Oceanographic quality flag schemes and mappings between them
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1 Oceanographic quality flag schemes and mappings between them Version: 1.4 Reiner Schlitzer, Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany. Following below are the quality flag code definitions of 16 widely used oceanographic flagging schemes (in black) as well as the mappings between them (in gray), as implemented in the Ocean Data View software. History: (v1.1): Quality flag mappings to/from,, and flag "5" changed (v1.2): Missing value flag mappings between many schemes modified. scheme added (v1.3): SeaDataNet weblink updated (v1.4) quality flag scheme added 1
2 QFSetName= Set Description: generic quality flags Reference: Users Guide, STATION good quality blank blank blank 1 1 unknown quality blank * blank 0 2 questionable quality K?? 3 3 bad quality K? B 4 4 2
3 QFSetName= Set Description: quality flags Reference: STATION no quality control (QC) was performed Q * blank 0 2 QC was performed; good data blank blank blank 1 1 QC was performed; probably good data blank blank blank 2 1 QC was performed; probably bad data K?? 3 3 QC was performed; bad data K / B 4 4 the value was changed as a result of QC R * 5 2 the value is missing N * B 9 9 3
4 QFSetName= Set Description: quality flags Reference: Argo data management, User s manual, Version 2.1, STATION no QC was performed Q * blank 0 2 good data blank blank blank 1 1 probably good data blank blank blank 2 1 probably bad data that are potentially correctable K?? 3 3 bad data K / B 4 4 value changed R * 5 2 interpolated value T * 8 2 missing value N * B 9 9 4
5 QFSetName= Set Description: quality flags Reference: STATION no quality control Q * blank 0 2 good value blank blank blank 1 1 probably good value blank blank blank 2 1 probably bad value K?? 3 3 bad value K / B 4 4 changed value R * 5 2 value below detection < < < 0 2 value in excess > > > 0 2 interpolated value T * 0 2 missing value N * B 9 9 value phenomenon uncertain A Q * B 0 2 5
6 QFSetName= Set Description: European Sea Level Service quality flags Reference: STATION no quality control Q * blank 0 2 correct value blank blank blank 1 1 interpolated value T * 0 2 doubtful value K?? 3 3 isolated spike or wrong value K / B 4 4 correct but extreme value blank blank blank 1 1 reference change detected U * B 0 2 constant values for more than a defined time interval Q * B 0 2 out of range K? B 3 3 missing value N * B 9 9 6
7 QFSetName= Set Description: World Ocean Database individual observed level quality flags Reference: ftp://ftp.nodc.noaa.gov/pub/05/doc/wod05_tutorial.pdf STATION accepted value blank blank blank 1 1 range outlier (outside of broad range check) K?? 3 3 failed inversion check K?? 3 3 failed gradient check K?? 3 3 observed level "bullseye" flag and zero gradient check K?? 3 3 combined gradient and inversion checks K?? 3 3 failed range and inversion checks K / B 4 4 failed range and gradient checks K / B 4 4 failed range and questionable data checks K / B 4 4 failed range and combined gradient and inversion checks K / B 4 4 7
8 QFSetName= STATION Set Description: World Ocean Database entire station quality flags Reference: ftp://ftp.nodc.noaa.gov/pub/05/doc/wod05_tutorial.pdf STATION accepted station blank blank blank 1 1 failed annual standard deviation check K?? 3 3 two or more density inversions (Levitus, 1982 criteria) K?? 3 3 flagged cruise K?? 3 3 failed seasonal standard deviation check K?? 3 3 failed monthly standard deviation check K?? 3 3 failed annual and seasonal standard deviation check K?? 3 3 bull s-eye from standard level data or failed annual and monthly standard deviation check K?? 3 3 failed seasonal and monthly standard deviation check K?? 3 3 failed annual, seasonal and monthly standard deviation check K?? 3 3 8
