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As the name suggests this validation rule provides the facility to check the rate of continuous change (rise/fall) within a specified time period or span. The configuration part is almost similar to that of Rate of Change with one exception i.e. giving a timespan as shown below.

	<validationRuleSet validationRuleSetId="validationROCTimeSpantest1896" timeZone="GMT">
		<rateOfChangeTimeSpan>		
			<rateofRiseFallDifferent>
				<rateOfRise constantLimit="1.6667E-05"/>
				<rateOfFall constantLimit="-1.6667E-05"/>
			</rateofRiseFallDifferent>
			<timeSpan unit="minute" multiplier="60"/>
		</rateOfChangeTimeSpan>
		<timeSeriesSet>
			<moduleInstanceId>Validation-import</moduleInstanceId>
			<valueType>scalar</valueType>
			<parameterId>Q.m</parameterId>
			<locationSetId>Meteo Stations</locationSetId>
			<timeSeriesType>external historical</timeSeriesType>
			<timeStep unit="hour"/>
			<readWriteMode>add originals</readWriteMode>
		</timeSeriesSet>
	</validationRuleSet>

Example

For this example, we take the rate of change (rise or fall of 0.1/hr) and timespan of 4 hr.

Looking at the figure above, the rate if of change between Pnt0 and Pnt1 is more than Pnt1 and Pnt2. For a given validation rule, the rate of rise between Pnt0 and Pnt1 is violated and hence Pnt1 will be marked as Unreliaable point.

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Under normal circumtance Pnt1 will be marked as Unreliaable Unreliable point, and Pnt2 will be marked as Reliaable Reliable point. But looking as long as the time elapsed between Pnt0 and Pnt2 is not exceeded the given timespan, Pnt2 will be compared with the Pnt0 instead of Pnt1. In such a situation Pnt2 will also be marked as Unreliable point.

Now we move further to Pnt3, the rate of rise between Pnt2 and Pnt3 is not violated, however compared to the Pnt0, Pnt3 will be violating rate of change because it also falls under the timespan of 4 hrs.