The FAPAR is defined as the fraction of photosynthetically active radiation (400-700 nm) absorbed by the green vegetation (Fraction of Absorbed Photosynthetically Active Radiation).
This variable expresses the energy absorption capacity of the vegetation and thus its growing capacity.
It is an unitless measure comprised between 0 and 1. Canopy with a FAPAR of 1 totally absorbs the photosynthetically active radiation whereas a FAPAR of 0 indicates no absorption. FAPAR can be estimated by ground measurements (see here) or through satellite/airborne sensors.
Unit: percent or fraction
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