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Remote Sensing the Spatial Distribution of Crop Residues

USDA-ARS, Hydrol. and Remote Sens. Lab., Bldg. 007, Rm. 104, 10300 Baltimore Ave., Beltsville, MD 20705-2350 USA

View larger version (43K): [in a new window]   Fig. 1. Examples of field spectra for green vegetation, soil, and corn residue. Locations of Landsat-7 TM, ASTER, and CAI bands are shown.

View larger version (30K): [in a new window]   Fig. 2. Fraction of (A) green vegetation cover and (B) crop residue cover as a function of NDVI (n = 211). Squares indicate fraction of green vegetation cover (fG) > 0.3.

View larger version (49K): [in a new window]   Fig. 3. Fraction of crop residue cover as a function of four Landsat TM spectral indices—(A) NDTI, (B) NDI5, (C) NDI7, and (D) NDSVI. Data with fractions of green vegetation cover (fG) > 0.3 were excluded from the regressions.

View larger version (39K): [in a new window]   Fig. 4. Fraction of crop residue cover as a function of two spectral indices—(A) CAI and (B) LCA. Data with fractions of green vegetation cover (fG) > 0.3 were excluded from the regressions.

View larger version (30K): [in a new window]   Fig. 5. Spectral indices (CAI and LCA) plotted as a function of NDVI for the ground-based ASD data (n = 211). The two vertical dashed lines indicate 0 and 0.3 fractions of green vegetation cover (fG). The two horizontal lines represent 0.15 and 0.30 fractions of crop residue cover (fR).

View larger version (125K): [in a new window]   Fig. 6. (A) Color composite AVIRIS image with field boundaries outlined in black. Bands centered at 549, 646, and 827 nm were assigned blue, green, and red, respectively, in the image. (B) Tillage intensity classification of AVIRIS image using CAI and NDVI. Field boundaries are outlined in black.

View larger version (36K): [in a new window]   Fig. 7. AVIRIS spectra for six land cover types. The cellulose absorption feature (-OH) near 2100 nm is evident in B, C, and D (in increasing prominence) but not in other spectra. The two spectra represent the variability within each cover type.

View larger version (30K): [in a new window]   Fig. 8. Mean CAI vs. NDVI for 99 regions of interest in the AVIRIS image. Symbols refer to observed classes: C = conservation till, R = reduced till, T = intensive till, Y = yellow vegetation, G = green vegetation, M = mowed vegetation, and N = nonagricultural.