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Specialization of BasicData for Travel Time: TravelTimeData

Travel time data is encoded using the TravelTimeData specialization.

The complete structure is shown below. In the Dutch Profile, only travelTime and normallyExpectedTravelTime are applied.

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Elements

Element Type Mandatory Domain Description
travelTimeType TravelTimeTypeEnum Yes best, estimated, instantaneous, reconstituted Indicates the method used to determine the travel time
travelTime DurationValue Yes N/A The travelTime element is a specialization of DurationValue, which is itself a specialization of DataValue
normallyExpectedTravelTime DurationValue Yes N/A The normallyExpectedTravelTime element contains the reference value for the travel time. It is a specialization of DurationValue, which is itself a specialization of DataValue

Subelements travelTime and normallyExpectedTravelTime

The elements travelTime and normallyExpectedTravelTime share the same structure and content. They describe the actual travel time and the reference value for the travel time, respectively.

Attribute Type Mandatory Domain Description
accuracy Percentage No >= 0, <= 100 Not used in the Dutch Profile
computationalMethod ComputationMethodEnum Only if different from the specification in the measurementSite See explanation
numberOfIncompleteInputs NonNegativeInteger Only if available and relevant for the used computational method >= 0 The number of incomplete observations over a period
numberOfInputValuesUsed NonNegativeInteger Only if available and relevant for the used computational method >= 0 The number of observations used in a measurement period to determine a value
smoothingFactor Float No >= 0 Not used in the Dutch Profile
standardDeviation Float No >= 0 The spread of individual observations over the measurement period
supplierCalculatedDataQuality Percentage Only if different from the specification in the measurementSite >= 0, <= 100 A quality indicator assigned by the data provider
Element Type Mandatory Domain Description
dataError Boolean No true, false Indicates if an error has been detected with this measurement point, see explanation
reasonForDataError MultilingualString No Max. 10 characters Error code for the data error
duration Seconds Yes >= 0, -1 The travel time in seconds between two specified locations in the indicated direction

Sub-attribute computationMethod

The computationMethod element describes the calculation method used to determine the values reported for this measurement site. The following possible values are available:

  • arithmeticAverageOfSamplesBasedOnAFixedNumberOfSamples: Arithmetic average over a fixed number of values, i.e., A = (v1 + v2 + … + vn) / n, with n fixed;
  • arithmeticAverageOfSamplesInATimePeriod: Arithmetic average over values in a fixed time period, i.e., A = (v1 + v2 + … + vn) / n, with n variable;
  • harmonicAverageOfSamplesInATimePeriod: Harmonic average over values in a fixed time period, i.e., H = n / (1/v1 + 1/v2 + … + 1/vn), with n variable;
  • medianOfSamplesInATimePeriod: Median of the values in a fixed period, meaning half of the values in that period are less than or equal to the median M;
  • movingAverageOfSamples: Moving average over values, i.e., At=1 = ((n-1) * (At=0/n) + vn)/n, with n fixed.

Subelement dataError

If a measurement point or measurement section does not provide data, or if the data provider determines that the data is unreliable, the following attributes must be filled for each data type:

  • The duration element will have the value “-1”.
  • The dataError element will be set to “true”
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