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| EDG Data Set Name | Granule Shortname |
|---|---|
| MODIS/Aqua Leaf Area Index/FPAR 8-day L4 Global 1km SIN Grid | MYD15A2 |
| Version | Acquisition Range | Science Quality Status |
|---|---|---|
| V003 | July 12, 2003 (2003193) – February 1, 2004 (2004032) | Provisional |
| V004 | July 4, 2002 (2002185) | Provisional as of July 4, 2002 |
| Data Set Characteristics Area = ~ 10° x 10° lat/long Image Dimension = 2 (1200x1200 row/column) Average File Size = 5.84 Mb Resolution = 1 kilometer Projection = Sinusoidal Data Format = HDF-EOS Bands = 4 |
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| MYD15A2 - 8-Day LAI browse image representing data produced over the western U.S. between February 2-9, 2004. |
Product Description
The MODerate-resolution Imaging Spectroradiometer (MODIS) Leaf Area Index (LAI) and Fraction of Photosynthetically Active Radiation (FPAR) products are 1km global data products updated once each 8-day period throughout each calendar year. LAI defines an important structural property of a plant canopy as the one sided leaf area per unit ground area. FPAR measures the proportion of available radiation in the photosynthetically active wavelengths (400 to 700 nm) that a canopy absorbs. LAI and FPAR are related to functional process rates of energy and mass exchange.
The MODIS/Aqua Leaf Area Index/FPAR 8-day L4 Global 1km SIN Grid product, MYD15A2, is one of three MODIS products processed to level-4, meaning that it represents the output from a model applied to lower-level MODIS data. LAI/FPAR products are derived from the atmosphere-corrected MODIS surface reflectance product MYD09, MODIS land cover product MOD12, and ancillary information on surface characteristics using a 3D radiative transfer model.
The MYD15A2 above is an LAI browse image representing data produced over the western U.S. between February 2-9, 2004. Both LAI and FPAR have been used extensively as satellite-derived parameters for calculation of surface photosynthesis, evapotranspiration, and annual net primary production. These products are essential in calculating terrestrial energy, carbon, water cycle processes, and biogeochemistry of vegetation.
NOTE:These products are provisional, meaning that product quality may not be optimal. Incremental product improvements are still occurring, and users are urged to contact MODIS Science Team representatives prior to use of the data in publications. These data are likely to be replaced when the validated product becomes available.
| SDS | Units | Data Type -bit | Fill Value | Valid Range | Multiply by Scaling Factor |
Calibrated_nt |
|---|---|---|---|---|---|---|
| Fpar_1km | % | 8-bit unsigned integer | 255 | 0 - 100 | 0.01 | 21 |
| Lai_1km | m^2/m^2 | 8-bit unsigned integer | 255 | 0 - 100 | 0.10 | 21 |
| *FparLai_QC | class flag | 8-bit unsigned integer | 255 | 0 - 254 | na | na |
| FparExtra_QC | class flag | 8-bit unsigned integer | 255 | 0 - 254 | na | na |
*MODIS LAI/FPAR QA Science Data Sets
Non-Terrestrial Value Index/Fill Value Index
| Fpar_1km and Lai_1km | |
| 255 | Fill Value |
| 254 | Water (ocean or inland) |
| 253 | barren, sparse vegetation (rock, tundra, desert) |
| 252 | perennial snow, ice |
| 251 | permanent wetlands/inundated marshland |
| 250 | urban/built-up |
| 249 | unclassified/not able to determine |
View a Version Formatted for Printing
Retrieve the MYD15A2v4 MODIS product through the LP DAAC Data Pool
Via Search Tool: http://e4eil01u.ecs.nasa.gov:22000/WebAccess/drill?attrib=esdt&esdt=MYD15A2.4&group=MOLA
Via FTP Directory: ftp://e4ftl01u.ecs.nasa.gov/MOLA/MYD15A2.004/
Order These Data through the EOS Data Gateway
MODIS/AQUA LEAF AREA INDEX/FPAR 8-DAY L4 GLOBAL 1KM SIN GRID V004
EOS Data Gateway Search Tips
| Source: | Aqua |
|---|---|
| Sensor: | MODIS |
| Dataset: | MODIS/Aqua Leaf Area Index/FPAR 8-day L4 Global 1km SIN Grid |
| Spatial: | HORIZONTALTILENUMBER Max/Min VERTICALTILENUMBER Max/Min |
| Geographic Extent: | Type Lat/Long Range or Draw on Map |
| Temporal Extent: | 2003-07-12 to 2004-02-01 (V003); 2002-07-04 to present (V004) |
Product Information
Contact Information
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LP DAAC User Services U.S. Geological Survey (USGS) Earth Resources Observation and Science Center (EROS) 47914 252nd Street Sioux Falls, SD 57198-0001 |
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|---|---|
| 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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