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  • EARTH RESOURCES AND REMOTE SENSING  (2)
  • AIRCRAFT INSTRUMENTATION  (1)
  • 1980-1984  (3)
  • 1
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    Cloud particle effects on laminar flow and instrumentation for their measurement aboard a NASA LFC aircraft (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Fuel costs account now for approximately 60 percent of the direct operating costs of airlines and future commercial transport will utilize advanced technologies for saving fuel on the basis of drag reduction. Laminar flow control (LFC) represents such an advanced technology. A new laminar flow wing on a reconfigured WB-66 aircraft was tested in the X-21 flight program. The tests confirmed that extensive laminar flow could be achieved at subsonic transport cruise conditions. Factors affecting adversely the maintenance of laminar flow were found to be related to ice particles encountered during the penetration of cirrus clouds or haze. The present investigation is concerned with the effect of ice particles on LFC, taking into account the results obtained in the Leading Edge Flight Test (LEFT) being conducted by NASA. Attention is given to ice particle measurements in the LEFT program.
    Keywords: AIRCRAFT INSTRUMENTATION
    Type: AIAA PAPER 83-2734
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Study of sensor spectral responses and data processing algorithms and architectures for onboard feature identification (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A computational model of the deterministic and stochastic processes involved in remote sensing is used to study spectral feature identification techniques for real-time onboard processing of data acquired with advanced earth-resources sensors. Preliminary results indicate that: Narrow spectral responses are advantageous; signal normalization improves mean-square distance (MSD) classification accuracy but tends to degrade maximum-likelihood (MLH) classification accuracy; and MSD classification of normalized signals performs better than the computationally more complex MLH classification when imaging conditions change appreciably from those conditions during which reference data were acquired. The results also indicate that autonomous categorization of TM signals into vegetation, bare land, water, snow and clouds can be accomplished with adequate reliability for many applications over a reasonably wide range of imaging conditions. However, further analysis is required to develop computationally efficient boundary approximation algorithms for such categorization.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Technical Symposium East ''82; May 03, 1982 - May 07, 1982; Arlington, VA
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Estimation of spectral reflectance signatures from spectral radiance profiles (1984)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: This paper presents a technique for converting spectral radiance to the more fundamental quantity of interest, spectral reflectance. A full implementation of the technique requires the availability of radiative transfer software. However, a set of tables (which allows an approximate derivation of reflectance) is included herein, and covers a representative range of environmental parameter values. An error analysis is performed which gives, for an uncertainty in each of the input parameters (solar zenith angle, visibility, sensor altitude, off-nadir viewing angle, background reflectance and surface elevation), the resulting error in derived reflectance. As a demonstration of the technique, several sets of spectral radiance data from the Imperial Valley, California, are presented as spectral reflectances.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: International Symposium on Remote Sensing of Environment; May 09, 1983 - May 13, 1983; Ann Arbor, MI
    Format: text
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    NASA TECHNICAL REPORTS
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