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  • 1
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    The Mars observer camera (1987)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: A camera designed to operate under the extreme constraints of the Mars Observer Mission was selected by NASA in April, 1986. Contingent upon final confirmation in mid-November, the Mars Observer Camera (MOC) will begin acquiring images of the surface and atmosphere of Mars in September-October 1991. The MOC incorporates both a wide angle system for low resolution global monitoring and intermediate resolution regional targeting, and a narrow angle system for high resolution selective surveys. Camera electronics provide control of image clocking and on-board, internal editing and buffering to match whatever spacecraft data system capabilities are allocated to the experiment. The objectives of the MOC experiment follow.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1986; p 548-550
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Photometry of rough planetary surfaces - The role of multiple scattering (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Topographic features affect the scattering properties of planetary surfaces by casting shadows and altering the local incidence and emission angles. Measurements of this phenomenon were obtained on the Cornell goniometer for both high and low albedo surfaces. For the low albedo surface, the decrease in reflected radiation due to topography increases sharply with increasing phase angle, whereas for the high albedo sample the effects are approximately constant between phase angles of 30 and 70 deg. The observations are in good agreement with a theoretical model in the case of the dark surface. However, for the high albedo surface the model overestimates the effects by a factor of 2, since it does not include the partial illumination of shadows by multiple scattering. For both high and low albedo surfaces, the effects of topography do not become significant until a phase angle of 30-40 deg.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Icarus (ISSN 0019-1035); 64; 320-328
    Format: text
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    NASA TECHNICAL REPORTS
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