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IFCMEASURERESOURCE

The data model consists of the following:

10  Entities
97  Defined types
5  Select types
5  Enumerations
4  Functions

The IfcMeasureResource schema specifies units and defined measure types that may be assigned to quantities. The fundamental unit types used in this schema are based on the SI system defined in ISO 1000+A1, 1992, 1998. Units in measurement systems other than SI may be derived using this schema.

The IfcMeasureResource schema is adapted from the ISO/CD 10303-41:1992, Industrial Automation Systems and Integration: Product Data Representation and Exchange Part 41: Integrated generic resources: Fundamentals of product description and support, and its Measure schema. For more information on the definitions as defined in the formal ISO standard please refer to: ISO/IS 10303-41:1994. The formal standard can be obtained through the local publishers of standards in each individual country.

The measure types and units have been heavily expanded from those of ISO/CD 10303-41, in order to meet particular buildingSMART domain requirements. Also, adaptions have been made according to the modelling rules of IFC development, especially not allowing ANDOR subtype constraint. A summary of SI base and derived units, related enumeration types and values, and defined measure types can be found below:
Units and Measures Summary in PDF-format

Some examples of instantiation of the units and measures can be found from:
Units and Measures Examples in PDF-format

NOTE: In the definitions of the unit exponents the use of superscript font has been omitted. Therefore, m2 means square metre, m3 means cubic meter, etc.

Entities (10):

Go to Diagram 1 IfcContextDependentUnit
Go to Diagram 1 IfcConversionBasedUnit
Go to Diagram 1 IfcDerivedUnit
Go to Diagram 1 IfcDerivedUnitElement
Go to Diagram 1 IfcDimensionalExponents
Go to Diagram 1 IfcMeasureWithUnit
Go to Diagram 1 IfcMonetaryUnit
Go to Diagram 1 IfcNamedUnit
Go to Diagram 1 IfcSIUnit
Go to Diagram 1 IfcUnitAssignment

Defined types (97):

