Following the discussion between Delft Hydraulics and CEH & Wallingford Software on Friday 2 May 2003 in Wallingford on providing an enumeration of quality flags as a part of the SIS, a proposed quality flag enumeration is given in the table below. As described in the timeseries XML schemas provided we have made allowance for a single quality flag. This is contrary to the EA XML interchange formats which provide for three separate quality flags. A single flag seems more appropriate to the level of communication we are dealing with and should avoid ambiguity. The flags are single byte values and are incorporated in the XML Schema for time series. Quality flags are provided for each data point.
Quality flags are constructed on a philosophy of two qualifiers. The first described the origin of the data and the second the qualityTime series flags describe the origin and the quality of the data.
Possible origins of data are:
1. Original- Original: This entails the data value is the original value. It has not been amended by Delft-FEWS
2. Completed- Completed: This entails the original value was missing and was replaced by a non-missing value.
3. Corrected- Corrected: This entails the original value was replaced with another non-missing value.
Possible qualifiers Qualities are:
4. Reliable- Reliable: Data is reliable and valid
5. Doubtful- Doubtful: The validity of the data value is uncertain
6. Unreliable- Unreliable: The data value is unreliable and cannot be used for calculations like transformations or external models. It can still be viewed and exported with a regular exportModule as long as the unreliable flag is shown with it.
Following this specification, the table below gives an overview of quality flag enumerations
Table D.1 Enumeration of quality flags
Enumeration | Description |
0 | Original/Reliable |
1 | Corrected/Reliable |
2 | Completed/Reliable |
3 | Original/Doubtful |
4 | Corrected/Doubtful |
5 | Completed/Doubtful |
6 | Missing/Unreliable |
7 | Corrected/Unreliable |
8 | Completed/Unreliable |
9 | Missing value in originally observed series. Note this is a special form of |
Original/Unreliable. Missing values are automatically unreliable | |
10 | Deleted Only used for non-equidistant series when timestep is deleted |
11, 12, 13 | Not used |
14 | Reset Used for rainfall data processing when the storage is reset (canister reset) |
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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: secondary validation, series comparison
- FC: secondary validation, flag comparison
- MK: 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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