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

50 Scopus citations

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

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

Fingerprint Dive into the research topics of 'Satellite monitoring of vegetation dynamics: Sensitivity enhancement by the wide dynamic range vegetation index'. Together they form a unique fingerprint.

  • Cite this