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Use Of Thermal-Inertia Properties For Material Identification

A knowledge of the thermal inertia of the Earth's surface can be used in geologic mapping as a complement to surface reflectance data as provided by Landsat. Thermal inertia, a body property, cannot be determined directly but can be inferred from radiation temperature measurements made at various times in the diurnal heating cycle, combined with a model of the surface heating processes. We have developed such a model and applied it along with temperature measurements made in the field and from satellite to determine thermal properties of surface materials. An example from a test site in western Nevada is used to illustrate the utility of this technique.