Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 338973
Title Narrow band vegetation indices overcome the saturation problem in biomass estimation
Author(s) Mutanga, O.; Skidmore, A.K.
Source International Journal of Remote Sensing 25 (2004)19. - ISSN 0143-1161 - p. 3999 - 4014.
Department(s) Wildlife Ecology and Conservation
Publication type Refereed Article in a scientific journal
Publication year 2004
Keyword(s) hyperspectral brdf data - red edge position - leaf-area index - spectral reflectance - chlorophyll content - classification - canopies - grass - ndvi
Abstract Remotely sensed vegetation indices such as NDVI, computed using the red and near infrared bands have been used to estimate pasture biomass. These indices are of limited value since they saturate in dense vegetation. In this study, we evaluated the potential of narrow band vegetation indices for characterizing the biomass of Cenchrus ciliaris grass measured at high canopy density. Three indices were tested: Modified Normalized Difference Vegetation Index (MNDVI), Simple Ratio (SR) and Transformed Vegetation Index (TVI) involving all possible two band combinations between 350 nm and 2500 nm. In addition, we evaluated the potential of the red edge position in estimating biomass at full canopy cover. Results indicated that the standard NDVI involving a strong chlorophyll absorption band in the red region and a near infrared band performed poorly in estimating biomass ( R(2) = 0.26). The MNDVIs involving a combination of narrow bands in the shorter wavelengths of the red edge ( 700 - 750 nm) and longer wavelengths of the red edge ( 750 - 780 nm), yielded higher correlations with biomass ( mean R(2) = 0.77 for the highest 20 narrow band NDVIs). When the three vegetation indices were compared, SR yielded the highest correlation coefficients with biomass as compared to narrow band NDVI and TVI ( average R(2) = 0.80, 0.77 and 0.77 for the first 20 ranked SR, NDVI and TVI respectively). The red edge position yielded comparable results to the narrow band vegetation indices involving the red edge bands. These results indicate that at high canopy density, pasture biomass may be more accurately estimated by vegetation indices based on wavelengths located in the red edge than the standard NDVI.
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