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Description

Set of rules to allow selection of minimum values from an input time series.

Input

Timeseries

Options

An optional attribute "selectNumberOfLowestMin" may be defined. The value attribute defines the number of lowest minimum values which will be written to the output timeseries.
The periodTransformation may be applied to this transformation (see Configuration example 2 below).

Output

Timeseries containing the selection of minimum values.

Configuration example 1

<transformation id="minimum function test">
   <selection>
      <minimum>
         <inputVariable>
            <timeSeriesSet>
               <moduleInstanceId>SelectionMinimumFunctionTest</moduleInstanceId>
               <valueType>scalar</valueType>
               <parameterId>H.tidal</parameterId>
               <locationId>H-2010</locationId>
               <timeSeriesType>external historical</timeSeriesType>
               <timeStep unit="minute" multiplier="15"/>
               <relativeViewPeriod unit="day" start="0" end="365"/>
               <readWriteMode>editing visible to all future task runs</readWriteMode>
            </timeSeriesSet>
         </inputVariable>
         <outputVariable>
            <timeSeriesSet>
               <moduleInstanceId>SelectionMinimumFunctionTest</moduleInstanceId>
               <valueType>scalar</valueType>
               <parameterId>H.updated</parameterId>
               <locationId>H-2010</locationId>
               <timeSeriesType>external historical</timeSeriesType>
               <timeStep unit="nonequidistant"/>
               <relativeViewPeriod unit="day" start="-5" end="15"/>
               <readWriteMode>add originals</readWriteMode>
            </timeSeriesSet>
         </outputVariable>
      </minimum>
   </selection>
</transformation>

In this example:

The lowest minimum value is returned by the output time series.

Configuration example 2

<transformation id="period minimum function test">
	<periodTransformation>
		<period>
			<season>
				<startMonthDay>--04-01</startMonthDay>
				<endMonthDay>--03-31</endMonthDay>
			</season>
		</period>
		<selection>
			<minimum>
				<inputVariable>
					<timeSeriesSet>
						<moduleInstanceId>Import</moduleInstanceId>
						<valueType>scalar</valueType>
						<parameterId>RH_24H</parameterId>
						<locationSetId>KNMIDAG</locationSetId>
						<timeSeriesType>external historical</timeSeriesType>
						<timeStep unit="day" multiplier="1" />
						<relativeViewPeriod unit="day" start="-2924" end="0"/>
						<readWriteMode>editing visible to all future task runs</readWriteMode>
					</timeSeriesSet>
				</inputVariable>
				<selectNumberOfLowestMin>3</selectNumberOfLowestMin>
				<outputVariable>
					<timeSeriesSet>
						<moduleInstanceId>SelectionPeriodMinimumFunctionTest</moduleInstanceId>
						<valueType>scalar</valueType>
						<parameterId>RH_24H.max</parameterId>
						<locationSetId>KNMIDAG</locationSetId>
						<timeSeriesType>external historical</timeSeriesType>
						<timeStep unit="nonequidistant"/>
						<relativeViewPeriod unit="day" start="-2924" end="0"/>
						<readWriteMode>editing visible to all future task runs</readWriteMode>
					</timeSeriesSet>
				</outputVariable>
			</minimum>
		</selection>
	</periodTransformation>
</transformation>

In this example:

For each hydrologic year, the three lowest minimum values are returned by the output time series.