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Table D.1 Enumeration of quality flags
Enumeration | Description |
0 | Original/Reliable The data value is the original value retrieved from an external source and it successfully passes all validation criteria set. |
1 | Corrected/Reliable The original value was removed and corrected. Correction may be through interpolation or manual editing. |
2 | Completed/Reliable Original value was missing. Value has been filled in through interpolation, transformation (e.g. stage discharge) or a model. |
3 | Original/Doubtful Observed value retrieved from external data source. Value is valid, but marked as suspect due to soft validation limits being exceeded. |
4 | Corrected/Doubtful The original value was removed and corrected. However, the corrected value is doubtful due to validation limits. |
5 | Completed/Doubtful Original value was missing. Value has been filled in as above, but resulting value is doubtful due to limits in transformation/interpolation or input value used for transformation being doubtful. |
6 | Missing/Unreliable Observed value retrieved from external data source. Value is invalid due to validation limits set. Value is removed |
7 | Corrected/Unreliable The original value was removed and corrected. However, corrected value is unreliable and is removed. |
8 | Completed/Unreliable Original value was missing. Value has been filled in as above, but resulting value is unreliable and is removed. |
9 | Missing value in originally observed series. Note this is a special form of Original/Unreliable. Missing values are automatically unreliable |
Next to the flag it is also possible to get or set information why the flag is as it is through the so-called flagSource. Since version 2012.01 FEWS stores not only the quality flags, but also the source of the flag, the so-called flagSource. So the user is able to see why a certain value is validated as unreliable, eg. due to exceeding of the hard max.
The list of flagSources is:
- IMP: flag is imported
- SN: soft min.
- HN: hard min.
- SX: soft max.
- HX: hard max.
- ROR: rate of rise
- ROF: rate of fall
- SR: same reading
- TS: temporary shift
- OSC: oscillation
- SC: secundairy secondary validation, series comparison
- FC: secundairy secondary validation, flag comparison
- MK: secundairy secondary validation, Mann-Kendall test
- SVP: secondary valdidation, Flag persistency (FlagPersistencyCheck)
- SFP: start flag persistency
- MAN: manual edit
- MK: mann kendall
- CA: Conditional aggregation
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