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Name: Leaf Area Index
Acronym: LAI
Description: The LAI is a structural measures of plant canopies. The LAI relates to the Fraction of Absorbed Photosynthetically Active Radiation (FAPAR), which is a radiometric measure of plant canopy. LAI and FAPAR have been derived from earlier Normalized Difference Vegetation Index (NDVI) algorithms but are specific and verifiablebiophysical variables, in contrast to abstract and dimensionless indices such as NDVI. There are now a small number of global datasets derived from common, although not identical, algorithms, and from different sensors, mostly SeaWifs, MERIS and MODIS.There are also several 10-30 year long global time-series datasets at resolutions of 1 km to 8 km that are progressively being used by the wider earth science community. Moreover, next-generation sensors such as Sentinel 3 and VIIRS are planning to ensure the continuity of these critical datasets. These datasets are at a stage of maturity and wide interest where a formal intercomparison and validation is essential to using them with confidence. TheLand Production Validation (LPV) subgroup of the Committee on Earth Observation Satellites (CEOS) Working Group on Calibration and Validation (WGCV) has developed a voluntary international committee to attempt this intercomparison for FAPAR/LAI.
Type: Noun
Term is: Variable
Term has: