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The degree to which vegetation absorbs photosynthetically active radiation. It is usually quantified using the Normalised Difference Vegetation Index (NDVI) or the Enhanced Vegetation Index (EVI).
(Source: Huet et al. (2002) Overview of the radiometric and biophysical performance of the MODIS vegetation indices. Remote Sensing of Environment, 83, 195–213. http://dx.doi.org/10.1016/S0034-4257(02)00096-2 )