Abstract
Active mid-infrared laser reflectance characteristics of 18 different benchmark soil samples were measured at different angles of incidence at 9.283, 9.569, 10.247, and 10.633 mu m wavelengths under both copolarized and cross-copolarized conditions. Calibration was performed for each measurement using a Labsphere Infra-fold Diffuse Reflectance Standard of 94% reflectance. One hundred independent samples were averaged for each measurement to yield a mean reflectance value. The soil samples were characterized in terms of the soil taxonomy, mineralogy, geographic location, soil texture, and organic content and represented wide variability in soil properties. The data thus obtained are presented in graphical form, and the effect of soil mineralogy on the spectral features is investigated. A physically based empirical model is also presented to predict the angular dependence of copolarized backscatter. >
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