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  • 1
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    Studies of high latitude current systems using MAGSAT vector data (1981)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The magnetic disturbance fields caused by global external current systems are considered with particular emphasis on improving the understanding of the physical processes which control high latitude current systems. Following processing the MAGSAT data were routinely plotted in the Universal Time (UT) format as well as in a polar plot format. The H'D'U' coordinate system, was adopted as the standard for representing the MAGSAT residual magnetic field vectors. A data file was generated and the TPOLAR computer code was developed to determine from the orbital elements, the time, latitude, and MLT of the extremum latitude of each transpolar segment of orbit. The precision of the vector data set from MAGSAT prompted an extended exploratory phase for data analysis procedures, modeling techniques and phenomenology.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E82-10188 , NASA-CR-168616 , NAS 1.26:168616 , PR-3
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Study and simulation results for video landmark acquisition and tracking technology (Vilat-2) (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The results of several investigations and hardware developments which supported new technology for Earth feature recognition and classification are described. Data analysis techniques and procedures were developed for processing the Feature Identification and Location Experiment (FILE) data. This experiment was flown in November 1981, on the second Shuttle flight and a second instrument, designed for aircraft flights, was flown over the United States in 1981. Ground tests were performed to provide the basis for designing a more advanced version (four spectral bands) of the FILE which would be capable of classifying clouds and snow (and possibly ice) as distinct features, in addition to the features classified in the Shuttle experiment (two spectral bands). The Shuttle instrument classifies water, bare land, vegetation, and clouds/snow/ice (grouped).
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA-CR-166066 , NAS 1.26:166066
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Studies of high latitude current systems using Magsat vector data (1980)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Disturbance fields caused by global external current systems are analyzed in order to gain an improved understanding of the phydical processes which control high latitude current systems and to increase the confidence level in the identification of internal field levels. The basic approach is to: (1) categorize the vector data by those physical parameters important for investigation of external current systems; (2) map the disturbances for appropriate conditions; (3) model the currents which might cause the mapped disturbances; and (4) correlate results with data from other sources. It is concluded that the Magsat data set appears to have remarkably high precision and quality and should permit major advances to be made in modeling current distribution at high latitudes in the ionosphere and magnetosphere.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E81-10085 , NASA-CR-163785 , PR-1
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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