Mathematics – Logic
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992adspr..12..361w&link_type=abstract
Advances in Space Research, Volume 12, Issue 7, p. 361-368.
Mathematics
Logic
Scientific paper
Broad-band reflectance measurements of vegetation have had wide application in the form of indices based on the unique differential between chlorophyll absorption in the red wavelengths and structure-induced reflectance in the near infrared. However, background and atmospheric effects are irretrievably convolved in the measured signal and only partially removed through ratioing of wavebands. The numerous high resolution, contiguous spectral bands acquired by imaging spectrometers enhance the spectral separation of scene components such as shade, vegetation and soil. Further, absorption feature characteristics can be quantified through definition of inflection points, band depth, etc. Alterations in the chlorophyll absorption feature are indicative of phenological and stress-induced changes in chlorophyll activity. Research suggests that other canopy biochemical constituents, such as cellulose and lignin, influence reflectance in the shortwave infrared and can potentially be quantified using imaging spectrometry. Capability to estimate biochemical properties in terrestrial ecosystems would aid in the assessment of carbon fixation/allocation patterns, metabolic processes and nutrient availability altered by a changing environment.
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