Description
Set of rules to allow selection of lows from an input time series.
Attributes
Requirements for definitions of peak selections using gaps to define independence are;
- An attribute "gapLengthInsec" must be defined. The value attribute defines the length of the minimum gap in seconds.
- An attribute "lowsBeforeT0" must be defined. The value attribute defines the maximum number of lows to consider before T0.
- An attribute "lowsAfterT0" must be defined. The value attribute defines the maximum number of lows to consider before 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.
- An attribute "skipJustAfterT0" indicates how many lows to skip just after T0.
They default to 0.
Configuration example
SelectionLowsFunctionTest 1.00 default.xml
<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</gapLengthInSec>
<lowsBeforeT0>0</lowsBeforeT0>
<lowsAfterT0>15</lowsAfterT0>
<totalNumberOfLows>0</totalNumberOfLows>
<skipJustBeforeT0>0</skipJustBeforeT0>
<skipJustAfterT0>5</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 last two lows just before T0 are skipped, leaving only the third last one.
- Similarly the first lows just after T0 are skipped, leaving the third and fourth ones.
