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Set of rules to allow selection of lows from an input time series.
Attributes
Input
Timeseries
Options
In the configuration of low selections there are two choices for refining the selection:Requirements for definitions of peak selections using gaps to define independence are;
- An attribute "lowsBeforeT0totalNumberBeforeT0" must be defined. The value attribute defines the maximum number of lows to consider before T0.
- An attribute "lowsAfterT0totalNumberAfterT0" must be defined. The value attribute defines the maximum number of lows to consider before after T0.
- An attribute "totalNumberOfLows" must be defined. The value must be set to zero.
The following two attributes are optional:
- An attribute "skipJustBeforeT0" indicates how many lows to skip just before T0. (optional)
- An attribute "skipJustAfterT0" indicates how many lows to skip just after T0.
They default to 0.
- (optional)
or
- An attribute "totalNumber" must be defined. The value attribute defines the maximum number of lows to consider.
Output
Timeseries containing the selection of lows
Configuration example
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<transformation id="lows function test"> <selection> <lows> <inputVariable> <timeSeriesSet> <moduleInstanceId>SelectionLowsFunctionTest</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> <gapLengthInSec>2700<<totalNumberBeforeT0>3</gapLengthInSec>totalNumberBeforeT0> <lowsBeforeT0>0<<totalNumberAfterT0>4</lowsBeforeT0>totalNumberAfterT0> <lowsAfterT0>15</lowsAfterT0> <totalNumberOfLows>0</totalNumberOfLows> <skipJustBeforeT0>0<<skipJustBeforeT0>2</skipJustBeforeT0> <skipJustAfterT0>5<<skipJustAfterT0>2</skipJustAfterT0> <outputVariable> <timeSeriesSet> <moduleInstanceId>SelectionLowsFunctionTest</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> </lows> </selection> </transformation> |
In this example:
- The time between two local minima (lows) should be at least 2700 seconds or 45 minutes.
- Only the last three lows before T0 and the first four lows after T0 are considered.
- The first two lows of the last two three lows just before T0 are skipped, leaving only the third last one.
- Similarly the first two lows just after T0 are skipped, leaving the third and fourth ones.