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Display
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ensembles
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and
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statistics
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Summary
DELFT-FEWS
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can
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deal
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with
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ensemble
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forecast
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for
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some
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time
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already.
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More
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recently
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extended
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ensemble
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statistics
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and
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area
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display
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options
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have
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been
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added.
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The
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display
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ensemble
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results
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as
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areas
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two
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steps
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are
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needed:
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- Determine
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- statistical
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- parameter
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- of
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- the
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- ensemble
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- (min/max/percentiles)
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- Use
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- these
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- to
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- draw
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- an
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- area
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- in
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- the
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- DisplayGroups
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- file
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(Ensemble)
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statistics
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This
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is
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a
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new
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feature
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in
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the
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transformation
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utility.
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This
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way
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you
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can
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in
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a
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single
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command
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determine
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the
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max/min
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for
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all
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the
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members
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in
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an
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ensemble
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or
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a
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percentile.
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As
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with
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all
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functions
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in
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the
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transformation
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utility
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the
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way
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to
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use
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this
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is
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o
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(1)
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define
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an
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import
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variable.
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This
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can
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be
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a
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number
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of
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timeseriesSets
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but
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also
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an
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ensemble.
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(2)
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Define
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the
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(statistical)
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function.
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And
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(3)
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define
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the
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timeseriesSet
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to
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store
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the
...
results.
The following functions are available:
• max
• min
• kurtosis
• mean
• median
• percentile
• quartile
• rsquared
• skewness
• standardDeviation
• variance
For some functions an extra attribute (value) should be used. E.g. for the percentile function the percentile should be given. An example configuration is shown below:
| Code Block | ||||
|---|---|---|---|---|
| ||||
!stat.png! The following functions are available: • max • min • kurtosis • mean • median • percentile • quartile • rsquared • skewness • standardDeviation • variance For some functions an extra attribute (value) should be used. E.g. for the percentile function the percentile should be given. An example configuration is shown below: {code:xml} <transformationSet transformationId="Q33"> <inputVariable variableId="Q"> <timeSeriesSet> <moduleInstanceSetId>TCM</moduleInstanceSetId> <valueType>scalar</valueType> <parameterId>Q.simulated.forecast</parameterId> <locationSetId>HydrologicalTCMModels</locationSetId> <timeSeriesType>simulated forecasting</timeSeriesType> <timeStep unit="minute" multiplier="15"/> <relativeViewPeriod unit="hour" start="-12" end="36"/> <readWriteMode>read only</readWriteMode> <ensembleId>MOGREPS</ensembleId> </timeSeriesSet> </inputVariable> <statistics> <function outputVariableId="Q33" inputVariableId="Q" function="percentile" value="33"/> </statistics> <outputVariable variableId="Q33"> <timeSeriesSet> <moduleInstanceId>MOGREPS_TCM_Statistics</moduleInstanceId> <valueType>scalar</valueType> <parameterId>Q.simulated.forecast.33</parameterId> <locationSetId>HydrologicalTCMModels</locationSetId> <timeSeriesType>simulated forecasting</timeSeriesType> <timeStep unit="minute" multiplier="15"/> <relativeViewPeriod unit="hour" start="-12" end="36"/> <readWriteMode>read only</readWriteMode> </timeSeriesSet> </outputVariable> </transformationSet> {xml} h3. Displaying ensemble results Within NFFS ensembles can be displayed as 'spagetti |
Displaying ensemble results
Within NFFS ensembles can be displayed as 'spagetti plot's'
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However,
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as
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these
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are
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a
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bit
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hard
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to
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digest
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one
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can
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also
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use
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the
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statistics
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(max/min/
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percentiles)
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to
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display
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the
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forecast
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results
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as
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areas.
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These area graphs can only be made as pre-defined
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displays
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i.e.
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in
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the
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DisplayGroups
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file
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in
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the
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SystemConfigFiles
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directory.
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The areas are configured by entering timeseriesSets in the area element. As a results the area between the max and min values for each time are filled with a single color. The areas are always displayed behind the other lines. The area is painted on top of areas already specified, so specify the largest areas first. As the areas are painted on top of the lines you should also specify an opaquenessPercentage < 100% to make sure the lines remain visible.