AOT Quality (QF1.1) 00 = 0 =High 01 = 1 = Degraded 10 = 2 = Excluded 11 = 3 = Not Produced 2 AOTNOTPRODUCED(3): Solar zenith angle > 80° Missing channel reflectance Over land: M1, M2, M3, M5, M8, M11 Over water: M5, M6, M7, M8, M10, M11 Missing ancillary model data Wind wind direction, precipitable water, surface air temperature, column ozone, surface pressure, surface height Probably or confident cloudy (from QF4.4) Snow/ice present (from QF4.1) Fire present (from QF4.4) Unfavorable surface: inland or coastal (from QF2.3) Internal test Over land: sun glint; fire; snow/ice Over water: sun glint; turbid water; snow/ice Bright surface over land Bright pixel index ()<0.05 and Reflectance at M11 > 0.3 AOTEXCLUDED(2): Use tertiary ancillary model data (obsolete) Retrieved AOT550 out of spec range [0,2] Internal test Missing channel reflectance or brightness temperature (M3,M5,M7,M8,M9,M10,M11,M12, M15, M16 over land; M3,M4,M15,M16 over water) AOTDEGRADED(1): 65° ≤ Solar zenith angle < 80° Use secondary ancillary model data (obsolete) Presence of shadow (from QF4.3); cirrus (from QF4.2); adjacent pixel cloud confidence level being probably or confidently cloudy (from QF2.2); volcanic ash (QF4.7)
Soil dominant over land (bright pixel index ≤ 0.2) Retrieval residual beyond the threshold Minimum residual > 0.05 when AOT550 > 0.5 over land Minimum residual > 0.5 when AOT550 > 0.5 over water AOTHIGH(0): otherwise Ångström Exponent Quality (QF1.2) 00 = 0 = High 01 = 1 = Degraded 10 = 2 = Excluded 11 = 3 = Not Produced 2 Set to be same as the Aerosol optical thickness quality (QF1.1) AOTNOTPRODUCED(3): Nonpositive AOT at channels used for AE calculation (M2 / M5 over land; M7 / M10 over AOTEXCLUDED(2): Out of spec range [-1.0, 3.0] AOTDEGRADED(1): Low AOT 550 (< 0.15) AOTHIGH(0): otherwise Suspended Matter Type Quality (QF1.3) 00 = 0 = High 01 = 1 = Degraded 10 = 2 = Excluded 11 = 3 = Not Produced 2 Set to be same as AOT quality flag (QF1.1) AOTNOTPRODUCED(3); AOTEXCLUDED(2); 0.15 < AOT550 < 0.5 AOTDEGRADED(1); AOTHIGH(0): if volcanic ash is detected (QF4.7), the SM type quality is set to be AOTHIGH (0) no matter what value QF1.1 is Cloud Mask Quality (QF1.4) 00 = 0 = Poor 01 = 1 = Low 10 = 2 = Medium 11 = 3 = High 2 Direct copy from VIIRS cloud mask (VCM) without modification QF2 Flag Values Bits Conditions
101 = 5 = Internal & Geometry 110 = 6 = Internal & Wind 111 = 7 = All QF4 Flag Values Bits Conditions Snow/Ice (QF4.1) 1 = Yes 0 = No 1 Initially copied from VCM, internal tests also check for snow/ice AOTQFYES (1): VCM identified or internal tests detected AOTQFNO(0): Cirrus (QF4.2) 1 = Yes 0 = No 1 Initially copied from VCM, internal also check for cirrus over land CM_CLOUD (1): VCM identified or internal test (over land) detected CM_NO_CLOUD (0) Cloud Shadow (QF4.3) 1 = Yes 0 = No 1 Copied from VCM Fire (QF4.4) 1 = Yes 0 = No 1 Initially copied