FAPAR

Two different FAPAR products are available, the first created from a long albedo time series of Advanced Very High Resolution Radiometer (AVHRR) combined with geostationary instruments using the 5D TIP tables (BHR-TIP LAI and FAPAR) and the second one from daily spectral measurements acquired by AVHRR on board a series of National Oceanic and Atmospheric Administration (NOAA) platforms using JRC algorithm (DHR FAPAR).

BHR TIP LAI and FAPAR Product
Produced by: FastOpt
The QA4ECV BHR TIP LAI/FAPAR product contains effective LAI (Leaf Area Index) and FAPAR (Fraction of Absorbed Photosynthetically Active Radiation) derived with the TIP (Two-stream Inversion Package) retrieval method from white-sky albedos (BHR) in the visible and near-infrared broadband. TIP delivers a Gaussian approximation of the probability density functions (PDFs) of the retrieved model parameters of a 1D canopy model which characterise the radiative status of the vegetation-soil system. The method aims at consistency with large-scale climate and Earth system models and does not require assumptions about other factors (e.g. biome type) to be made. FAPAR and effective LAI are retrieved simultaneously and are consistent to each other in the sense of the model assumptions.
The following products are available:
(1) a DAILY global product at 0.5° derived from AVHRR and geostationary instruments from 1982-2016
(2) a DAILY global product at 0.05° derived from AVHRR and geostationary instruments from 1982-2016

DHR FAPAR Product
Produced by: JRC
The QA4ECV DHR product is derived from JRC algorithm optimized using the 1-D radiative transfer model semi-discrete (Gobron et al., 1997) and is designed to extract the green Fraction of Absorbed Photosynthetically Active Radiation (FAPAR) in the plant canopy from the Bidirectional Reflectance Factors (BRFs) measurements and the angular rectified channels in the Band 1 and Band 2, corresponding to the red and near-infrared bands. The retrieval method assumes that the leaves are alive and photosynthesizing, hence the name "green" FAPAR and instantaneous definition, ie under direct illumination (DHR).
The following products are available:
(1) 10-days and monthly products at 0.05°x0.05° from 1982 to 2006
(2) 10-days and monthly products at 0.5°x0.5° from 1982 to 2006