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MODIS Terra Thermal Anomalies/Fire Swath QA Science Data Set
The QA information below is excerpted from the MODIS Thermal Anomalies/Fire File Specification available on-line at ftp://modular.nascom.nasa.gov/pub/LatestFilespecs/MOD14.fs .
The Thermal Anomalies/Fire products include a QA SDS called "Algorithm QA." The QA information is encoded in 32-bit unsigned integers.
| Bit | Description |
| 0-1 | MODLAND QA bits |
| 00 = fire/no-fire determined at optimum confidence | |
| 01 = fire/no-fire determined at less than optimum confidence | |
| 10 = no determination made due to cloud cover | |
| 11 = no determination made due to other reason(s) | |
| 2 | 3.9 micron high-gain flag |
| 0 = band 21 used | |
| 1 = band 22 used | |
| 3 | atmospheric correction |
| 0 = not performed | |
| 1 = performed | |
| 4 | day/night algorithm |
| 0 = night | |
| 1 = day | |
| 5 | potential fire pixel |
| 0 = no (if no, remaining QA fields except bit 23 are not set) | |
| 1 = yes | |
| 6 | fire detection overturned due to sun glint |
| 0 = no | |
| 1 = yes | |
| 7-10 | background window size parameter, R |
| R = 0: unable to characterize background | |
| R > 0: background characterized with (2R+1) by (2R+1) window | |
| 11 | 360 K T21 test |
| 0 = fail | |
| 1 = pass | |
| 12 | DT relative test i |
| 0 = fail | |
| 1 = pass | |
| 13 | DT absolute test ii |
| 0 = fail | |
| 1 = pass | |
| 14 | T21 relative test |
| 0 = fail | |
| 1 = pass | |
| 15 | T31 relative test |
| 0 = fail | |
| 1 = pass | |
| 16 | background fire T21 deviation test |
| 0 = fail | |
| 1 = pass | |
| 17-20 | spare (set to 0) |
| 21 | adjacent cloud pixel (valid only if fire mask = 7, 8, or 9) |
| 0 = no | |
| 1 = yes | |
| 22 | adjacent water pixel (valid only if fire mask = 7, 8, or 9) |
| 0 = no | |
| 1 = yes | |
| 23 | sun-glint level(0-3) |
| 24 | sun glint rejection flag |
| 0 = false | |
| 1 = true | |
| 25 | hot-surface boundary rejection flag |
| 0 = false | |
| 1 = true | |
| 26 | coastal false alarm rejection flag |
| 0 = false | |
| 1 = true | |
| 27-31 | spare (set to 0) |
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