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  • 1
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    The Characterization of Surface Variegation Effects on Remote Sensing (1985)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Improvements in remote sensing capabilities hinge very directly upon attaining an understanding of the physical processes contributing to the measurements. In order to devise new measurement strategies and to learn better techniques for processing remotely gathered data, it is necessary to understand and to characterize the complex radiative interactions of the atmosphere-surface system. In particular, it is important to understand the role of atmospheric structure, ground reflectance inhomogeneity and ground bidirectional reflectance type. The goals, then, are to model, analyze, and parameterize the observable effects of three dimensional atmospheric structure and composition and two dimensional variations in ground albedo and bidirectional reflectance. To achieve these goals, a Monte Carlo radiative transfer code is employed to model and analyze the effects of many of the complications which are present in nature.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA. Goddard Space Flight Center Fundamental Remote Sensing Sci. Res. Program; p 107-113
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Development of laminar flow control wing surface porous structure (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: It was concluded that the chordwise air collection method, which actually combines chordwise and spanwise air collection, is the best of the designs conceived up to this time for full chord laminar flow control (LFC). Its shallower ducting improved structural efficiency of the main wing box resulting in a reduction in wing weight, and it provided continuous support of the chordwise panel joints, better matching of suction and clearing airflow requirements, and simplified duct to suction source minifolding. Laminar flow control on both the upper and lower surfaces was previously reduced to LFC suction on the upper surface only, back to 85 percent chord. The study concludes that, in addition to reduced wing area and other practical advantages, this system would be lighter because of the increase in effective structural wing thickness.
    Keywords: AERONAUTICS (GENERAL)
    Type: NASA-CR-172424 , NAS 1.26:172424
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Cloud shadow effects on remote sensing (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: On relatively clear days, the shadow cast by an isolated, optically dense cloud produces an effect which is similar in extent and magnitude to the adjacency effects associated with high-contrast ground albedo boundaries. A Monte Carlo radiative transfer model has been used to examine the intensity and its components, comparing the cloud shadow case with that for a Lambertian albedo boundary. Although the behavior of the total intensity is nearly the same for both cases, the behaviors of the intensity components differ significantly.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: IEEE Transactions on Geoscience and Remote Sensing (ISSN 0196-2892); GE-23; 634-639
    Format: text
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    NASA TECHNICAL REPORTS
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