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EDG Data Set Name	Granule Shortname
MODIS/Terra Nadir BRDF-Adjusted Reflectance 16-Day L3 Global 0.05Deg CMG	MOD43C3

Version	Acquisition Range	Science Quality Status
V004	February 18, 2000 (2000049)	Validated Stage 1 as of February 18, 2000

Global Nadir BRDF-Adjusted Reflectance for July 12, 2001.
The color range is from 0-0.2 for all three visible bands.  Missing data are white.

Data Set Characteristics

Area = Global
Image Dimensions = 3 (3600x7200x7 row/column/band)
Average File Size = 446 MB
Resolution = 0.05 degree (~5 km)
Projection = Latitude/Longitude Grid
Data Format = HDF-EOS
Science Data Sets (SDS) = 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 0.05Deg CMG product, MOD43C3, provides NBAR at the mean solar zenith angle of Terra overpasses during the 16-day period. These measures are derived averages that are computed from the 1 km NBAR (MOD43B4) product over all land surfaces. This three-dimensional product removes the directional effects of view angle, calculating reflectance as if every pixel was viewed from nadir.

The MOD43C3 image above is an example of the global NBAR data offered in this product, acquired in May 2005. The color range is from 0-0.2 for all three visible bands. Missing data are white, and include clouds, ocean water, and poor quality pixels.

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	SCALING 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

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Data Center:	LPDAAC
Sensor:	MODIS
Dataset:	MODIS/Terra Nadir BRDF-Adjusted Reflectance 16-Day L3 Global 0.05Deg CMG
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 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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