Remote Sensing Quiz
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Questions and Answers

What does incident energy consist of?

  • Reflected, absorbed, and transmitted energy (correct)
  • Reflected energy only
  • Absorbed energy only
  • Transmitted energy only

    • How is the normalized vegetation index (NDVI) calculated?

  • NDVI = (NIR - Red) / (NIR + Red) (correct)
  • NDVI = NIR - Red
  • NDVI = NIR + Red
  • NDVI = (NIR + Red) / (NIR - Red)

    • What determines the level of detail visible in an image obtained from remote sensing technology?

  • Spectral reflectance
  • Spatial resolution (correct)
  • Digital number (DN)
  • Incident energy

    • What range of values does 8-bit digital imagery utilize to represent energy values?

    <p>0 to 255</p> Signup and view all the answers

    What percentage of total energy is represented by reflection if the portion p equals 50%?

    <p>50%</p> Signup and view all the answers

    What is the primary role of thermal infrared (TIR) in studying the atmosphere?

    <p>Measuring heat sources and radiant heat energy</p> Signup and view all the answers

    Which type of scattering is responsible for the blue color of the sky during the day?

    <p>Rayleigh scattering</p> Signup and view all the answers

    What defines atmospheric windows in the context of electromagnetic energy?

    <p>Wavelengths that pass through the atmosphere without significant absorption</p> Signup and view all the answers

    How does absorption relate to the color of objects, specifically a green shirt?

    <p>It absorbs all colors except green, which is reflected</p> Signup and view all the answers

    What is incident energy regarding its interaction with an object?

    <p>The total energy that interacts with an object per wavelength</p> Signup and view all the answers

    Which infrared band is often utilized in satellite imagery and color infrared photography?

    <p>0.7 - 1.3 μm</p> Signup and view all the answers

    What type of scattering occurs when particles causing scattering are significantly smaller than the wavelengths involved?

    <p>Rayleigh scattering</p> Signup and view all the answers

    Which infrared wavelength range is primarily used to measure heat sources and radiant heat energy?

    <p>3.0 - 14.0 μm</p> Signup and view all the answers

    Which of the following infrared bands is associated with the study of water content in plants?

    <p>1.3 - 3.0 μm</p> Signup and view all the answers

    Which atmospheric window range experiences minimal absorption by the Earth's atmosphere?

    <p>0.4 - 0.7 μm</p> Signup and view all the answers

    What primarily distinguishes active remote sensing from passive remote sensing?

    <p>Active remote sensing generates its own energy.</p> Signup and view all the answers

    Which of the following is a correct statement about the speed of light?

    <p>It is a constant speed in a vacuum.</p> Signup and view all the answers

    What wavelength range corresponds to visible light as detected by human eyes?

    <p>0.4 to 0.7 micrometers</p> Signup and view all the answers

    How long does it take sunlight to reach Earth from the sun?

    <p>Approximately 8.3 minutes</p> Signup and view all the answers

    Which devices would be considered examples of active remote sensing?

    <p>Radar and Lidar systems</p> Signup and view all the answers

    What does the equation 'Frequency x Wavelength = Speed of light' illustrate?

    <p>A fundamental relationship in electromagnetic energy.</p> Signup and view all the answers

    What is a micrometer a measurement of?

    <p>The thickness of a bacterium</p> Signup and view all the answers

    Why are bees able to see ultraviolet light?

    <p>Ultraviolet light is within their visible spectrum range.</p> Signup and view all the answers

    What does spatial resolution indicate in image analysis?

    <p>The size of the area on the ground represented by one pixel.</p> Signup and view all the answers

    What is the range of digital numbers (DN) in 8-bit energy-digital imagery?

    <p>0 to 255</p> Signup and view all the answers

    Which description accurately defines panchromatic imagery?

    <p>Black and white imagery of the entire visible spectrum.</p> Signup and view all the answers

    What is the primary characteristic of multispectral imagery?

    <p>It can sense several bands of imagery at once.</p> Signup and view all the answers

    What does a color composite image utilize to display imagery?

    <p>Three color guns representing RGB.</p> Signup and view all the answers

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