|
| EDG Data Set Name |
Granule Shortname |
| MODIS/Terra Vegetation Indices 16-Day L3 Global 500m SIN Grid |
MOD13A1 |
| Version |
Acquisition Range |
Science Quality Status |
| V003 |
August 29, 2002 (2002241) - October 7, 2002 (2002280) |
Provisional as of Nov 1, 2000 |
| V004 |
February 24, 2000 (2000055) - Present |
Stage 2 Validation |
MODIS Level 3 Tile h08v05, August 12, 2001
Data Set Characteristics
Area = ~ 10° x 10° lat/long
Image Dimensions = 2 (2400x2400 row/column)
Average File Size = 128 MB
Resolution = 500 meters
Projection = Sinusoidal
Data Format = HDF-EOS
Science Data Sets (SDSs) = 11
Product Description
The MOD13A1 image shown is a sample of the MODIS Level 3 16-day composite
of Vegetation Indices at 500m resolution that has been pseudo-colored. This
product uses, as input, MODIS Terra surface reflectances corrected for molecular scattering, ozone absorption, and aerosols. Two
vegetation index (VI) algorithms are produced globally for land. One is the
standard normalized difference vegetation index (NDVI), which is referred to
as the "continuity index" to the existing NOAA-AVHRR derived NDVI.
The other is an 'enhanced' vegetation index with improved sensitivity into
high biomass regions and improved vegetation monitoring through a de-coupling
of the canopy background signal and a reduction in atmosphere influences. The
two VIs compliment each other in global vegetation studies and improve upon
the extraction of canopy biophysical parameters. A new compositing scheme that
reduces angular, sun-target-sensor variations with an option to use BRDF
models is utilized. The gridded vegetation indices include quality assurance
(QA) flags with statistical data that indicate the quality of the VI product
and input data. Due to their simplicity, ease of application, and widespread
familiarity, vegetation indices have a wide range of usage within the user
community. Some of the more common applications may include global
biogeochemical and hydrologic modeling, agricultural monitoring and
forecasting, land-use planning, land cover characterization, and land cover
change detection.
NOTE: These products are validated, meaning that product uncertainties
are well defined over a range of representative conditions. Although there may
be later improved versions, these data are ready for use in scientific
publications.
Each VI product contains 11 parameters, listed below:
| SDS |
UNITS |
DATA TYPE-bit |
FILL VALUE |
VALID RANGE |
Divide by
SCALE FACTOR |
| 500m 16 days NDVI |
NDVI |
16-bit signed integer |
-3000 |
-2000 - 10000 |
10000 |
| 500m 16 days EVI |
EVI |
16-bit signed integer |
-3000 |
-2000 - 10000 |
10000 |
| *500m 16 days NDVI Quality |
bit field |
16-bit unsigned integer |
65535 |
0 - 65536 |
na |
| *500m 16 days EVI Quality |
bit field |
16-bit unsigned integer |
65535 |
0 - 65536 |
na |
500m 16 days red reflectance
MODIS Band # 1, 620 - 670 nm |
reflectance |
16-bit signed integer |
-1000 |
0 - 10000 |
10000 |
500m 16 days NIR reflectance
MODIS Band # 2, 841- 876 nm |
reflectance |
16-bit signed integer |
-1000 |
0 - 10000 |
10000 |
500m 16 days blue reflectance
MODIS Band # 3, 459 - 479 nm |
reflectance |
16-bit signed integer |
-1000 |
0 - 10000 |
10000 |
500m 16 days MIR reflectance
MODIS Band # 7, 2105- 2155 nm |
reflectance |
16-bit signed integer |
-1000 |
0 - 10000 |
10000 |
500m 16 days average view zenith angle
View zenith of the chosen pixel |
degree |
16-bit signed integer |
-10000 |
-9000 - 9000 |
100 |
500m 16 days average sun zenith angle
Sun zenith of the chosen pixel |
degree |
16-bit signed integer |
-10000 |
-9000 - 9000 |
100 |
500m 16 days average relative azimuth angle
Relative Azimuth of the chosen pixel |
degree |
16-bit signed integer |
-4000 |
-3600 - 3600 |
10 |
*Quality Control Bit Index
| Bit |
Description |
| 0-1 |
NDVI quality |
|
00 NDVI produced, good quality; |
|
01 NDVI produced, but check QA |
|
10 produced but most likely cloudy pixel |
|
11 pixel not produced due to other reasons than clouds |
| 2-5 |
VI usefulness four bit range 0= highest quality |
|
13 no atmospheric correction performed |
|
14 quality too low to be useful |
|
15 not useful for any other reason |
| 6-7 |
aerosol quantity: |
|
00 climatology |
|
01 low |
|
10 average |
|
11 high |
| 8 |
1 yes adjacency correction performed |
|
0 no adjacency correction performed |
| 9 |
1 yes atmosphere BRDF correction performed |
|
0 no atmosphere BRDF correction performed |
| 10 |
1 yes mixed clouds |
|
0 no mixed clouds |
| 11-12 |
land/water flag |
|
00 ocean |
|
01 coast |
|
10 wetland |
|
11 land |
| 13 |
1 yes possible snow/ice |
|
0 no possible snow/ice |
| 14 |
1 yes possible shadow |
|
0 no possible shadow |
| 15 |
composite method for NDVI |
|
0 BRDF model based nadir equivalent VI |
|
1 CVMVC (constraint view angle maximum value VI) |
Print or save this information in .pdf format
View .pdf version 
 Retrieve the MOD13A1v4 MODIS product through the LP DAAC Data Pool
Via Search Tool: http://e0dps01u.ecs.nasa.gov:22000/OPS/drill?attrib=esdt&esdt;=MOD13A1.4&group;=MOLT
Via FTP Directory: ftp://e0dps01u.ecs.nasa.gov/MOLT/MOD13A1.004/
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/Terra Vegetation Indices 16-Day L3 Global 500m SIN Grid |
| Spatial: |
HORIZONTALTILENUMBER Max/Min VERTICALTILENUMBER Max/Min |
| Geographic Extent: |
Type Lat/Long Range or Draw on Map |
| Temporal Extent: |
2000-02-24 to present |
Product Information
Contact Information
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