QGIS TUFLOW Apply Stability Styling: Difference between revisions
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=====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")''<br>
: [[File: negative_results_example.PNG | 450px]]<Br>▼
* Rule 2: Flag as unstable if the minimum and maximum values occur within a certain timeframe of each other▼
* Rule
: [[File: min_max_close_in_time_example.PNG | 450px]]<br>▼
* Rule
: [[File: max_not_close_to_ts_example.PNG | 450px ]]<br>▼
▲* Rule
: [[File: min_max_close_in_time_example.PNG | 450px ]]<br>
* Rule 5: Flag as unstable if a number time series 'bounces' with a magnitude greater than a given value exceed a given count
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'''<tt>UNSTABLE_PERC_LIMIT</tt>'''<br>
<Br><Br>
* Detailed Description Rule 1: Flag as unstable if the minimum value is less than zero ''(only applied to "Possibly Unstable")''
▲[[File: negative_results_example.PNG | 450px]]<Br>
* Detailed Description Rule 2: Flag as unstable if the minimum and maximum values occur within '''<tt>FORWARD_LOOK_COUNT</tt>''' number of timesteps. This will not be flagged if the minimum value occurs at the first timestep.
▲[[File: min_max_close_in_time_example.PNG | 450px]]<br>
* Detailed Description Rule 3: The following rule uses a <tt>'''TOLERANCE'''</tt> defined as
<pre>TOLERANCE = PERC_DIFF_BETWEEN_MAX_AND_TS multiplied by the time series range (time series max - time series min).</pre>
: Flag as unstable if the max value is outside of the time series by '''<tt>TOLERANCE</tt>''' (outside means either not close to any of the data points or an interpolated value if the time of max falls inbetween data points)<br>
* Detailed Description Rule 4: Same as rule 3 however with the minimum value rather than the maximum value
▲[[File: max_not_close_to_ts_example.PNG | 450px ]]<br>
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