Difference between revisions of "QGIS TUFLOW Apply Stability Styling"
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* Minimum value (from every timestep) and the time of minimum | * Minimum value (from every timestep) and the time of minimum | ||
* Time series information - this can be slightly different from the results exported to the 'plot' folder as it will reduce the number of outputs to ensure it conforms with GIS attribute limits | * Time series information - this can be slightly different from the results exported to the 'plot' folder as it will reduce the number of outputs to ensure it conforms with GIS attribute limits | ||
| + | |||
| + | =====Rules===== | ||
| + | The rules to categorise 'Likely Unstable' and 'Possibly Unstable' are very similar and the main difference is that they use different sensitivities. The parameters determining how sensitive each is can be modified by the user. The basic rules as follows, a more detailed description and how to change the sensitivity can be found further below: | ||
| + | * Rule 1: Flag as unstable if the minimum value is less than zero ''only applied to "Possibly Unstable"'' | ||
| + | * Rule 2: Flag as unstable if the minimum and maximum values occur within a certain timeframe of each other | ||
| + | * Rule 3: Flag as unstable if the maximum value falls outside of the time series values by a certain amount | ||
| + | * Rule 4: Flag as unstable if the minimum value falls outside of the time series values by a certain amount | ||
| + | * Rule 5: Flag as unstable if a number time series 'bounces' with a magnitude greater than a given value exceed a given count | ||
Revision as of 23:28, 12 May 2022
This tool styles the selected layer using a 'traffic light' method to indicate where instabilities could be occurring. This tool currently only supports the _TS.mif (_TS_P.shp) 1D output, however it is intended to expand the scope of this tool in future releases to other inputs and outputs to help with model checking.
Introduced in version 3.3.1'
Running the Tool
The tool can be run by clicking the dropdown arrow next to the 'Apply TUFLOW Style to Current Layer' on the toolbar:
Description
The tool uses a 'traffic light' system to indicate where results may be unstable:
The following rules are applied to determine the which category each feature falls within:
_TS_P Output
The _TS_P.shp (_TS.mif) is a 1D timeseries output for Q, V, and H, and includes the following information:
- Maximum value (from every timestep) and the time of maximum
- Minimum value (from every timestep) and the time of minimum
- Time series information - this can be slightly different from the results exported to the 'plot' folder as it will reduce the number of outputs to ensure it conforms with GIS attribute limits
Rules
The rules to categorise 'Likely Unstable' and 'Possibly Unstable' are very similar and the main difference is that they use different sensitivities. The parameters determining how sensitive each is can be modified by the user. The basic rules as follows, a more detailed description and how to change the sensitivity can be found further below:
- Rule 1: Flag as unstable if the minimum value is less than zero only applied to "Possibly Unstable"
- Rule 2: Flag as unstable if the minimum and maximum values occur within a certain timeframe of each other
- Rule 3: Flag as unstable if the maximum value falls outside of the time series values by a certain amount
- Rule 4: Flag as unstable if the minimum value falls outside of the time series values by a certain amount
- Rule 5: Flag as unstable if a number time series 'bounces' with a magnitude greater than a given value exceed a given count