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MODIS BRDF/Albedo CMG QA Science Data Sets
The QA information below is excerpted from the MODIS BRDF/Albedo Users Guide available on-line at http://www-modis.bu.edu/brdf/userguide/index.html. This information applies to Terra (MOD43CX) and Combined (MCD43X) products.
The following QC SDSs are associated with each product. The SDSs are encoded as 32-bit unsigned integers and are described below.
43C1 Albedo_Quality
43C2 Albedo_Quality
43C3 Nadir_Reflectance_Quality
| 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 *see below | 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 currently used) | |
| 3 = Majority Fill value | |
| 08-15 Percent Inputs | 0-100 (percent of the processed finer resolution data contributed to this CMG pixel) |
| 16-23 Percent Snow | 0-100 |
| 24-27 Local Solar Noon | 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 degree | |
| 28-30 TBD | |
| 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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