Determining experimentally induced variation in coniferous canopy chemistry with Airborne Imaging Spectrometer dataExperimental treatments in a Douglas-fir forest in NE New Mexico were carried out to determine whether differences in forest canopy chemistry could be detected using data from the Airborne Imaging Spectrometer (AIS-2). Experimental treatments consisted of nitrogen fertilizer additions, sawdust additions, and control plots. After AIS-2 data were collected, the digital number of a given pixel was extracted from each channel, yielding 128 values that were used to form a spectrum. Four spectra were extracted from each treatment plot. Multiple stepwise linear regressions between first and second difference transformations of AIS-2 spectra and the canopy characteristics of biomass, nitrogen concentration, and nitrogen content were performed. The results showed a coefficient of multiple determination of 0.71 between first-difference AIS-2 spectra and measured nitrogen concentration in foliage, indicating that it may be possible to predict nitrogen concentration in Douglas fir using AIS-2 spectra.
Document ID
19910031241
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Swanberg, N. A. (NASA Ames Research Center; TGS Technology, Inc. Moffett Field, CA, United States)
Matson, P. A. (NASA Ames Research Center Moffett Field, CA, United States)