Overcast sky luminances and directional luminous reflectances of objects and backgrounds under overcast skies.
Two sky luminance distributions are given for overcast sky above snow-covered terrain, and directional luminous reflectance data are presented which were obtained under these skies. Luminous reflectances computed from Krinov spectral reflectance data for a variety of natural terrains measured under overcast are also included.
Gordon
J I
JI
Visibility Laboratory, Scripps Institutionof Oceanography, University of California, San Diego,California 92152, USA.
Church
P V
PV