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  • EARTH RESOURCES AND REMOTE SENSING  (3)
  • SOLAR PHYSICS
  • 1980-1984  (3)
  • 1983  (3)
  • 1
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    Focusing the parabolic antenna (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The focused parabolic antenna has far field pattern characteristics in the radiating near field region. Therefore, it can provide fine resolutions in the across range dimensions. The technique of focusing the parabolic antenna is discussed and applied to a 2-1/2 foot parabolic antenna at X-band. The results of the pattern measurements at various ranges from 2.8 m to 5 m are provided.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA-CR-173304 , NAS 1.26:173304 , RSL-TM-587-1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    C-band measurements of radar backscatter from ice project summary report (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The ability to measure the radar scattering coefficient of ice with a helicopter or surface spectrometer was extended into the 4-8 GHz spectral region. The scattering coefficient was measured at Mould Bay, N.W.T., over a frequency range from 4 to 18 GHz for both summer and fall conditions. Scatter from fresh water ice in the St. Lawrence River and from numerous seasonal sea-ice types along the coast of Newfoundland were also measured. The C-band (near 5 GHz) scattering cross section for different types of ice shows poorer contrast than the scattering coefficient at higher frequencies, but better contrast than the negligible value found at L-band (1.5 GHz). At frequencies above 4 GHz the contrast in scattering coefficient between the different ice types is much less in summer than in other seasons; at most times of year the scattering is much stronger from multiyear than from other ice types, but in early summer it is actually slightly weaker than that from first year ice.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA-CR-170302 , NAS 1.26:170302 , RSL-TR-524
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    LANDSAT 4 investigations of thematic mapper and multispectral scanner applications (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Digital data analyses suggest the potential for TM data to provide improved land cover information with the mid-IR band being especially useful. Coefficients of variations for major land categories were greater for MSS data channels than for TM channels. Interpretation of black and white images of the six reflective TM bands indicates a strong interpreter preference for bands 5 and 7 for making distinctions in most of the classification categories that were addressed; however, a strong case can be made for a color composite containing visible, near-IR, and mid-IR spectral regions when distinguishing vegetation. A transformation from each red, green, blue color space into hue, intensity, and saturation space has potential for enhanced interpretability of TM color composite images. A perspective view transformation was demonstrated that could be useful for presently registered layers of spatial data in an oblique view format.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E83-10301 , NASA-CR-170373 , NAS 1.26:170373
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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