Go to Diagram 3 IfcAbsorbedDoseMeasure
Go to Diagram 3 IfcAccelerationMeasure
Go to Diagram 2 IfcAmountOfSubstanceMeasure
Go to Diagram 3 IfcAngularVelocityMeasure
Go to Diagram 2 IfcAreaMeasure
Go to Diagram 2 IfcBoolean
Go to Diagram 2 IfcComplexNumber
Go to Diagram 3 IfcCompoundPlaneAngleMeasure
Go to Diagram 2 IfcContextDependentMeasure
Go to Diagram 2 IfcCountMeasure
Go to Diagram 4 IfcCurvatureMeasure
Go to Diagram 2 IfcDescriptiveMeasure
Go to Diagram 3 IfcDoseEquivalentMeasure
Go to Diagram 3 IfcDynamicViscosityMeasure
Go to Diagram 3 IfcElectricCapacitanceMeasure
Go to Diagram 3 IfcElectricChargeMeasure
Go to Diagram 3 IfcElectricConductanceMeasure
Go to Diagram 2 IfcElectricCurrentMeasure
Go to Diagram 3 IfcElectricResistanceMeasure
Go to Diagram 3 IfcElectricVoltageMeasure
Go to Diagram 3 IfcEnergyMeasure
Go to Diagram 3 IfcForceMeasure
Go to Diagram 3 IfcFrequencyMeasure
Go to Diagram 3 IfcHeatFluxDensityMeasure
Go to Diagram 4 IfcHeatingValueMeasure
Go to Diagram 2 IfcIdentifier
Go to Diagram 3 IfcIlluminanceMeasure
Go to Diagram 3 IfcInductanceMeasure
Go to Diagram 2 IfcInteger
Go to Diagram 3 IfcIntegerCountRateMeasure
Go to Diagram 4 IfcIonConcentrationMeasure
Go to Diagram 3 IfcIsothermalMoistureCapacityMeasure
Go to Diagram 3 IfcKinematicViscosityMeasure
Go to Diagram 2 IfcLabel
Go to Diagram 2 IfcLengthMeasure
Go to Diagram 3 IfcLinearForceMeasure
Go to Diagram 3 IfcLinearMomentMeasure
Go to Diagram 3 IfcLinearStiffnessMeasure
Go to Diagram 3 IfcLinearVelocityMeasure
Go to Diagram 2 IfcLogical
Go to Diagram 3 IfcLuminousFluxMeasure
Go to Diagram 4 IfcLuminousIntensityDistributionMeasure
Go to Diagram 2 IfcLuminousIntensityMeasure
Go to Diagram 3 IfcMagneticFluxDensityMeasure
Go to Diagram 3 IfcMagneticFluxMeasure
Go to Diagram 3 IfcMassDensityMeasure
Go to Diagram 3 IfcMassFlowRateMeasure
Go to Diagram 2 IfcMassMeasure
Go to Diagram 4 IfcMassPerLengthMeasure
Go to Diagram 3 IfcModulusOfElasticityMeasure
Go to Diagram 4 IfcModulusOfLinearSubgradeReactionMeasure
Go to Diagram 4 IfcModulusOfRotationalSubgradeReactionMeasure
Go to Diagram 3 IfcModulusOfSubgradeReactionMeasure
Go to Diagram 3 IfcMoistureDiffusivityMeasure
Go to Diagram 3 IfcMolecularWeightMeasure
Go to Diagram 3 IfcMomentOfInertiaMeasure
Go to Diagram 3 IfcMonetaryMeasure
Go to Diagram 2 IfcNormalisedRatioMeasure
Go to Diagram 2 IfcNumericMeasure
Go to Diagram 4 IfcPHMeasure
Go to Diagram 2 IfcParameterValue
Go to Diagram 3 IfcPlanarForceMeasure
Go to Diagram 2 IfcPlaneAngleMeasure
Go to Diagram 2 IfcPositiveLengthMeasure
Go to Diagram 2 IfcPositivePlaneAngleMeasure
Go to Diagram 2 IfcPositiveRatioMeasure
Go to Diagram 3 IfcPowerMeasure
Go to Diagram 3 IfcPressureMeasure
Go to Diagram 3 IfcRadioActivityMeasure
Go to Diagram 2 IfcRatioMeasure
Go to Diagram 2 IfcReal
Go to Diagram 3 IfcRotationalFrequencyMeasure
Go to Diagram 4 IfcRotationalMassMeasure
Go to Diagram 3 IfcRotationalStiffnessMeasure
Go to Diagram 4 IfcSectionModulusMeasure
Go to Diagram 4 IfcSectionalAreaIntegralMeasure
Go to Diagram 3 IfcShearModulusMeasure
Go to Diagram 2 IfcSolidAngleMeasure
Go to Diagram 4 IfcSoundPowerMeasure
Go to Diagram 4 IfcSoundPressureMeasure
Go to Diagram 3 IfcSpecificHeatCapacityMeasure
Go to Diagram 4 IfcTemperatureGradientMeasure
Go to Diagram 2 IfcText
Go to Diagram 3 IfcThermalAdmittanceMeasure
Go to Diagram 3 IfcThermalConductivityMeasure
Go to Diagram 4 IfcThermalExpansionCoefficientMeasure
Go to Diagram 3 IfcThermalResistanceMeasure
Go to Diagram 3 IfcThermalTransmittanceMeasure
Go to Diagram 2 IfcThermodynamicTemperatureMeasure
Go to Diagram 2 IfcTimeMeasure
Go to Diagram 3 IfcTimeStamp
Go to Diagram 3 IfcTorqueMeasure
Go to Diagram 3 IfcVaporPermeabilityMeasure
Go to Diagram 2 IfcVolumeMeasure
Go to Diagram 3 IfcVolumetricFlowRateMeasure
Go to Diagram 4 IfcWarpingConstantMeasure
Go to Diagram 4 IfcWarpingMomentMeasure

Select types (5):

Go to Diagram 3 IfcDerivedMeasureValue
Go to Diagram 2 IfcMeasureValue
Go to Diagram 2 IfcSimpleValue
Go to Diagram 1 IfcUnit
Go to Diagram 2 IfcValue

Enumerations (5):

Go to Diagram 1 IfcCurrencyEnum
Go to Diagram 1 IfcDerivedUnitEnum
Go to Diagram 1 IfcSIPrefix
Go to Diagram 1 IfcSIUnitName
Go to Diagram 1 IfcUnitEnum

Functions (4):

IfcCorrectDimensions
IfcCorrectUnitAssignment
IfcDeriveDimensionalExponents
IfcDimensionsForSiUnit