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Calculated sensitivities of several optical radiometric indices for vegetation canopiesThe present study employs a radiative transfer model for a vegetation canopy to compute several quantities used in remote sensing applications and to determine the sensitivity of these radiometric quantities to several of the important problem parameters. Attention is given to the ratio of near IR to visible reflected intensities in the nadir direction, the ratio of the fraction of incident energy reflected in the near IR to that in the visible, the normalized difference between the near IR and visible nadir-reflected intensities, and the visible intensity transmitted in a given downward direction. A realistic radiative transfer model is proposed for calculating these radiometric quantities. With these models, the sensitivity of the reflected and transmitted quantities to various canopy and illumination conditions are then determined. The sensitivity of the calculated quantities are presented as a function of the leaf area index of the canopy, and, for the reflected quantities, also as a function of the fraction of visible light absorbed in the canopy.
Document ID
19920038376
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Shultis, J. K.
(Kansas State University Manhattan, United States)
Date Acquired
August 15, 2013
Publication Date
December 1, 1991
Publication Information
Publication: Remote Sensing of Environment
Volume: 38
ISSN: 0034-4257
Subject Category
Earth Resources And Remote Sensing
Accession Number
92A21000
Funding Number(s)
CONTRACT_GRANT: NAG3-589
Distribution Limits
Public
Copyright
Other

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