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changes.mady.by.user Camiel van Breugel

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Display ensembles and statistics

Summary

DELFT-FEWS can deal with ensemble forecast for some time already. More recently extended ensemble statistics and area display options have been added.
The display ensemble results as areas two steps are needed:

  1. Determine statistical parameter of the ensemble (min/max/percentiles)
  2. Use these to draw an area in the DisplayGroups file

(Ensemble) statistics

This is a new feature in the transformation utility. This way you can in a single command determine the max/min for all the members in an ensemble or a percentile. As with all functions in the transformation utility the way to use this is o (1) define an import variable. This can be a number of timeseriesSets but also an ensemble. (2) Define the (statistical) function. And (3) define the timeseriesSet to store the results.

...

Code Block
xml
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>

Displaying ensemble results

Within NFFS ensembles can be displayed as 'spagetti plot's' However, as these are a bit hard to digest one can also use the statistics (max/min/ percentiles) to display the forecast results as areas.

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