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BRDF Isotropic Weight for Band 1: This image is a visual representation of one of the
parameters used to model MODIS BRDF and Albedo.
EDG Data Set Name
MODIS/Terra BRDF/Albedo Parameters 16-Day L3 Global 0.25Deg CMG
Granule Shortname
MOD43C2
Data Set Characteristics
Area = Global
Image Dimensions = 720 rows X 1440 columns X 10 bands
HDF Data Set Storage Order: Band Interleaved by Pixel (BIP)
Volume = ~66.7 MB
Resolution = 0.25 degree (~28 km)
Projection = Latitude/Longitude Grid
Data Type Albedo = 16-bit Signed Integer
Data Type Quality = 32-bit Unsigned Integer
Data Format = HDF-EOS
Science Data Sets (SDS) = 4
Product Description
The 16-day 0.25 deg global BRDF/Albedo parameter product (MOD43C2) is a level-3 Climate Modeling Grid that provides the model parameters used to create the MODIS Global Albedo product (MOD43C1). The MOD43C2 product is offered on a flat latitude/longitude grid in HDF-EOS format. Three BRDF model parameter values are given for each of 10 wavelength bands (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). These three weighting parameters (fiso , fvol , fgeo ) are associated with the RossThickLiSparseReciprocal BRDF semi-empirical model which best describes the scattering (anisotropy) of each pixel. The data are stored band interleaved by pixel. Extensive quality information (in a bit-packed format) is also provided (720 rows by 1440 columns).
The global measures of albedo are derived averages that are computed from the 16-day 1-km global albedo product (MOD43B3). The 1-km global albedo is computed by integrating the Bi-directional Reflectance Distribution Function (BRDF), which describes the characteristic anisotropy of the land surface. The MODIS BRDF parameters (MOD43B1) are the best fit model weights determined by inverting the multi-date, multi-angular, cloud-free, atmospherically corrected surface reflectance observations acquired by MODIS over a 16-day period. These parameters can be used in a forward version of the model to fully reconstruct the surface BRDF and thus correct directional reflectances to a common view geometry or to
compute the integrated black-sky (at any desired solar zenith angle) and white-sky albedos (as is done for MOD43C1). Alternately, the parameters can be used directly with a simple polynomial to easily estimate the black-sky albedo with good accuracy for any desired solar zenith angle.
| SDS |
UNITS |
DATA TYPE -bit |
FILL VALUE |
VALID RANGE |
SCALING FACTOR |
CALIBRATED NT |
FIXED WATER BRDF PARAMETER |
| BRDF_Albedo_Parameter0 (isotropic) |
No units |
Signed 16 |
32767 |
0-32766 |
0.001 |
5 |
0.04 |
| BRDF_Albedo_Parameter1 (volumetric) |
No units |
Signed 16 |
32767 |
0-32766 |
0.001 |
5 |
0.00 |
| BRDF_Albedo_Parameter1 (geometric) |
No units |
Signed 16 |
32767 |
0-32766 |
0.001 |
5 |
0.00 |
| Aggregated Albedo Quality |
Flags |
Unsigned 32 |
4294967295 |
0-4294967294 |
na |
na |
na |
| QC Bit Description |
Quality Control Explanation |
| 00-01 Mandatory QA |
0 = Majority processed, good quality |
|
1 = Majority processed, see other QA |
|
2 = Majority not processed due to cloud effects |
|
3 = Majority not processed due to other effects |
| 02 Period used |
0 = 16 days |
|
1 = 32 days |
| 03-05 AM/MISR/PM* |
0 = AM |
|
1 = AM/PM |
|
2 = AM/PM/MISR |
|
3 = AM/MISR |
|
4 = PM |
|
5 = PM/MISR |
|
6 = MISR |
| 06-07 BRDF Quality |
0 = Majority full inversion |
|
1 = Majority magnitude inversion |
|
2 = Majority Bus-in DB parameters (not in use) |
|
3 = Majority Fill value |
| 08-15 Percent Land |
0-100 |
| 16-23 Percent Snow |
0-100 |
| 24-27 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 degrees |
|
15 = >75 degrees |
| 28-30 Percent Contribution |
0 = 5% or less data (land) from inputs contributed to this pixel
|
|
1 = 5% - 15% |
|
2 = 15% - 30% |
|
3 = 30% - 50% |
|
4 = 50% - 70% |
|
5 = 70% - 85% |
|
6 = 85% - 95% |
|
7 = 95% or more |
| 31 QAfill |
|
|
*AM is the original name of the of the first EOS satellite, indicative of its morning equator crossing. The platform is now called "Terra."
*PM is the original name of the second EOS satellite, indicative of its afternoon equator crossing. The platform is now called "Aqua."
*MISR is the Multi-angle Imaging Spectroradiometer, and is one of the five instruments currently flying on Terra.
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| Data Center: |
LPDAAC |
| Sensor: |
MODIS |
| Dataset: |
MODIS/Terra BRDF/Albedo Parameters 16-Day L3 Global 0.25Deg CMG |
| Geographic Extent: |
Type Lat/Long Range or Draw on Map |
| Temporal Extent: |
August 29, 2002 (2002241) - October 7, 2002 (2002280) |
Product Information
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