ENS 243: Vegetation Indices & Spectral Signatures
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Questions and Answers

What do spectral signatures primarily represent?

  • The topographic features of an object
  • The spatial characteristics of an object
  • The spectral response of an object (correct)
  • The thermal properties of an object
  • What is the primary factor affecting an object's spectral reflectance?

  • Solar azimuth
  • Nature of the target
  • Solar elevation angle
  • All of the above (correct)
  • What is the characteristic spectral reflectance pattern of strong vegetation?

  • A flat, uniform reflectance pattern
  • A gradual increase in reflectance with wavelength
  • A gradual decrease in reflectance with wavelength
  • A 'peak and valley' structure (correct)
  • What is the term for the ratio between the irradiance and the radiant emittance of an object?

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

    What is the primary cause of the valleys in the visible portion of the spectral reflectance curve for vegetation?

    <p>Pigments in plant leaves</p> Signup and view all the answers

    At what wavelengths do inclines in reflectance occur in the spectral reflectance curve for vegetation?

    <p>0.65µm, 1.4µm, and 1.9µm</p> Signup and view all the answers

    What is the primary reason for the low reflectance of vegetation in the red and blue regions of the electromagnetic spectrum?

    <p>Chlorophyll's strong absorption of blue and red energy</p> Signup and view all the answers

    Which vegetation index is sensitive to changes in vegetation canopy water content and indicates water stress?

    <p>Land Surface Water Index (LSWI)</p> Signup and view all the answers

    What is the primary advantage of atmospherically corrected vegetation indices?

    <p>They define true surface reflectance by removing atmospheric effects</p> Signup and view all the answers

    Which type of vegetation index is developed from simple band ratios?

    <p>Simple, Intrinsic Indices</p> Signup and view all the answers

    What is the primary purpose of the Vegetation Condition Index (VCI)?

    <p>To compare the current NDVI to the range of values observed in the same period in previous years</p> Signup and view all the answers

    Which vegetation index minimizes the influence of soil brightness?

    <p>Soil Adjusted Vegetation Index (SAVI)</p> Signup and view all the answers

    What is the primary application of the Vegetation Index formula (B8-B4)/(B8+B4) in MODIS data analysis?

    <p>To quantify the amount of vegetation</p> Signup and view all the answers

    Which Sentinel band combination uses the combination of NIR, red, and green bands?

    <p>Color Infrared</p> Signup and view all the answers

    What is the primary purpose of the Agriculture band combination in MODIS data analysis?

    <p>To monitor the health of crops</p> Signup and view all the answers

    What is the main characteristic of healthy vegetation in the Color Infrared band combination?

    <p>Appears red due to high near-infrared reflection</p> Signup and view all the answers

    What is the primary function of the Short-Wave Infrared band combination in MODIS data analysis?

    <p>To emphasize healthy and unhealthy vegetation</p> Signup and view all the answers

    What is the color assigned to urban areas in the Color Infrared band combination?

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

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