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V005 MYD15A2 Changes (abbreviated Points of Interest below)
V005 MYD15A2 Science Data Sets (specifications for data layers)
V005 MYD15A2 Quality Information
Look here for the Combined (Terra + Aqua) 4-day and 8-day LAI/FPAR composites.

July 2003	October 2003
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	These MYD15A2 images are pseudo-colored to display the Fraction of Photosynthetically Active Radiation (FPAR) calculated over the northeast U.S. (tile h11v05). Between 8-day periods in July and October 2003, decreasing levels of green clearly indicate the progression of Summer to Fall.

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 MYD15A2 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/Aqua 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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Retrieve the MOD15A2.5 MODIS product through the LP DAAC Data Pool
Via Search Tool: http://e4eil01u.ecs.nasa.gov:22000/WebAccess/drill?attrib=esdt&esdt=MYD15A2.5&group=MOLA
Via FTP Directory: ftp://e4ftl01u.ecs.nasa.gov/MOLA/MYD15A2.005//

Order Data through the EOS Data Gateway
(http://edcimswww.cr.usgs.gov/pub/imswelcome/)

EOS Data Gateway Search Tips

Data Center:	LPDAAC
Sensor:	MODIS
Dataset:	MODIS/Aqua Leaf Area Index/FPAR 8-Day L3 Global 1km SIN Grid V005
Spatial:	HORIZONTALTILENUMBER Max/Min VERTICALTILENUMBER Max/Min
Geographic Extent:	Type Lat/Long Range or Draw on Map
Temporal Extent:	2002-07-04 to present

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

Contact Information

LP DAAC User Services U.S. Geological Survey (USGS) Earth Resources Observation and Science Center (EROS) 47914 252nd Street Sioux Falls, SD 57198-0001
Phone:	605-594-6116
Toll Free:	866-573-3222
	866-LPE-DAAC
Fax:	605-594-6963
Email:	LPDAAC@eos.nasa.gov
Web:	http://LPDAAC.usgs.gov

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