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 μm wavelengths under both copolarized and cross-polarized conditions. Calibration was performed for each measurement using a Labsphere Infra-gold 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 carbon content. The selected samples 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. These results can be used to improve the accuracy of downwardlooking DIAL pollution sensors, and also develop new techniques for soil classification.
|Number of pages
|IEEE Transactions on Geoscience and Remote Sensing
|Published - May 1992
ASJC Scopus subject areas
- Electrical and Electronic Engineering
- General Earth and Planetary Sciences