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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

options
  • maxGapLength
  • ignoreMissing / validationRule

maxGaplength: Gaps equal to or smaller than maxGapLength will be filled with sampled values. Gaps larger than maxGapLength will not be filled. If maxGapLength is not defined, then all gaps will be filled with sampled values. Only implemented for linear interpolation. ignoreMissing: if true, then missing values are ignored. If false, then an output value will be missing if one or more of the corresponding input values are missing or unreliable. Default is true.

Configuration

A basic configuration of the function is described below.

Code Block
<?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>