EDG Data Set Name
MODIS/Terra BRDF/Albedo Model-1 16-Day L3 Global 1km ISIN Grid
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 |
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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
Contact Information
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