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Granule Shortname
MOD43B1

Data Set Characteristics
Area = ~10° X 10° latitude/longitude
Size = 1200 X 1200 rows/columns
File Size = ~112MB
Resolution = 1 kilometer
Projection = Integerized Sinusoidal
Data Type Fire Mask = 16-bit signed integer
Data Format = HDF-EOS
Science Data Sets (SDSs) = 4
Dimensions = 4 (row x column x data x band)

Product Description
MOD43B1 contains four dimensional data sets of BRDF and Albedo parameters: x,y, and parameter values are stored for each wavelength band of data. Note in the table below that the "BRDF Albedo Parameters Dimensions" cell reflects the use of all 7 MODIS Land Bands (459-2155 nm) in addition to 3 broad bands compiled from 300-700 nm, 700-5000 nm, and 300-5000 nm. This 4D combination provides users with spatial orientation as well as the weighting parameters associated with the models best describing the differences in radiation due to scattering (anisotropy) of each pixel.

MODLAND's Level 3 BRDF/Albedo products (MOD43Bs) are provided globally as discrete 1200 by 1200 element tiles in an Integerized Sinusoidal Grid projection in a HDF-EOS format. MOD43B1 provides the BRDF model parameters, MOD43B3 provides the black-sky albedo (at a solar zenith angle of 45 degrees) and the white-sky albedo, and MOD43B4 provides the NBAR value at the mean solar zenith angle of the 16 day period. Quality information is replicated and available with each quantity.

Every 16 days, the MODIS BRDF/Albedo Product (MOD43B) 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. 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 observation and modeling community the additional flexibility to derive reflectance and albedo measures particularly suited to their specific applications.

SDS	Units	Data Type -bit	Fill Value	Valid Range	Scale Factor	Dimensions	Calibrated NT
BRDF Albedo Parameters	Reflectance	Sign 16	32767	0,32766	0.001	X-Dim Y-Dim # Land Bands +3 # Parameters	5
BRDF Shape Indicators	Ratio or coefficient	Uns 8	127	-128,126	0.1	X-Dim Y-Dim # Shape Fields	5
BRDF Quality *see QC Table below	Concatenated flags	Uns 32	4.3e9	0	na	X-Dim Y-Dim # QC Words	na
BRDF Type	Model or Type #	Uns 8	255	0,254	na	X-Dim Y-Dim # Type Fields	na

QC Word One (band dependent)
00-01 Mandatory QA	0 = processed, good quality 1 = processed, see other QA 2 = not processed due to cloud effects 3 = not processed due to other effects
02-03 Period used 0 = 16 days	1 = 32 days
04-07 Land/Water 0 = Shallow ocean	1 = Land (Nothing else but land) 2 = Ocean and lake shorelines 3 = Shallow inland water 4 = Ephemeral water 5 = Deep inland water 6 = Moderate or continental ocean 7 = Deep ocean
08-10 AM/MISR/PM 0 = AM	1 = AM/PM 2 = AM/PM/MISR 3 = AM/MISR 4 = PM 5 = PM/MISR 6 = MISR
11-15 Mean Sun Angle	0 = 0-5 degrees 1 = 5-10 degrees 2 = 10-15 degrees 3 = 15-20 degrees 4 = 20-25 degrees 5 = 25-30 degrees 6 = 30-35 degrees 7 = 35-40 degrees 8 = 40-45 degrees 9 = 45-50 degrees 10= 50-55 degrees 11= 55-60 degrees 12= 60-65 degrees 13= 65-70 degrees 14= 70-75 degree 15= 75-80 degrees 16= 80-90 degrees
16-17 Snow 0 = no Snow	1 = Snow present
18-30 TBD
31 QAfill	0 = not fill-value 1 = fill-value 4 = RMSE moderate, WoD(NBAR) good, WoD(WSA) good 5 = RMSE moderate, WoD(NBAR) good, WoD(WSA) moderate 6 = RMSE moderate, WoD(NBAR) moderate, WoD(WSA) good 7 = RMSE moderate, WoD(NBAR) moderate, WoD(WSA) moderate 8 = magnitude inversion (numobs >=7) 9 = magnitude inversion (numobs >3&<7) 10= magnitude inversion (numobs <=3) 11= Bus-in DB parameters 15= Fill value
04-07 Band 2 Quality (see explanation for band 1)
08-11 Band 3 Quality (see explanation for band 1)
12-15 Band 4 Quality (see explanation for band 1)
16-19 Band 5 Quality (see explanation for band 1)
20-23 Band 6 Quality (see explanation for band 1)
24-27 Band 7 Quality (see explanation for band 1)
28-30 TBD
31 QAFill	0 = not fill-value 1 = fill value

View a Version Formatted for Printing

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

EOS Data Gateway Search Tips

Data Center:	LPDAAC
Sensor:	MODIS
Dataset:	MODIS/Terra BRDF/Albedo Model-1 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/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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