NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Biophysical information in asymmetric and symmetric diurnal bidirectional canopy reflectanceThe authors present a theory for partitioning the information content in diurnal bidirectional reflectance measurements in order to detect differences potentially related to biophysical variables. The theory, which divides the canopy reflectance into asymmetric and symmetric functions of solar azimuth angle, attributes asymmetric variation to diurnal changes in the canopy biphysical properties. The symmetric function is attributed to the effects of sunlight interacting with a hypothetical average canopy which would display the average diurnal properties of the actual canopy. The authors analyzed radiometer data collected diurnally in the Thematic Mapper wavelength bands from two walnut canopies that received differing irrigation treatments. The reflectance of the canopies varied with sun and view angles and across seven bands in the visible, near-infrared, and middle infrared wavelength regions. Although one of the canopies was permanently water stressed and the other was stressed in mid-afternoon each day, no water stress signature was unambiguously evident in the reflectance data.
Document ID
19920033722
Document Type
Reprint (Version printed in journal)
Authors
Vanderbilt, Vern C. (NASA Ames Research Center Moffett Field, CA, United States)
Caldwell, William F. (NASA Ames Research Center Moffett Field, CA, United States)
Pettigrew, Rita E. (NASA Ames Research Center Moffett Field, CA, United States)
Ustin, Susan L. (NASA Ames Research Center Moffett Field, CA, United States)
Martens, Scott N. (NASA Ames Research Center Moffett Field, CA, United States)
Rousseau, Robert A. (California, University Davis, United States)
Berger, Kevin M. (Fujitsu Microelectronics, Inc. San Jose, CA, United States)
Ganapol, B. D. (Arizona, University Tucson, United States)
Kasischke, Eric S. (Michigan Environmental Research Institute, Ann Arbor, United States)
Clark, Jenny A. (NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
August 15, 2013
Publication Date
November 1, 1991
Publication Information
Publication: IEEE Transactions on Geoscience and Remote Sensing
Volume: 29
ISSN: 0196-2892
Subject Category
EARTH RESOURCES AND REMOTE SENSING
Distribution Limits
Public
Copyright
Other