Map Argo QC flags to Qartod QC flags

[tcarval]

Argo QC flags are documented in RR2 and RD2 reference tables.
Qartoq QC flags scale is documented in http://dx.doi.org/10.25923/w8y6-d298

RR2 and RD2 Argo QC flags should be mapped to Qartod QC flag.

Here is the mapping proposal

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n	Meaning	Real-time comment	Delayed-mode comment	qartod flag	qartod meaning
0	No QC is performed	No QC is performed.	No QC is performed.	2	Not evaluated
1	Good data	Good data. All Argo real-time QC tests passed. These measurements are good within the limits of the Argo real-time QC tests.	Good data. No adjustment is needed, or the adjusted value is statistically consistent with good quality reference data. An error estimate is supplied.	1	Pass
2	Probably good data	Probably good data. These measurements are to be used with caution.	Probably good data. Delayed-mode evaluation is based on insufficient information. An error estimate is supplied.	3	Suspect or Of High Interest
3	Probably bad data that are potentially adjustable	Probably bad data. These measurements are not to be used without scientific adjustment, e.g. data affected by sensor drift but may be adjusted in delayed-mode.	Probably bad data. An adjustment may (or may not) have been applied, but the value may still be bad. An error estimate is supplied.	3	Suspect or Of High Interest
4	Bad data	Bad data. These measurements are not to be used. A flag '4' indicates that a relevant real-time qc test has failed. A flag '4' may also be assigned for bad measurements that are known to be not adjustable, e.g. due to sensor failure.	Bad data. Not adjustable. Adjusted data are replaced by FillValue.	4	Fail
5	Value changed	Value changed	Value changed	1	Pass
6	Not used	Not used	Not used	-	-
7	Not used	Not used	Not used	-	-
8	Estimated value	Estimated value (interpolated, extrapolated or other estimation).	Estimated value (interpolated, extrapolated or other estimation).	1	Pass
9	Missing value	Missing value. Data parameter will record FillValue.	Missing value. Data parameter will record FillValue.	9	Missing data
‘ ‘	FillValue	Empty space in NetCDF file.	Empty space in NetCDF file.	-	-

[tcarval]

@danibodc is the Qartod QC flag scale available on NVS ? If yes, it will be easy to perform the mapping.

[tcarval]

@CandiceAOML , would you agree to check the Argo-Qartod QC flags mapping ?

[CandiceAOML]

@CandiceAOML , would you agree to check the Argo-Qartod QC flags mapping ?

@tcarval Sure! I'll share with the AOML DAC and we'll respond asap. Thanks!

[danibodc]

@tcarval there is an entry in the L27 collection 'SeaVoX data quality control flagging conventions' defining Qartod flags as a type of flagging convention, but the individual flags themselves aren't defined anywhere on the NVS as far as I can tell. So a new collection would be needed.

https://vocab.nerc.ac.uk/collection/L27/current/QARTOD_QC/

[CandiceAOML]

@tcarval Hi Thierry! We at the AOML DAC agree with your Argo-QARDOD mapping. Thanks for working on this!

[tcarval]

@danibodc can you create this new collection ? Maybe along SeaDataNet collections (P39 ?)

• QARTOD flagging definitions, reference http://dx.doi.org/10.25923/w8y6-d298

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Qartod flag	meaning	description
1	Pass	Data have passed critical real-time quality control tests and are deemed adequate for use as preliminary data.
2	Not evaluated	Data have not been QC-tested, or the information on quality is not available.
3	Suspect or Of High Interest	Data are considered to be either suspect or of high interest to data providers and users. They are flagged suspect to draw further attention to them by operators.
4	Fail	Data are considered to have failed one or more critical real-time QC checks. If they are disseminated at all, it should be readily apparent that they are not of acceptable quality.
9	Missing data	Data are missing; used as a placeholder.

[vturpin]

I would like to bring to your attention this work about QC mapping that may be usefull here : https://odv.awi.de/fileadmin/user_upload/odv/docs/ODV_quality_flag_sets.pdf