1 November 1989 Tree Canopy Radiance Measurement System
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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.
William Caldwell, William Caldwell, V. C. Vanderbilt, V. C. Vanderbilt, } "Tree Canopy Radiance Measurement System," Optical Engineering 28(11), 281227 (1 November 1989). https://doi.org/10.1117/12.7977124 . Submission:

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