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Normalization of multidirectional red and NIR reflectances with the SAVIDirectional reflectance measurements were made over a semi-desert gramma grassland at various times of the growing season. View angle measurements from +40 to -40 degrees were made at various solar zenith angles and soil moisture conditions. The sensitivity of the Normalized Difference Vegetation Index (NDVI) and the Soil Adjusted Vegetation Index (SAVI) to bidirectional measurements was assessed for purposes of improving remote temporal monitoring of vegetation dynamics. The SAVI view angle response was found to be symmetric about nadir while the NDVI response was strongly anisotropic. This enabled the view angle behavior of the SAVI to be normalized with a cosine function. In contrast to the NDVI, the SAVI was able to minimize soil moisture and shadow influences for all measurement conditions.
Document ID
19920067044
Document Type
Reprint (Version printed in journal)
Authors
Huete, A. R. (NASA Headquarters Washington, DC United States)
Hua, G. (NASA Headquarters Washington, DC United States)
Qi, J. (NASA Headquarters Washington, DC United States)
Chehbouni, A. (NASA Headquarters Washington, DC United States)
Van Leeuwen, W. J. D. (Arizona, University Tucson, United States)
Date Acquired
August 15, 2013
Publication Date
September 1, 1992
Publication Information
Publication: Remote Sensing of Environment
Volume: 41
Issue: 3-Feb
ISSN: 0034-4257
Subject Category
EARTH RESOURCES AND REMOTE SENSING
Funding Number(s)
CONTRACT_GRANT: NAGW-1949
CONTRACT_GRANT: NAS5-30789
Distribution Limits
Public
Copyright
Other