Remote Sensing Data Interpretation of FCC Bands on 14th June 2000
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Questions and Answers

What is the main difference between dry snow and wet snow?

  • Dry snow melts faster than wet snow.
  • Dry snow contains only ice particles, while wet snow contains ice particles and free liquid water. (correct)
  • Wet snow has a higher dielectric constant than dry snow.
  • Wet snow has a lower density compared to dry snow.
  • What is the typical range of snow densities for fresh or new snow?

  • 100-150 kg/m3 (correct)
  • 50-100 kg/m3
  • 200-600 kg/m3
  • 500-700 kg/m3
  • How does snow density change with the age of the snowpack?

  • Snow density decreases with the age of the snowpack due to increased air content.
  • There is no change in snow density with the age of the snowpack.
  • Snow density remains constant regardless of the age of the snowpack.
  • Snow density increases with the age of the snowpack due to compaction and thermal metamorphism. (correct)
  • What does SWE stand for in the context of snow?

    <p>Snow Water Equivalent</p> Signup and view all the answers

    What is the range of the dielectric constant for snow?

    <p>1.2-4.0</p> Signup and view all the answers

    How are the thermal properties of snow important in relation to melting and runoff?

    <p>The thermal properties influence phenomena such as melting and runoff.</p> Signup and view all the answers

    What happens to snow reflectance in the near-IR region as grain size (or age) increases?

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

    How does cloud cover impact the reflectance of snow?

    <p>Converts direct radiation to diffuse radiation</p> Signup and view all the answers

    What impact does depth have on the visible wavelength reflectance of snow?

    <p>Decreases it</p> Signup and view all the answers

    In which spectral range has potential been shown for snow/cloud discrimination?

    <p>1.55 - 1.75 micro m</p> Signup and view all the answers

    What happens to snow reflectance in the visible and near-infrared region compared to cloud reflectance?

    <p>Cloud has higher reflectance</p> Signup and view all the answers

    How does melting state affect the albedo of snow?

    <p>Has no direct effect</p> Signup and view all the answers

    Why are NDSI values in shadow and non-shadow regions the same?

    <p>Possibly due to reflectance from diffuse radiation in shadow areas.</p> Signup and view all the answers

    What is the purpose of using AVNIR-2 in satellite observations over glaciers?

    <p>To study the electromagnetic properties of snow in thermal infrared spectrum.</p> Signup and view all the answers

    Why does the reflectance of dry snow not exceed 1% in the thermal infrared region for grain sizes above 100 mm?

    <p>Due to high emissivity of dry snow.</p> Signup and view all the answers

    What range does the emissivity of dry snow typically fall within in the thermal infrared region?

    <p>0.965 to 0.995</p> Signup and view all the answers

    Why is a stepwise method required to estimate the emissivity of snow over a spectral region of interest?

    <p>Because direct measurement of emissivity is not feasible.</p> Signup and view all the answers

    What does ε represent in the context of the text?

    <p>Ratio of emittance of a blackbody to that of a sample at the same temperature.</p> Signup and view all the answers

    Why is the reflectance of snow in the SWIR band very low?

    <p>Ice has a high absorptive coefficient in the SWIR band</p> Signup and view all the answers

    What characteristic of snow makes automated snow cover mapping difficult during winter?

    <p>Presence of mountain shadows</p> Signup and view all the answers

    Why are water clouds and ice clouds more strongly reflecting than snow in the SWIR region?

    <p>Water is less absorptive than ice in the SWIR region</p> Signup and view all the answers

    How can the problem of automated snow cover mapping in snow-covered regions be partially solved?

    <p>By using the Normalized Difference Snow Index (NDSI)</p> Signup and view all the answers

    What advantage does utilizing middle infrared have for discriminating between snow and cloud?

    <p>It enhances snow reflectance in the SWIR region</p> Signup and view all the answers

    Why is NDSI useful for snow-cloud discrimination?

    <p>It compares SWIR Reflectance with visible reflectance</p> Signup and view all the answers

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