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Sky Luminances and the Directional Luminous Reflectances of Objects and Backgrounds for a Moderately High Sun

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Abstract

Sky luminance distributions for the upper and lower sky at ground level, 1.52 km and 6.10 km are presented for a clear day with a medium high sun. The directional luminous reflectances of a variety of natural terrains and man-made surfaces measured under a clear sky with a moderately high sun are also presented. These data are applicable for use in visibility calculations and supplement the data presented in an earlier article [ S. Q. Duntley, J. I. Gordon, John H. Taylor, C. T. White, A. R. Boileau, J. E. Tyler, R. W. Austin, and J. L. Harris, Appl. Opt. 3, 549 ( 1964)].

© 1966 Optical Society of America

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