9 QFSetName= Set Description: WOCE WHP bottle parameter data quality flags Reference: STATION sample for this measurement was drawn from water bottle but analysis not received blank * blank 9 9 acceptable measurement blank blank blank 1 1 questionable measurement K?? 3 3 bad measurement K / B 4 4 not reported blank blank blank 9 9 mean of replicate measurements blank * blank 0 2 manual chromatographic peak measurement blank * blank 0 2 irregular digital chromatographic peak integration K?? 3 3 sample not drawn for this measurement from this bottle N * B 9 9 QFSetName= 9
10 Set Description: WOCE WHP CTD data quality flags Reference: STATION not calibrated blank * blank 0 2 acceptable measurement blank blank blank 1 1 questionable measurement K?? 3 3 bad measurement K / B 4 4 not reported blank blank blank 9 9 interpolated over >2 dbar interval blank * blank 0 2 despiked blank * blank 0 2 not sampled N * B
11 QFSetName= Set Description: WOCE WHP quality flags for the water bottle itself Reference: STATION bottle information unavailable blank * blank 0 2 no problems noted blank blank blank 1 1 leaking K?? 3 3 did not trip correctly K?? 4 4 not reported blank blank blank 9 9 significant discrepancy in measured values between Gerard and Niskin bottles K?? 3 3 unknown problem K?? 3 3 pair did not trip correctly K?? 3 3 samples not drawn from this bottle N * B
12 QFSetName= Set Description: quality flags. Not definitive yet. Reference: STATION missing data N blank blank 9 9 quality not evaluated blank blank blank 0 2 bad K / B 4 4 questionable/suspect K?? 3 3 good blank blank blank
13 QFSetName= Set Description: One of the following quality control flags may appear against an individual data value. A blank flag indicates that the value is good. Reference: STATION acceptable value blank blank blank 1 1 below detection limit < < < 3 2 in excess of quoted value > > > 3 2 taxonomic flag for affinis (aff.) A blank blank 0 2 beginning of CTD down/up cast B blank blank 0 2 taxonomic flag for confer (cf.) C blank blank 0 2 thermometric depth D blank blank 0 2 end of CTD down/up cast E blank blank 0 2 extrapolated value H blank blank 0 2 taxonomic flag for single species (sp.) I blank blank 0 2 improbable value, unknown quality control source K?? 3 3 improbable value, originators quality control L??
14 improbable value, quality control M?? 3 3 null value N blank blank 0 2 improbable value, user quality control O?? 3 3 trace/calm P blank blank 0 2 indeterminate Q blank blank 0 2 replacement value R blank blank 0 2 estimated value S blank blank 0 2 interpolated value T blank blank 0 2 uncalibrated U blank blank 0 2 control value W blank blank 0 2 excessive difference X blank blank
15 QFSetName= Set Description: QF symbols are prefixes to data values (no blank in between). Values without any QF symbol are qualified as being valid. Reference: STATION valid blank blank blank 1 1 questionable K?? 3 3 not valid K / B 4 4 unknown blank * blank 0 2 individual definition (e.g. missing value) blank # blank 0 2 larger than > > > 3 2 less than < < <
16 QFSetName= Set Description: Swedish Meteorological and Hydrographic Institute quality flags Reference: STATION good value blank blank blank 1 1 extreme/suspicious value, checked manually and compared with other relevant parameters blank blank! 1 1 and found correct questionable value K?? 3 3 bad value K / B 4 4 below detection limit / less than < < < 3 2 above detection limit / greater than > > > 3 2 manually interpolated /extrapolated T blank 0 2 value from CTD temp/salin/fluor/oxyg blank blank C 0 2 zero by definition K? Z
17 QFSetName= OCEANSITES Set Description: quality flags Reference: STATION no QC was performed Q * blank 0 2 good data blank blank blank 1 1 probably good data blank blank blank 2 1 bad data that are potentially correctable K?? 3 3 bad data K / B 4 4 value changed R * blank 5 2 nominal value R * blank 7 2 interpolated value R * 8 2 missing value N * B
18 QFSetName= Set Description: quality flag scheme Reference: STATION good quality blank blank blank 1 1 not evaluated, not available or unknown quality blank * blank 0 2 questionable/suspect quality K?? 3 3 bad quality K / B 4 4 missing data K / B
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