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EDG Data Set Name	Granule Shortname
MODIS/Terra+Aqua Nadir BRDF-Adjusted Reflectance 16-Day L3 Global 1km SIN Grid	MCD43B4

Version	Acquisition Range	Science Quality Status
V004	July 4 2002 (2002185)	Validated

Nadir BRDF-Adjusted Reflectance of North America for August 13, 2002.
NIR (0.1-0.4) Red (0.0-0.16) Green (0.0-0.18)

Data Set Characteristics
Area = ~ 10° x 10° lat/long
Image Dimensions = 3 (1200x1200x7 row/column/band)
Average File Size = ~52 MB
Resolution = 1000 meters
Projection = Sinusoidal
Data Format = HDF-EOS
Science Data Sets (SDSs) = 3

Product Description
Every 16 days, the MODIS BRDF/Albedo Product (MCD43B) 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 Bidirectional Reflectance Distribution Function (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 narrow spectral bands and (in the case of albedo) three broad bands. Since the parameters of the simple kernel-based BRDF model (RossThickLiSparseR) are also provided, along with extensive quality information, the MODIS BRDF/Albedo Product offers members of the global remote sensing and modeling community the additional flexibility to derive reflectance and albedo measures particularlysuited to their specific applications.

MCD43B is a MODLAND Level 3 Product and is provided globally as discrete 1200 by 1200 element tiles in a Sinusoidal Grid projection in a HDF-EOS format. MCD43B1 provides the primary BRDF model parameters. MCD43B3 provides the black-sky albedo (at the mean solar zenith angle at local solar noon) and the white-sky albedo. MCD43B4 provides two NBAR values, one at the mean solar zenith angle of Terra overpasses during the 16-day period and the other at the mean solar zenith angle of the Aqua overpasses. Quality information is replicated and available with each quantity.

MCD products are generated using a combination of Terra and Aqua acquisitions to optimize data quality.

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_PM	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 MCD43B4v4 MODIS product through the LP DAAC Data Pool
Via Search Tool: http://e4eil01u.ecs.nasa.gov:22000/WebAccess/drill?attrib=esdt&esdt=MCD43B4.4&group=MOTA
Via FTP Directory: ftp://e4ftl01u.ecs.nasa.gov/MOTA/MCD43B4.004/

Order These Data through the EOS Data Gateway
MODIS/TERRA+AQUA BRDF/ALBEDO MODEL-1 16-DAY L3 GLOBAL 1KM SIN GRID V004

EOS Data Gateway Search Tips

Source:	Terra or Aqua
Sensor:	MODIS
Dataset:	MODIS/Terra+Aqua 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:	2002-07-04 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 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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Fax:	605-594-6963
Email:	LPDAAC@eos.nasa.gov
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