MODIS/Terra Nadir BRDF-Adjusted Reflectance 16-Day L3 Global 1km SIN Grid


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EDG Data Set Name Granule Shortname

MODIS/Terra Nadir BRDF-Adjusted Reflectance 16-Day L3 Global 1km SIN Grid MOD43B4

Version Acquisition Range Science Quality Status

V003 August 29, 2002 (2002241) - October 7, 2002 (2002280) Provisional as of Nov 1, 2000

V004 February 18, 2000 (2000049) Validated Stage 1 as of February 18, 2000

MODIS/Terra Image MOD43B4

Data Set Characteristics
Area = ~ 10° x 10° lat/long
Image Dimensions = 3 (1200x1200x7 row/column/band)
Average File Size = 30 MB
Resolution = 1000 meters
Projection = Sinusoidal
Data Format = HDF-EOS
Science Data Sets (SDSs) = 2

Product Description

The MODerate-resolution Imaging Spectroradiometer (MODIS) Bidirectional Reflectance Distribution Function (BRDF)/Albedo products describe how land surfaces appear under perfect scattering conditions without the influence of view angle. Every 16 days, the BRDF/Albedo algorithm relies on multidate, atmospherically corrected, cloud-cleared data and a semiempirical kernel-driven bidirectional reflectance model to determine a global set of parameters describing the BRDF of the land surface. These one kilometer gridded parameters are then used to determine directional hemispherical reflectance ("black-sky albedo"), bihemispherical reflectance ("white-sky albedo"), and nadir BRDF-adjusted reflectance (NBAR) for seven spectral bands and (in the case of albedo) three broad bands. By providing model parameters and extensive quality information, the MODIS BRDF/Albedo products offer the global remote sensing and modeling community the additional flexibility to derive reflectance and albedo measures particularly suited to their specific applications. BRDF/Albedo products are provided globally as discrete 1200 by 1200 element tiles in a Sinusoidal Grid projection (MOD43Bs) and on 0.05 degree Climate Model Grids (MOD43Cs), both in HDF-EOS format.

The MODIS/Terra Nadir BRDF-Adjusted Reflectance 16-Day L3 Global 1km SIN Grid product, MOD43B4, NBAR at the mean solar zenith angle of Terra overpasses during the 16-day period. This three-dimensional product removes the directional effects of view angle, calculating reflectance as if every pixel was viewed from nadir.

The MOD43B4 image above depicts the NBAR over the Great Lakes region between Canada and the United States using a band 1-4-3 RGB combination of data collected in July 2005.

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.

SDS Units Data Type-bit Fill Value Valid Range Multiply by
Scale Factor Dimensions

Nadir_Reflectance Reflectance 16-bit signed integer 32767 0 - 32766 0.0001 1D X-Dim
2D Y-Dim
3D#Land Bands

*Nadir_Reflectance_
Quality Concatenated Flags 32-bit unsigned integer 4294967295 0-4294967294 na 1D X-Dim
2D Y-Dim
3D # QC Words

*MODIS BRDF/Albedo QA Science Data Sets

View a Version Formatted for Printing

Retrieve the MOD43B4v4 MODIS product through the LP DAAC Data Pool
Via Search Tool: http://e4eil01u.ecs.nasa.gov:22000/WebAccess/drill?attrib=esdt&esdt=MOD43B4.4&group=MOLT
Via FTP Directory: ftp://e4ftl01u.ecs.nasa.gov/MOLT/MOD43B4.004/

Order These Data through the EOS Data Gateway
MODIS/TERRA NADIR BRDF-ADJUSTED REFLECTANCE 16-DAY L3 GLOBAL 1KM SIN GRID V004

EOS Data Gateway Search Tips

Data Center: LPDAAC

Sensor: MODIS

Dataset: MODIS/Terra Nadir BRDF-Adjusted Reflectance 16-Day L3 Global 1km SIN Grid

Spatial: HORIZONTALTILENUMBER Max/Min VERTICALTILENUMBER Max/Min

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

Temporal Extent: 2000-02-18 to present

Product Information

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

User Guide
(http://www-modis.bu.edu/brdf/userguide/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 1 (2000)
(http://eospso.gsfc.nasa.gov/eos_homepage/for_scientists/data_products/vol1.php)

Contact Information

LP DAAC User Services
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URL: http://LPDAAC.usgs.gov/modis/mod43b4v4.asp
Technical Contact: LPDAAC@eos.nasa.gov
Last Update: Tuesday, April 25, 2006
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