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  • EARTH RESOURCES AND REMOTE SENSING  (2)
  • ASTROPHYSICS
  • GROUND SUPPORT SYSTEMS AND FACILITIES (SPACE)
  • 1985-1989  (2)
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Keywords
  • EARTH RESOURCES AND REMOTE SENSING  (2)
  • ASTROPHYSICS
  • GROUND SUPPORT SYSTEMS AND FACILITIES (SPACE)
  • ASTRONOMY  (1)
Years
Year
  • 1
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    Unknown
    Comparison of in situ and Landsat derived reflectance of Alaskan glaciers (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Reflectances calculated from TM data and corrected for atmospheric effects correspond with in situ measured reflectances in the nadir-viewing mode, and are shown to be related to a glacier's mass balance if measured over a period of years. A reflectance of 0.895 for a test site in the Wrangell Mountains, Alaska, was calculated from TM Band 4 (0.76 - 0.90 micron) data and corrected for atmospheric effects. This value was comparable to the in situ reflectance of 0.90 measured in the same 0.76 - 0.90 micron wavelength region. For the same site, a reflectance value of 0.79 derived from integrating over most (0.40 - 3.0 micron) of the reflective portion of the electromagnetic spectrum was quite different from the integrated reflectance of 0.95 calculated for the spectral range 0.40 - 1.0 micron. This demonstrates the importance of using the full reflective energy spectrum for calculating the albedo of snow, and for obtaining a meaningful computation of a glacier's energy and mass balance change.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Remote Sensing of Environment (ISSN 0034-4257); 28; 23-31
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Application of photogrammetry to the study of volcano-glacier interactions on Mount Wrangell, Alaska (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Most Alaskan volcanoes are glacier covered and provide excellent opportunities to study interactions between glaciers and volcanoes. The present paper is concerned with such a study, taking into account the Mt. Wrangell (4317 m) which is the northernmost active volcano (solfatara activity) on the Pacific Rim (62 deg N; 144 deg W). While the first photographs on the summit of Mt. Wrangell were published more than 75 years ago, research there began in 1953 and 1954. Satellite images reveal activity at the summit of Mt. Wrangell. However, the resolution is not sufficient for conducting important measurements regarding ice volume losses. For this reason, vertical aerial photographs of the summit were obtained, and a field trip to the summit was conducted. Aspects of photogrammetry are discussed, taking into account questions of ground control, aerial photography, topographic mapping, digital cross sections, and orthophotos.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Photogrammetric Engineering and Remote Sensing (ISSN 0099-1112); 52; 813-827
    Format: text
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    NASA TECHNICAL REPORTS
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