Comments on the use of the Vegetation Health Index over Mongolia

A. Karnieli, M. Bayasgalan, Y. Bayarjargal, N. Agam, S. Khudulmur, C. J. Tucker

Research output: Contribution to journalArticlepeer-review

105 Scopus citations

Abstract

The Vegetation Health index (VHI) is based on a combination of products extracted from vegetation signals, namely the Normalized Difference Vegetation Index (NDVI) and from the brightness temperatures, both derived from the NOAA Advanced Very High Resolution Radiometer (AVHRR) sensor. VH users rely on a strong inverse correlation between NDVI and land surface temperature, since increasing land temperatures are assumed to act negatively on vegetation vigour and consequently to cause stress. This Letter explores this hypothesis with data from Mongolia incorporating information from six different ecosystems. It was found that the northern ecosystems are characterized by positive correlations, implying that rising temperature favourably influences vegetation activity. It is concluded that the VHI should be used with caution, especially in high latitude regions.

Original languageEnglish
Pages (from-to)2017-2024
Number of pages8
JournalInternational Journal of Remote Sensing
Volume27
Issue number10
DOIs
StatePublished - 1 Jan 2006

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