 |
||||||||
| Home | About | Products | Data Tools | Order Data | News | Help/Edu | Links | Contact Us |
MODIS BRDF/Albedo 1km 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 (MOD43BX) and Combined (MCD43BX) products.
The following QC SDSs are associated with each product.
43B1 BRDF_Quality
43B3 BRDF_Albedo_Quality
43B4 Nadir_Reflectance_Quality
The SDSs contain two QC "words." Num_QC_Words #1 is encoded as 32-bit unsigned integers and holds band-averaged quality and inversion status information and band-independent data (bits 00-01 are the MODLAND mandatory QA). Num_QC_Words #2 is encoded as 32-bit unsigned integers and holds band-specific quality and inversion status information
| QC Word One (band independent) |
Description |
|---|---|
| 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 *see below | 0 = AM 1 = AM/PM 2 = AM/PM/MISR 3 = AM/MISR 4 = PM 5 = PM/MISR 6 = MISR |
| 11-15 Mean Solar Angle of the Overpass Time | 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 |
| QC Word Two (band dependent) |
Description |
| 00-03 Band 1 Quality | 0 = RMSE good, WoD(NBAR) good, WoD(WSA) good 1 = RMSE good, WoD(NBAR) good, WoD(WSA) moderate 2 = RMSE good, WoD(NBAR) moderate, WoD(WSA) good 3 = RMSE good, WoD(NBAR) moderate, WoD(WSA) moderate 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 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 |
*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.
| LP DAAC | EROS Home | About | Products | Data Tools | Order Data | News | Help/Edu | Links | Contact Us |
| This site is hosted by the USGS - NASA Distributed Active Archive Center U.S. Government: Public Information Exchange Resource NASA: Privacy Policy and Important Notices USGS: Privacy Statement, Disclaimer, Accessibility, FOIA DOI: Privacy Statement, Privacy Disclaimer, No FEAR Act, FOIA, Performance Plan, Children's Privacy URL: http://LPDAAC.usgs.gov/modis/qa/mocd43b_qa_v4.asp Technical Contact: LPDAAC@eos.nasa.gov Last Update: Tuesday, April 25, 2006 Download Adobe Acrobat Reader |
 |