from VCM, internal also check fire over land CM_FIRE (1) VCM identified or internal test (over land) detected CM_NO_FIRE (0) Bright Pixel (QF4.5) 00 = 0 = Dark 01 = 1 = Soil Dominated 10 = 2 = Bright 2 Land only AOTBRIGHT (2): Bright pixel index ()<0.05 and Reflectance at M11 > 0.3 AOTSOIL (1): Bright pixel index ≤ 0.2, soil dominated. AOTVEG (0): Initial value. Turbid/ Shallow Water (QF4.6) 1 = Yes 0 = No 1 AOTQFYES (1): Detected by internal test over water AOTQFNO (0)
Ash (QF4.7) 1 = Yes 0 = No 1 Copied from VCM AOTQFYES (1) AOTQFNO (0) QF5 Flag Values Bits Conditions Low AOT – SM Typing Excluded (QF5.1) 1 = Yes 0 = No 1 AOTQFYES (1): If 0.15 < AOT550 < 1.0 AOTQFNO (0): AOT550 ≤ 0.15 – no suspended matter AOT550 ≥ 1.0 Low AOT – SM Detection Excluded (QF5.2) 1 = Yes 0 = No 1 AOTQFYES (1): If 0.15 < AOT550 < 0.5 AOTQFNO (0): AOT550 ≤ 0.15 – no suspended matter AOT550 ≥ 0.5 AOT Out of Spec Range (QF5.3) 1 = Yes 0 = No 1 AOTQFYES (1): If AOT550 < 0.0 or AOT550 > 2.0 AOTQFNO (0) APSP Out of Spec Range (QF5.4) 1 = Yes 0 = No 1 AOTQFYES (1): If AE < -1.0 or AE > 3.0 AOTQFNO (0) Low AOT, APSP Excluded (QF5.5) 1 = Yes 0 = No 1 AOTQFYES (1): If AOT550 < 0.15 AOTQFNO (0) Residual Threshold Exceeded (QF5.6) 1 = Yes 0 = No 1 AOTQFYES (1): Minimum residual > 0.05 when AOT550 > 0.5 over land Minimum residual > 0.5 when AOT550 > 0.5 over water AOTQFNO (0) 2 Note: Spare bits EDR Quality Flags Table C.2 EDR Quality Flags QF1-5 QF1 Flag Values Bits Conditions Notes
Land, or Not Produced (QF1.3) 00 = 0 = Land 01 = 1 = Ocean 10 = 2 = Not Produced 2 Land: Number of land/desert pixels ≥ half the total good/degraded pixels within the horizontal cell Ocean: Number of sea water pixels > half the total good/degraded pixels within the horizontal cell AOT out of Spec Range (QF1.4) 1 = Yes 0 = No 1 Yes: AOT at 550 nm of any pixel in the 8x8 horizontal cell is out of spec range (0.0-2.0) APSP out of Spec Range (QF1.5) 1 = Yes 0 = No 1 Yes: APSP of any pixel in the 8x8 horizontal cell is out of spec range QF2 Flag Values Bits Conditions Notes Cloud Contamination (QF2.1) 1 = Yes 0 = No 1 Yes: Any pixel in the 8x8 horizontal cell is not confidently clear Cloud adjacent to cell (QF2.2) 1 = Yes 0 = No 1 Yes: Any pixel in the 8x8 horizontal cell has their cloud adjacency flagged as probably or confidently cloudy Cirrus Contamination (QF2.3) 1 = Yes 0 = No 1 Yes: Any pixel in the 8x8 horizontal cell has cirrus Bad SDR (QF2.4) 1 = Yes 0 = No 1 Yes: Any pixel in the 8x8 horizontal cell has bad SDR Sunglint (QF2.5) 1 = Yes 0 = No 1 Yes: Any pixel in the 8x8 horizontal cell has sunglint Cloud Shadow (QF2.6) 1 = Yes 0 = No 1 Yes: Any in the 8x8 horizontal cell has cloud shadow Snow/Ice (QF2.7) 1 = Yes 0 = No 1 Yes: Any pixel in the 8x8 horizontal cell has snow/ice Fire (QF2.8) 1 = Yes 0 = No 1 Yes: Any pixel in the 8x8 horizontal cell has fire QF3 Flag Values Bits Conditions Notes
