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Optical Engineering

Tree Canopy Radiance Measurement System
Author(s): William Caldwell; V. C. Vanderbilt
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Paper Abstract

A 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 support-ing 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% of the mean approximately 90% of the time.

Paper Details

Date Published: 1 November 1989
PDF: 10 pages
Opt. Eng. 28(11) 281227 doi: 10.1117/12.7977124
Published in: Optical Engineering Volume 28, Issue 11
Show Author Affiliations
William Caldwell, NASA Ames Research Center (United States)
V. C. Vanderbilt, TGS Technology, Inc (United States)

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