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Directional and temporal variability of the APAR/VI relationships - The case of a sunflower canopyDetailed biomass and structure measurements as well as photosynthetically active radiation (PAR) balance and bidirectional and polarized reflectances in various wavebands from 450 nm to 1750 nm have been conducted over a sunflower canopy in France. Preliminary results show that the vegetation indices (NDVI or TSAVI) computed from the red and near-infrared reflectances exhibit strong directional and temporal (variation with the sun zenith angle) features. The relationship between the vegetation indices and the PAR fraction absorbed or intercepted by the canopy is likely to vary greatly with these factors.
Document ID
19930063958
Document Type
Conference Paper
Authors
Baret, F. (INRA Montfavet, France)
Vanderbilt, V. C. (NASA Ames Research Center Moffett Field, CA, United States)
Rondeaux, G. (NASA Ames Research Center Moffett Field, CA, United States)
Pettigrew, R. E. (NASA Ames Research Center Moffett Field, CA, United States)
Hanocq, J. F. (INRA Montfavet, France)
Biehl, L. L. (Purdue Univ. West Lafayette, IN, United States)
Sarrouy, C. (INRA Montfavet, France)
Daughtry, C. S. T. (USDA, Remote Sensing Lab. Beltsville, MD, United States)
Steven, M. D. (Nottingham Univ. United Kingdom)
Sarto, A. W. (NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1992
Publication Information
Publication: In: IGARSS '92; Proceedings of the 12th Annual International Geoscience and Remote Sensing Symposium, Houston, TX, May 26-29, 1992. Vol. 2 (A93-47551 20-43)
Subject Category
EARTH RESOURCES AND REMOTE SENSING
Distribution Limits
Public
Copyright
Other

Related Records

IDRelationTitle19930063554Analytic PrimaryIGARSS '92; Proceedings of the 12th Annual International Geoscience and Remote Sensing Symposium, Houston, TX, May 26-29, 1992. Vols. 1 & 2