CSI: papers published: Soil directional reflectance for dry and saturated conditions

Soil samples for a) quartz sand, b) masonry sand, c) Ithaca soil, all at the same scale.

Soil directional reflectance in the principal plane with varied illumination angle under dry and saturated conditions

by Tian, Jia and CSI member Philpot, William D. OPTICS EXPRESS, 26 (18):23883-23897; 10.1364/OE.26.023883 SEP 3 2018 (email: philpot@cornell.edu)
The team monitored the change in directional (biconical) spectral reflectance for three soil samples under air dry and saturated conditions in the laboratory using three discrete illumination angles. The soil samples represent a variety of soil properties and the observations illustrate the darkening, changes in spectral distribution, and flattening of the directional properties of saturated soil relative to dry soil.
(C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement Reprint Address: Tian, J (reprint author), Cornell Univ, Dept Civil & Environm Engn, Ithaca, NY 14853 USA.

William Douglas Philpot, Civil & Environmental Eng.