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Moisture Effects on Soil Reflectance

Dep. of Geological Sciences and Environmental Studies Program, Univ. of Colorado, Boulder, CO 80309

View larger version (55K): [in a new window]   Fig. 1. Laboratory spectra of four soils at different volumetric water contents (). Values of in percentages by volume are indicated next to select spectra.

View larger version (24K): [in a new window]   Fig. 2. Changes in reflectance because of soil moisture for four different soils at (a) 0.6 µm, (b) 1.2 µm, and (c) 2.2 µm, along with best-fit exponential model.

View larger version (30K): [in a new window]   Fig. 3. Best-fit coefficients for Aridisol (solid line), Andisol (dotted), Mollisol (dashed), and Entisol (dash-dotted) in a model of exponential decrease in soil reflectance with moisture, R = Rsat + (Rdry - Rsat) x exp(-c). (a) Rsat; (b) Rdry; (c) c; (d) Same as in (c) but using degree of saturation, s, in place of .

View larger version (17K): [in a new window]   Fig. 4. (a) Continuum-removed absorption band depth (D) at 2200 nm for the Aridisol at different volumetric water contents. (b) same as in (a) but for the Entisol.

View larger version (19K): [in a new window]   Fig. 5. Ratio (f) of saturated to dry reflectance for four soils.

View larger version (29K): [in a new window]   Fig. 6. Predicted values of s from 1000 iterations of Eq. [6] for an Entisol spectra. Values of c and f were randomly selected for each model run based on measured variability. Gray lines indicate one and two standard deviations () from the mean value (67 and 95% confidence intervals, respectively), while the horizontal dashed line shows true s for sample (0.325).