness differences</p> Signup and view all the answers

    How are positional and feature accuracies related to remote sensing images?

    <p>Positonal accuracy depends on spatial resolution, feature accuracy on other resolutions</p> Signup and view all the answers

    What does a high spectral resolution image contain?

    <p>A large number of spectral bands with fine division of the electromagnetic spectrum</p> Signup and view all the answers

    How are radiometric resolutions expressed in images?

    <p>In terms of the brightness values or digital numbers (DN)</p> Signup and view all the answers

    What determines the temporal resolution in remote sensing?

    <p>The frequency of obtaining images over the same area</p> Signup and view all the answers

    What is essential for remote sensing applications covering small areas?

    <p>High positional and feature accuracies</p> Signup and view all the answers

    How is feature accuracy influenced in remote sensing analysis?

    <p>By spatial, spectral, radiometric, and temporal resolutions</p> Signup and view all the answers

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