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MODIS/Terra Leaf Area Index/FPAR 8-Day L3 Global 1km SIN Grid V005

V005 MOD15A2 Changes (abbreviated Points of Interest below)

V005 MOD15A2 Science Data Sets (specifications for data layers)

V005 MOD15A2 Quality Information   

Look here for the Combined 4-day and 8-day LAI/FPAR composites.

Data Characteristics Area: ~10 degrees x 10 degrees lat/long Dimensions: 1200 x 1200 rows/columns File Size: ~ 0.2 MB compressed Resolution: 1 kilometer Projection: Sinusoidal Data Format: HDF-EOS Science Data Sets (SDS HDF Layers): 6	This image is pseudo-colored to display the Fraction of Photosynthetically Active Radiation (FPAR) calculated over north-central U.S., from the Great Lakes westward across the Northern Great Plains.  These data collected between March 6 – 13, 2007 indicate more vegetation growing furthest to the East, as expected during this time of the year.

V005 Change Points of Interest:

• Algorithm refinements were targeted to improve quality of LAI/FPAR retrievals and consistency with field measurements over all biomes but with major focus on woody vegetation.
• Old 6-biome LAI/FPAR map was replaced with new 8-biome map (broadleaf and needle leaf forest classes were split into deciduous and evergreen subclasses).
• Refinement of the LUTs of the LAI/FPAR algorithm for all 8 biomes.
• Reduced file volume by using internal compression

Product Description

The level-4 MODIS global Leaf Area Index (LAI) and Fraction of Photosynthetically Active Radiation (FPAR) product is composited every 8 days at 1-kilometer resolution on a Sinusoidal grid.  Science Data Sets provided in the MOD15A2 include LAI, FPAR, a quality rating, and standard deviation for each variable. 

The LAI variable defines the number of equivalent layers of leaves relative to a unit of ground area, whereas FPAR measures the proportion of available radiation in the photosynthetically active wavelengths that are absorbed by a canopy.  Both variables are used as satellite-derived parameters for calculating surface photosynthesis, evapotranspiration, and net primary production, which in turn are used to calculate terrestrial energy, carbon, water cycle processes, and biogeochemistry of vegetation.

Version-5 MODIS/Terra LAI/FPAR products are Validated Stage 1, meaning that accuracy has been estimated using a small number of independent measurements obtained from selected locations and time periods and ground-truth/field program efforts.  Although there may be later improved versions, these data are ready for use in scientific publications.

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Product Information

Product Description http://modis-land.gsfc.nasa.gov/lai.htm

User Guide http://cybele.bu.edu/modismisr/products/modis/userguide.pdf

Algorithm Theoretical Basis Document (ATBD) http://modis.gsfc.nasa.gov/data/atbd/atbd_mod15.pdf

MODIS Standard Data Products Catalog http://modis.gsfc.nasa.gov/data/dataprod/index.php

EOS Data Products Handbook Volume 1 (2000) http://eospso.gsfc.nasa.gov/eos_homepage/for_scientists/data_products/vol1.php

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