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  • Other Sources  (3)
  • NASA Technical Reports  (3)
  • INSTRUMENTATION AND PHOTOGRAPHY  (2)
  • EARTH RESOURCES AND REMOTE SENSING  (1)
  • 1990-1994  (3)
  • 1
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    Estimation of crown closure from AVIRIS data using regression analysis (1993)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Crown closure is one of the input parameters used for forest growth and yield modelling. Preliminary work by Staenz et al. indicates that imaging spectrometer data acquired with sensors such as the Airborne Visible/Infrared Imaging Spectrometer (AVIRIS) have some potential for estimating crown closure on a stand level. The objectives of this paper are: (1) to establish a relationship between AVIRIS data and the crown closure derived from aerial photography of a forested test site within the Interior Douglas Fir biogeoclimatic zone in British Columbia, Canada; (2) to investigate the impact of atmospheric effects and the forest background on the correlation between AVIRIS data and crown closure estimates; and (3) to improve this relationship using multiple regression analysis.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: JPL, Summaries of the 4th Annual JPL Airborne Geoscience Workshop. Volume 1: AVIRIS Workshop; p 169-172
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Fuzzy logic control for camera tracking system (1992)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: A concept utilizing fuzzy theory has been developed for a camera tracking system to provide support for proximity operations and traffic management around the Space Station Freedom. Fuzzy sets and fuzzy logic based reasoning are used in a control system which utilizes images from a camera and generates required pan and tilt commands to track and maintain a moving target in the camera's field of view. This control system can be implemented on a fuzzy chip to provide an intelligent sensor for autonomous operations. Capabilities of the control system can be expanded to include approach, handover to other sensors, caution and warning messages.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Fifth Annual Workshop on Space Operations Applications and Research (SOAR 1991), Volume 1; p 94-99
    Format: application/pdf
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  • 3
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    Laser Raman sensor for measurement of trace-hydrogen gas (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A new optical hydrogen sensor based on spontaneous Raman scattering of laser light has been designed and constructed for rugged field use. It provides good sensitivity, rapid response, and the inherent Raman characteristics of linearity and background gas independence of the signal. Efficient light collection and discrimination by using fast optics and a bandpass interference filter compensate for the inefficiency of the Raman-scattering process. A multipass optical cavity with a Herriott-type configuration provides intense illumination from an air-cooled CW gas laser. The observed performance is in good agreement with the theoretical signal and noise level predictions.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics (ISSN 0003-6935); 31; 831-835
    Format: text
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    NASA TECHNICAL REPORTS
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