MODIS/Terra Vegetation Indices 16-Day L3 Global 1km ISIN Grid


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MODIS/Terra Image MOD13A2

EDG Data Set Name
MODIS/Terra Vegetation Indices 16-Day L3 Global 1km ISIN Grid

Granule Shortname
MOD13A2

Data Set Characteristics
Area = ~ 10° x 10° lat/long
Size = 1200 x 1200 rows/columns
File Size = ~50 MB (variable)
Resolution = 1000 meters
Projection = Integerized Sinusoidal
Data Format = HDF-EOS
Science Data Sets (SDSs) = 11

Product Description
The MOD13A2 image shown above is a sample of the MODIS Level 3 16-day composite of Vegetation Indices at 1Km resolution that has been psuedo-colored. This product uses, as input, MODIS Terra surface reflectances, corrected for molecular scattering, ozone absorption, and aerosols, and adjusted to nadir and standard sun angles with use of BRDF models. 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 is also utilized. The gridded vegetation indices will 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 use 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 characterizaton, and land cover change detection.

NOTE: These products are still experimental in nature upon their initial release. Investigations are underway to assess the scientific validity of these products.

SDS UNITS DATA TYPE-bit FILL VALUE VALID RANGE SCALE FACTOR

NDVI NDVI 16-bit integer -3000 -2000-10000 10000

EVI EVI 16-bit integer -3000 -2000-10000 10000

NDVI Quality bit field 16-bit unsigned integer 65535 0-65534 na

EVI Quality bit field 16-bit unsigned integer 65535 0-65534 na

Red Reflectance relectance 16-bit integer -1000 0-10000 10000

NIR Reflectance relectance 16-bit integer -1000 0-10000 10000

Blue Reflectance relectance 16-bit integer -1000 0-10000 10000

MIR Reflectance relectance 16-bit integer -1000 0-10000 10000

Viewing Zenith Angle degree 16-bit integer -10000 -9000-9000 100

Solar Zenith Angle degree 16-bit integer -10000 -9000-9000 100

Relative Azimuth Angle degree 16-bit integer -4000 -3600-3600 10

View a Version Formatted for Printing

Order These Data through the EOS Data Gateway
MODIS/TERRA VEGETATION INDICES 16-DAY L3 GLOBAL 1KM ISIN GRID V003

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Data Center: LPDAAC

Sensor: MODIS

Dataset: MODIS/Terra Vegetation Indices 16-Day L3 Global 1km ISIN Grid

Geographic Extent: Type Lat/Long Range or Draw on Map

Temporal Extent: August 29, 2002 (2002241) - October 7, 2002 (2002280)

Product Information

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

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

Algorithm Theoretical Basis Document (ATBD)
(http://modis.gsfc.nasa.gov/data/atbd/atbd_mod13.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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URL: http://LPDAAC.usgs.gov/modis/mod13a2.asp
Technical Contact: LPDAAC@eos.nasa.gov
Last Update: Monday, June 13, 2005
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