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Tree canopy radiance measurement systemA system is described for obtaining both an estimate of the spatial mean bidirectional reflectance factor (BRF) for a tree canopy (displaying a horizontally heterogeneous foliage distribution) and the statistical significance of that estimate. The system includes a manlift supporting a horizontal beam 7 m long on which are mounted four radiometers. These radiometers may be pointed, and radiance data acquired, in any of 11 view directions in the principal plane of the sun. A total of 80 data points, acquired in 3 min, were used to estimate the BRF of a walnut orchard 5 m tall and detect true differences of 12 percent of the mean approximately 90 percent of the time.
Document ID
19900028844
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Caldwell, William
(NASA Ames Research Center Moffett Field, CA, United States)
Vanderbilt, V. C.
(TGS Technology, Inc. Moffett Field, CA, United States)
Date Acquired
August 14, 2013
Publication Date
November 1, 1989
Publication Information
Publication: Optical Engineering
Volume: 28
ISSN: 0091-3286
Subject Category
Instrumentation And Photography
Accession Number
90A15899
Distribution Limits
Public
Copyright
Other

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