|
| 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 |
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 |
 |
|
MYD15A2 - 8-Day LAI browse image representing data produced over the western U.S. between
February 2-9, 2004. |
Product Description
The MYD15 Leaf Area Index (LAI) and Fraction of Photosynthetically Active
Radiation absorbed by vegetation (FPAR), are 1 km 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.
These products are derived from the atmosphere corrected surface reflectance
product MYD09,
land cover product MYD12
and ancillary information on surface characteristics using a 3D radiative
transfer model. LAI and FPAR are biophysical variables which describe canopy
structure and are related to functional process rates of energy and mass
exchange. 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 |
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 |
QC for daily FPAR and LAI
| FparLai_QC 4 BITFIELDS IN 8-BITWORD |
| MODLAND_QC |
START 0 END 1 VALIDS 4 |
| |
00=0 |
Best Possible |
| |
01=1 |
OK, but not the best |
| |
10=2 |
Not produced,due to cloud |
| |
11=3 |
Not produced,due to other reasons |
| |
|
|
| DEADDETECTOR |
START 2 END 2 VALIDS 2 |
| |
0=0 |
Detectors apparently fine for up to 50% of channels 1,2 |
| |
1=1 |
Dead detectors caused >50% adjacent detector retrieval |
| |
|
|
| CLOUDSTATE |
START3 END 4 VALIDS 4 |
| |
00=0 |
Significant clouds NOT present (clear) |
| |
01=1 |
Significant clouds WERE present |
| |
10=2 |
Mixed cloud present on pixel |
| |
11=3 |
cloud state not defined,assumed clear |
| |
|
|
| SCF_QC |
START 5 END 7 VALIDS 4 |
| |
000=0 |
Main (RT) method used with the best possible results |
| |
001=1 |
Main (RT) method used with saturation |
| |
010=2 |
Main (RT) method failed due to geometry problems, empirical method used |
| |
011=3 |
Main(RT) method failed due to problems other than geometry, empirical method used |
| |
100=4 |
Couldn't retrieve pixel |
Print or save this information in .pdf format
View .pdf version 
 Retrieve the MYD15A2v4 MODIS product through the LP DAAC Data Pool
Via Search Tool: http://e0dps01u.ecs.nasa.gov:22000/OPS/drill?attrib=esdt&esdt;=MYD15A2.4&group;=MOLA
Via FTP Directory: ftp://e0dps01u.ecs.nasa.gov/MOLA/MYD15A2.004/
Order Data through the EOS Data Gateway
( http://edcimswww.cr.usgs.gov/pub/imswelcome/)
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
|