Large Mode Aerosol Model (ocean) (QF5.2) 100 = 4 = Coarse mode 5 011 = 3 = Coarse mode 4 010 = 2 = Coarse mode 3 001 = 1 = Coarse mode 2 000 = 0 = Coarse mode 1 111 = 7 = NA (no ocean) 3 Selects the dominant large mode aerosol model (largest number of pixels involved in the EDR aggregation) over ocean; See AOT ATBD for all model details 2 Spare bits Suspended Matter Quality Table C.3 Suspended Matter Quality Flags QF1-3 QF1 Flag Values Bits Conditions Notes Suspended Matter Detection Product Quality (QF1.1) 11 = 3 = High 10 = 2 = Medium 01 = 1 = Low 00 = 0 = Not Produced 2 High: Pixel SM type quality is good Medium: Pixel SM type quality is degraded Low: SM type quality is excluded Not Produced: Pixel SM type quality is not produced Pixel SM type quality is from Aerosol IP product, it is set by default to the AOT quality (see Table C.1 for conditions) and then changed under the following conditions: Excluded: AOT at 550 nm < 0.5 Good: If volcanic ash is detected, SM type quality is reset to good no matter what the AOT quality is Suspended Matter Type Product Quality (QF1.2) 11 = 3 = High 10 = 2 = Medium 01 = 1 = Low 00 = 0 = Not Produced 2 High: Pixel SM type quality is good and "Low AOT, SM Typing Excluded" flag is not set (AOT at 550 nm ≤ 0.15 (no SM) or AOT at 550 nm ≥ 1.0) Medium: Pixel SM type quality is degraded and Pixel SM type quality is from Aerosol IP product, it is set by default to the AOT quality and then changed under the following conditions:
Contamination (QF2.1) 1 = Yes 0 = No 1 Yes: Pixel is not confidently clear Cloud adjacent to cell (QF2.2) 1 = Yes 0 = No 1 Yes: Pixel adjacent cloud flag is confident or probably cloudy Cirrus Contamination (QF2.3) 1 = Yes 0 = No 1 Copied from Aerosol IP Cirrus Quality Flag Bad SDR (QF2.4) 1 = Yes 0 = No 1 Copied from Aerosol IP Bad SDR Quality Flag Sunglint (QF2.5) 1 = Yes 0 = No 1 Yes: Pixel has sunglint flag set Shadow (QF2.6) 1 = Yes 0 = No 1 Copied from Aerosol IP Shadow Quality Flag Snow/Ice (Q2.7) 1 = Yes 0 = No 1 Copied from Aerosol IP Snow/Ice Quality Flag Fire (QF2.8) 1 = Yes 0 = No 1 Copied from Aerosol IP Fire Quality Flag QF3 Flag Values Bits Conditions Notes Smoke Concentration out of Expected Range (QF3.1) 1 = Yes 0 = No 1 Yes: Pixel smoke concentration is beyond the expected range (0-1000 µg/m3) Excluded SM typing (QF3.2) 1 = Yes 0 = No 1 Copied from the Aerosol IP SM Typing Excluded Quality Flag Excluded SM Detection (Q3.3) 1 = Yes 0 = No 1 Copied from the Aerosol IP SM Detection Excluded Quality Flag
Low Sun (QF3.4) 1 = Yes 0 = No 1 Yes: IP day/night flag is set to 'Low sun, degraded' (65º < Solar zenith angle ≤ 80º) Day/Night flag is from Aerosol IP Product Bright Surface/ Shallow or Turbid Water (QF3.5) 1 = Yes 0 = No 1 Yes: IP bright pixel or turbid/shallow water flag is set Bright Surface and Turbid/Shallow Water flag is from Aerosol IP Product 3 Spare bits