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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Monitoring herbaceous fuel moisture content with SPOT VEGETATION time-series for fire risk prediction in savanna ecosystems
Remote Sensing of Environment, Volume 108, No. 4, Year 2007
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Description
This paper evaluated the capacity of SPOT VEGETATION time-series to monitor herbaceous fuel moisture content (FMC) in order to improve fire risk assessment in the savanna ecosystem of Kruger National Park in South Africa. In situ herbaceous FMC data were used to assess the Normalized Difference Vegetation Index (NDVI), Normalized Difference Water Index (NDWI), Vegetation Dryness Index (VDI), Improved VDI (IVDI), and Accumulated Relative NDVI Decrement (ARND) during the dry season. The effect of increasing amounts of dead vegetation on the monitoring capacity of derived indices was studied by sampling mixed live and dead FMC. The IVDI was proposed as an improvement of the VDI to monitor herbaceous FMC during the dry season. The IVDI is derived by replacing NDVI with the integrated Relative Vegetation Index (iRVI), as an approximation of yearly herbaceous biomass, when analyzing the 2-dimensional space with NDWI. It was shown that the iRVI offered more information than the NDVI in combination with NDWI to monitor FMC. The VDI and IVDI exhibited a significant relation to FMC with R2 of 0.25 and 0.73, respectively. The NDWI, however, correlated best with FMC (R2 = 0.75), while the correlation of ARND and FMC was weaker (R2 = 0.60) than that found for NDVI, NDWI, and IVDI. The use of in situ herbaceous FMC consequently indicated that NDWI is appropriate as spatio-temporal information source of herbaceous FMC variation which can be used to optimize fire risk and behavior assessment for fire management in savanna ecosystems. © 2007 Elsevier Inc. All rights reserved.
Authors & Co-Authors
Verbesselt, Jan
Belgium, Leuven
Ku Leuven
Somers, Ben
Belgium, Leuven
Ku Leuven
Lhermitte, Stef
Belgium, Leuven
Ku Leuven
Jonckheere, Inge G.C.
Belgium, Leuven
Ku Leuven
van Aardt, Jan Andreas N.
South Africa, Johannesburg
Csir Natural Resources and the Environment Mining
Coppin, Pol R.
Belgium, Leuven
Ku Leuven
Statistics
Citations: 76
Authors: 6
Affiliations: 2
Identifiers
Doi:
10.1016/j.rse.2006.11.019
ISSN:
00344257
Research Areas
Environmental
Study Locations
South Africa