Normalization of multidirectional red and NIR reflectances with the SAVI

A. R. Huete, G. Hua, J. Qi, A. Chehbouni, Willem van Leeuwen

Research output: Contribution to journalArticle

99 Citations (Scopus)

Abstract

Directional reflectance measurements were made over a semidesert gramma (Bouteloua spp.) grassland at various times of the growing season. Azimuthal strings of view angle measurements from + 40° to - 40° were made for 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 these bidirectional measurements was assessed for purposes of improving remote temporal monitoring of vegetation activity. The NDVI response from the grassland canopy was strongly anisotropic about nadir view angles while the SAVI response was symmetric about nadir. This occurred for all sun angles, soil moisture condition, and grass densities. This enabled variations in SAVI-view angle response to be minimized with a cosine function. It is expected that this study will aid in improving the characterization of vegetation temporal activity from Landsat TM, SPOT, AVHRR, and the Earth Observing System MODIS sensor.

Original languageEnglish (US)
Pages (from-to)143-154
Number of pages12
JournalRemote Sensing of Environment
Volume41
Issue number2-3
DOIs
StatePublished - 1992

Fingerprint

vegetation index
reflectance
nadir
Soils
NDVI
Bouteloua
Earth Observing System
soil moisture
grasslands
grassland
soil water
soil
vegetation
moderate resolution imaging spectroradiometer
zenith angle
EOS
Landsat
SPOT
AVHRR
Landsat thematic mapper

ASJC Scopus subject areas

  • Computers in Earth Sciences
  • Earth-Surface Processes
  • Environmental Science(all)
  • Management, Monitoring, Policy and Law

Cite this

Normalization of multidirectional red and NIR reflectances with the SAVI. / Huete, A. R.; Hua, G.; Qi, J.; Chehbouni, A.; van Leeuwen, Willem.

In: Remote Sensing of Environment, Vol. 41, No. 2-3, 1992, p. 143-154.

Research output: Contribution to journalArticle

Huete, A. R. ; Hua, G. ; Qi, J. ; Chehbouni, A. ; van Leeuwen, Willem. / Normalization of multidirectional red and NIR reflectances with the SAVI. In: Remote Sensing of Environment. 1992 ; Vol. 41, No. 2-3. pp. 143-154.
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