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Discriminating Crop Residues from Soil by Shortwave Infrared Reflectance

USDA-ARS, Remote Sensing and Modeling Lab., Bldg 007, Room 116, 10300 Baltimore Ave., Beltsville, MD 20705-2350

View larger version (36K): [in a new window]   Fig. 1 Reflectance spectra of corn, soybean, and wheat residues at a range of relative water contents (RWC) from oven dry to water saturated

View larger version (49K): [in a new window]   Fig. 2 Reflectance spectra of five soils at a range of relative water contents (RWC) from oven dry to water saturated

View larger version (29K): [in a new window]   Fig. 3 Reflectance of Othello soil and corn residues in selected wavelength bands as a function of the relative water content (RWC). TM3 = 630 to 690 nm; TM4 = 760 to 900 nm; TM5 = 1550 to 1750 nm; and TM7 = 2080 to 2350 nm

View larger version (25K): [in a new window]   Fig. 4 Reflectance of crop residues and soils in a visible (TM3, 630–690 nm) and near-infrared (TM4, 760–900 nm) band. The regression line was developed using all of the soil samples. RMSE is the root mean square error

View larger version (27K): [in a new window]   Fig. 5 Reflectance of crop residues and soils in two shortwave infrared bands (TM5, 1550–1750 nm; TM7, 2080–2350 nm). The regression line was developed using all of the soil samples. RMSE is the root mean square error

View larger version (30K): [in a new window]   Fig. 6 Cellulose absorption index (CAI) of crop residues and soils plotted as function of the relative water content (RWC). The dashed line is at . All soils are located below the line, and all crop residues are located above the line

View larger version (39K): [in a new window]   Fig. 7 Reflectance of corn, soybean, and wheat crop residues at 2019 nm plotted as function of the relative water content (RWC). RMSE is the root mean square error

View larger version (21K): [in a new window]   Fig. 8 Expected changes in the cellulose absorption index (CAI) for mixed scenes of crop residue and soil as a function of the relative water content (RWC). The fraction of residue cover ranged from 0 (100% Othello soil) to 1.0 (100% corn residue). Arrows indicate the