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Use of narrow-band spectra to estimate the fraction of absorbed photosynthetically active radiationA novel approach is proposed for using high-spectral resolution imagers to estimate the fraction of photosynthetically active radiation adsorbed, f(apar), by vegetated land surfaces. In comparison to approaches using broad-band vegetation indices, the proposed method appears to be relatively insensitive to the reflectance of nonphotosynthetically active material beneath the canopy, such as leaf litter or soil. The method is based on a relationship between the second derivative of the reflectance vs wavelength function for terrestrial vegetation and f(apar). The relationship can be defined by the second derivatives in either of two windows, one in the visible region centered at 0.69 micron, another in the near-infrared region centered at 0.74 micron.
Document ID
19900065534
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Hall, Forrest G.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Huemmrich, Karl F.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Goward, Samuel N.
(Maryland, University College Park, United States)
Date Acquired
August 14, 2013
Publication Date
April 1, 1990
Publication Information
Publication: Remote Sensing of Environment
Volume: 32
ISSN: 0034-4257
Subject Category
Earth Resources And Remote Sensing
Accession Number
90A52589
Distribution Limits
Public
Copyright
Other

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