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Version	Acquisition Range	Science Quality Status
V004	January 1, 2004 (2004001)	No status available

MODIS Level 3 Tile h08v05, April 1, 2004

Data Set Characteristics
Area = ~ 10° x 10° lat/long
Image Dimensions = 2 (1200x1200 row/column)
Average File Size = 32 MB
Resolution = 1 km
Projection = Sinusoidal
Data Format = HDF-EOS
Science Data Sets (SDSs) = 11

Product Description
The MODerate-resolution Imaging Spectroradiometer (MODIS) Vegetation Indices products use, as input, MODIS Terra surface reflectances (MOD09) 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 (EVI) 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.

The MODIS/Terra Vegetation Indices Monthly L3 Global 1km SIN Grid (MOD13A3) is temporally averaged from all surface reflectance data available in the16-day MODIS VI products (a maximum of 3) that overlap the calendar month. Each input 16-day product (MOD13A2) is weighted by the number of actual days that overlap the month being processed. The algorithm first produces monthly surface reflectance from the red, near-infrared (NIR), blue and mid-infrared (MIR) data in the MOD13A2, then derives the monthly VI. A worst-case scenario is used to generate the per-pixel quality information.

The MOD13A3 images shown are pseudo-colored samples of NDVI and EVI representing the biomass health of the western United States using tile h08v05 from April 1, 2004. 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.

Each VI product contains 11 parameters, listed below:

SDS	UNITS	DATA TYPE-bit	FILL VALUE	VALID RANGE	Divide by SCALE FACTOR
1km monthly NDVI	NDVI	16-bit signed integer	-3000	-2000 - 10000	10000
1km monthly EVI	EVI	16-bit signed integer	-3000	-2000 - 10000	10000
*1km monthly NDVI Quality	bit field	16-bit unsigned integer	65535	0 - 65535	na
*1km monthly EVI Quality	bit field	16-bit unsigned integer	65535	0 - 65535	na
1km monthly red reflectance MODIS Band # 1, 620 - 670 nm	reflectance	16-bit signed integer	-1000	0 - 10000	10000
1km monthly NIR reflectance MODIS Band # 2, 841- 876 nm	reflectance	16-bit signed integer	-1000	0 - 10000	10000
1km monthly blue reflectance MODIS Band # 3, 459 - 479 nm	reflectance	16-bit signed integer	-1000	0 - 10000	10000
1km monthly MIR reflectance MODIS Band # 7, 2105 - 2155 nm	reflectance	16-bit signed integer	-1000	0 - 10000	10000
1km monthly average view zenith angle View zenith of the chosen pixel	degree	16-bit signed integer	-10000	-9000 - 9000	100
1km monthly average sun zenith angle Sun zenith of the chosen pixel	degree	16-bit signed integer	-10000	-9000 - 9000	100
1km monthly average relative azimuth angle Relative Azimuth of the chosen pixel	degree	16-bit signed integer	-4000	-3600 - 3600	10

*MODIS Vegetation Indices QA Science Data Sets

View a Version Formatted for Printing

Retrieve the MOD13A3v4 MODIS product through the LP DAAC Data Pool
Via Search Tool: http://e4eil01u.ecs.nasa.gov:22000/WebAccess/drill?attrib=esdt&esdt=MOD13A3.4&group=MOLT
Via FTP Directory: ftp://e4ftl01u.ecs.nasa.gov/MOLT/MOD13A3.004/

Order These Data through the EOS Data Gateway
MODIS/TERRA VEGETATION INDICES MONTHLY L3 GLOBAL 1KM SIN GRID V004

EOS Data Gateway Search Tips

Source:	Terra
Sensor:	MODIS
Dataset:	MODIS/Terra Vegetation Indices Monthly L3 Global 1km SIN Grid
Spatial:	HORIZONTALTILENUMBER Max/Min VERTICALTILENUMBER Max/Min
Geographic Extent:	Type Lat/Long Range or Draw on Map
Temporal Extent:	2004-03-02 to present (V004)

Product Information

Product Description (http://landval.gsfc.nasa.gov/MODLAND/vi.htm)

User Guide (http://tbrs.arizona.edu/project/MODIS/UserGuide_doc.php)

More Info on MODIS VI http://tbrs.arizona.edu/cdrom/Index.html

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

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

EOS Data Products Handbook Volume 2 (2000) (http://eospso.gsfc.nasa.gov/eos_homepage/for_scientists/data_products/vol2.php)

Contact Information

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Phone:	605-594-6116
Toll Free:	866-573-3222
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