Satellite monitoring of vegetation dynamics: Sensitivity enhancement by the wide dynamic range vegetation index

Andrés Vina, Geoffrey M. Henebry, Anatoly A. Gitelson

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

Synoptic monitoring of vegetation dynamics relies on satellite observations of the distinctive spectral contrast between red and near infrared reflectance that photosynthetically active green vegetation exhibits. It has long been recognized that the Normalized Difference Vegetation Index (NDVI) suffers a rapid decrease of sensitivity at moderate-to-high densities of photosynthetic green biomass. This decrease can conceal detection of vegetation change in croplands, woodlands, and productive grasslands. We applied a recent, straightforward modification of the NDVI, the Wide Dynamic Range Vegetation Index (WDRVI), to a standard AVHRR dataset to assess its sensitivity to variability within ecoregions and across years, relative to NDVI. In productive ecoregions, the sensitivity increased within a single year by up to 47% and the sensitivity to interannual variability increased by up to 100%. The WDRVI exhibited no increase in sensitivity in ecoregions with sparse vegetation. These findings have significant implications for diverse applications of vegetation monitoring products.

Original languageEnglish (US)
Pages (from-to)L04503 1-4
JournalGeophysical Research Letters
Volume31
Issue number4
DOIs
StatePublished - Feb 28 2004

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vegetation dynamics
vegetation index
vegetation
dynamic range
ecoregion
NDVI
augmentation
sensitivity
normalized difference vegetation index
monitoring
AVHRR
woodland
reflectance
near infrared
farmlands
grassland
grasslands
Advanced Very High Resolution Radiometer
satellite observation
biomass

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

Cite this

Satellite monitoring of vegetation dynamics : Sensitivity enhancement by the wide dynamic range vegetation index. / Vina, Andrés; Henebry, Geoffrey M.; Gitelson, Anatoly A.

In: Geophysical Research Letters, Vol. 31, No. 4, 28.02.2004, p. L04503 1-4.

Research output: Contribution to journalArticle

Vina, Andrés ; Henebry, Geoffrey M. ; Gitelson, Anatoly A. / Satellite monitoring of vegetation dynamics : Sensitivity enhancement by the wide dynamic range vegetation index. In: Geophysical Research Letters. 2004 ; Vol. 31, No. 4. pp. L04503 1-4.
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