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Transformation - Sample nonEquidistant

Description and usage

This transformation is used to convert a non equidistant time series to an equidistant time series. The value at this time step will derived from sampling the equidistant time series. It is possible to configure how the equidistant time series should be sampled.

The available options are:

  • accumulate
  • block
  • linear
  • linearOrClosest
  • missing
  • nextTimeStep
  • previousTimeStep
  • zero

Closest

For each time step in the output time series the closest value in the sampled equidistant input time series is used as the output value.

ClosestForward

For each time step in the output time series the closest value after the output time step in the sampled equidistant input time series is used as the output value.

ClosestBackward

For each time step in the output time series the closest value before the output time step in the sampled equidistant input time series is used as the output value.

Linear

For each time step in the output time series the output value will be determined by linear interpolation between the closest value before the output time step and the closest value

after the output time step

Missing

All output values are set to missing.

Configuration

A basic configuration of the function is described below.

<?xml version="1.0" encoding="UTF-8"?>
<transformationModule version="1.0" xmlns="http://www.wldelft.nl/fews" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.wldelft.nl/fews http://fews.wldelft.nl/schemas/version1.0/transformationModule.xsd">
	<!--Input time series-->
	<variable>
		<variableId>Q_in</variableId>
		<timeSeriesSet>
			<moduleInstanceId>ImportDatabase</moduleInstanceId>
			<valueType>scalar</valueType>
			<parameterId>Q.obs</parameterId>
			<locationSetId>HydroGauges_HuangChuan</locationSetId>
			<timeSeriesType>external historical</timeSeriesType>
			<timeStep unit="nonequidistant"/>
			<relativeViewPeriod unit="day" start="-16" end="0" startOverrulable="true"/>
			<readWriteMode>add originals</readWriteMode>
		</timeSeriesSet>
	</variable>
	<!--Output time series-->
	<variable>
		<variableId>Q_out</variableId>
		<timeSeriesSet>
			<moduleInstanceId>HuangChuan_Update_Pre</moduleInstanceId>
			<valueType>scalar</valueType>
			<parameterId>Q.obs</parameterId>
			<locationSetId>HydroGauges_HuangChuan</locationSetId>
			<timeSeriesType>external historical</timeSeriesType>
			<timeStep unit="hour" multiplier="6"/>
			<relativeViewPeriod unit="day" start="-16" end="0" startOverrulable="true"/>
			<readWriteMode>add originals</readWriteMode>
		</timeSeriesSet>
	</variable>
	<!--Transformations-->
	<transformation id="nonequidistant to equidistant">
		<sample>
			<nonEquidistant>
				<nonEquidistantInputVariable>
					<variableId>Q_in</variableId>
				</nonEquidistantInputVariable>
				<interpolationType>linear</interpolationType>
				<outputVariable>
					<variableId>Q_out</variableId>
				</outputVariable>
			</nonEquidistant>
		</sample>
	</transformation>
</transformationModule>

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