Derivative Analysis of AVIRIS Data for Crop Stress Detection


Low-altitude Airborne Visible/Infirared Imaging Spectrometer (AVIRIS) hyperspectral imagery of a cornfield in Nebraska was used to determine whether derivative analysis methods provided enhanced plant stress detection compared with narrow-band ratios. The field was divided into 20 plots representing four replicates each of five nitrogen (N) fertilization treatments that ranged from 0 to 200 kg Who in 50 kg/ha increments. The imagery yielded a 3 m ground pixel size for 224 spectral bands. Derivative analysis provided no advantage in stress detection compared with the performance of narrow-band ratio indices derived from the literature. This result was attributed to a high leaf area index at the time of the overflight (LAI of approximately 5 to 6) and the high signal-to-noise character of the narrow AVIRIS bands

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