Albedo, fAPAR, Land Surface Temperature, Light Use Efficiency (LUE), NDVI , Precipitation, Solar radiation, Statics and Weather data

fAPAR

fAPAR is defined as the fraction of photosynthetically active radiation (400-700nm) that is absorbed by the vegetation canopy when only absorption by living leaves is taken into account, which is referred to as ‘green’ fAPAR. fAPAR values range from 0 to 1. Together with albedo, fAPAR plays an important role in the radiative energy balance of ecosystems and in the estimation of the carbon balance.

WaPOR application

fAPAR is produced at both levels with a dekadal temporal resolution. It is not published through WaPOR, but is input to various data components, e.g. NPP, E, T and soil moisture.

Table 7: Overview of the intermediate data component fAPAR

Methodology

fAPAR is estimated using a direct relationship between the NDVI and a global fAPAR product, as shown in the equation below. This equation has been derived using polynomial regression between NDVI and the Copernicus fAPAR product. As smoothed and gap-filled NDVIs are used as input, no further processing of the fAPAR is needed.
- fAPAR = 7.110NDVI⁴ – 12.436NDVI³ + 7.055NDVI² – 0.387NDVI – 0.0037