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MODIS Aqua Thermal Anomalies/Fire Daily 1km 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/MYD14.A1fs .
The Thermal Anomalies/Fire products include a QA SDS called "Algorithm QA of most confident detected fire." 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 are empty) | |
| 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 | 20 K TD test (logic b) |
| 0 = fail | |
| 1 = pass | |
| 12 | 320 K T21 test (logic B) |
| 0 = fail | |
| 1 = pass | |
| 13 | TDB test (logic a) |
| 0 = fail | |
| 1 = pass | |
| 14 | T21B test (logic A) |
| 0 = fail | |
| 1 = pass | |
| 15 | 360 K T21 test (logic X) |
| 0 = fail | |
| 1 = pass | |
| 16-20 | spare (set to 0) |
| 21-22 | 0.86 micron covariance index (surface heterogeneity) |
| 00 = undetermined | |
| 01 = low | |
| 10 = medium | |
| 11 = high | |
| 23 | MOD35 status |
| 0 = unavailable / no determination | |
| 1 = available | |
| 24 | 250 m cloud flag (valid only if bit 23 is set) |
| 0 = no | |
| 1 = yes | |
| 25-31 | spare (set to 0) |
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