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V005 MODIS 8-Day Surface Reflectance 250m QA Science Data Sets
The QA information below is excerpted from an HDF-EOS file of the MODIS Surface Reflectance product MOD09Q1.
Table 1: MOD09Q1.005 250-meter Surface Reflectance Data QA Descriptions (16-bit)
| Bit No. | Parameter Name | Bit Comb. | Sur_refl_qc_250m |
|---|---|---|---|
| 15 | spare (unused) | - | --- |
| 14 | different orbit from 500 m | 1 | yes |
| 0 | no | ||
| 13 | adjacency correction performed | 1 | yes |
| 0 | no | ||
| 12 | atmospheric correction performed | 1 | yes |
| 0 | no | ||
| 8-11 | band 2 data quality four bit range | 0000 | highest quality |
| 1000 | dead detector; data copied from adjacent detector | ||
| 1001 | solar zenith >= 86 degrees | ||
| 1010 | solar zenith >= 85 and < 86 degrees | ||
| 1011 | missing input | ||
| 1100 | internal constant used in place of climatological data for at least one atmospheric constant | ||
| 1101 | quality so low that it is not useful | ||
| 1110 | L1B data faulty | ||
| 1111 | not useful for any other reason or not processed due to deep ocean or clouds | ||
| 4-7 | band 1 data quality four bit range | SAME AS ABOVE | |
| 2-3 | cloud state | 00 | clear |
| 01 | cloudy | ||
| 10 | mixed | ||
| 11 | not set; assumed clear | ||
| 0-1 | MODLAND QA bits | 00 | corrected product produced at ideal quality all bands |
| 01 | corrected product produced at less than ideal quality some or all bands | ||
| 10 | corrected product not produced due to cloud effects all bands | ||
| 11 | corrected product not produced due to other reasons some or all bands may be fill value [Note that a value of (11) overrides a value of (01)]. |
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