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Unit documentation improvements (#109)
Added column for expected project unit. Removed duplicate IfcPlaneAngleMeasure row.
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‎Documentation/units.md

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@@ -2,59 +2,58 @@ Numerical values of physical quantities are represented using SI units. The foll
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A full list of IFC Defined types can be found in the IFC documentation. For example for IFC 4ADD2TC1 it is here: https://standards.buildingsmart.org/IFC/RELEASE/IFC4/ADD2_TC1/HTML/link/alphabeticalorder-defined-types.htm
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| Ifc Defined Type name | Physical Quantity description | Unit | Unit Symbol | Dimensional exponents |
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| ------------------------------------ | ----------------------------- | ------------ | ----------- | ----------------------- |
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| IfcAmountOfSubstanceMeasure | Amount of substance | mole | mol | (0, 0, 0, 0, 0, 1, 0) |
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| IfcAreaDensityMeasure | Area density | | Kg/m2 | (-2, 1, 0, 0, 0, 0, 0) |
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| IfcAreaMeasure | Area | square meter | m2 | (2, 0, 0, 0, 0, 0, 0) |
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| IfcDynamicViscosityMeasure | Dynamic viscosity | | Pa s | (-1, 1, -1, 0, 0, 0, 0) |
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| IfcElectricCapacitanceMeasure | Electric capacitance | farad | F | (-2, 1, 4, 1, 0, 0, 0) |
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| IfcElectricChargeMeasure | Electric charge | coulomb | C | (0, 0, 1, 1, 0, 0, 0) |
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| IfcElectricConductanceMeasure | Electric conductance | siemens | S | (-2, -1, 3, 2, 0, 0, 0) |
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| IfcElectricCurrentMeasure | Electric current | ampere | A | (0, 0, 0, 1, 0, 0, 0) |
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| IfcElectricResistanceMeasure | Electric resistance | ohm | Ω | (2, 1, -3, -2, 0, 0, 0) |
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| IfcElectricVoltageMeasure | Electric voltage | volt | V | (2, 1, -3, -1, 0, 0, 0) |
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| IfcEnergyMeasure | Energy | joule | J | (2, 1, -2, 0, 0, 0, 0) |
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| IfcForceMeasure | Force | newton | N | (1, 1, -2, 0, 0, 0, 0) |
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| IfcFrequencyMeasure | Frequency | hertz | Hz | (0, 0, -1, 0, 0, 0, 0) |
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| IfcHeatFluxDensityMeasure | Heat flux density | | W/m2 | (0, 1, -3, 0, 0, 0, 0) |
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| IfcHeatingValueMeasure | Heating | | J/K | (2, 1, -2, 0, -1, 0, 0) |
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| IfcIlluminanceMeasure | Illuminance | lux | lx | (-2, 0, 0, 0, 0, 0, 1) |
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| IfcIonConcentrationMeasure | Ion concentration measure | | mol/m3 | (-3, 1, 0, 0, 0, 0, 0) |
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| IfcIsothermalMoistureCapacityMeasure | Iso thermal moisture capacity | | m3/Kg | (3, -1, 0, 0, 0, 0, 0) |
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| IfcLengthMeasure | Length | meter | m | (1, 0, 0, 0, 0, 0, 0) |
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| IfcLinearVelocityMeasure | Speed | | m/s | (1, 0, -1, 0, 0, 0, 0) |
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| IfcLuminousFluxMeasure | Luminous flux | Lumen | lm | (0, 0, 0, 0, 0, 0, 1) |
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| IfcLuminousIntensityMeasure | Luminous intensity | candela | cd | (0, 0, 0, 0, 0, 0, 1) |
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| IfcMassDensityMeasure | Mass density | | Kg/m3 | (-3, 1, 0, 0, 0, 0, 0) |
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| IfcMassFlowRateMeasure | Mass flow rate | | Kg/s | (0, 1, -1, 0, 0, 0, 0) |
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| IfcMassMeasure | Mass | kilogram | Kg | (0, 1, 0, 0, 0, 0, 0) |
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| IfcMassPerLengthMeasure | Mass per length | | Kg/m | (-1, 1, 0, 0, 0, 0, 0) |
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| IfcModulusOfElasticityMeasure | Modulus of elasticity | | N/m2 | (-1, 1, -2, 0, 0, 0, 0) |
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| IfcMoistureDiffusivityMeasure | Moisture diffusivity | | m3/s | (3, 0, -1, 0, 0, 0, 0) |
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| IfcMolecularWeightMeasure | Molecular weight | | Kg/mol | (0, 1, 0, 0, 0, -1, 0) |
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| IfcMomentOfInertiaMeasure | Moment of inertia | | m4 | (4, 0, 0, 0, 0, 0, 0) |
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| IfcPHMeasure | PH | | PH | (0, 0, 0, 0, 0, 0, 0) |
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| IfcPlanarForceMeasure | Planar force | | Pa | (-1, 1, -2, 0, 0, 0, 0) |
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| IfcPlaneAngleMeasure | Angle | radian | rad | (0, 0, 0, 0, 0, 0, 0) |
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| IfcPlaneAngleMeasure | Plane angle | radian | rad | (0, 0, 0, 0, 0, 0, 0) |
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| IfcPowerMeasure | Power | watt | W | (2, 1, -3, 0, 0, 0, 0 |
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| IfcPressureMeasure | Pressure | pascal | Pa | (-1, 1, -2, 0, 0, 0, 0) |
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| IfcRadioActivityMeasure | Radio activity | Becqurel | Bq | (0, 0, -1, 0, 0, 0, 0) |
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| IfcRatioMeasure | Ratio | Percent | % | (0, 0, 0, 0, 0, 0, 0) |
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| IfcRotationalFrequencyMeasure | Rotational frequency | hertz | Hz | (0, 0, -1, 0, 0, 0, 0) |
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| IfcSectionModulusMeasure | Section modulus | | m3 | (3, 0, 0, 0, 0, 0, 0) |
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| IfcSoundPowerMeasure | Sound power | decibel | db | (0, 0, 0, 0, 0, 0, 0) |
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| IfcSoundPressureMeasure | Sound pressure | decibel | db | (0, 0, 0, 0, 0, 0, 0) |
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| IfcSpecificHeatCapacityMeasure | Specific heat capacity | | J/Kg K | (2, 0, -2, 0, -1, 0, 0) |
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| IfcTemperatureRateOfChangeMeasure | Temperature rate of change | | K/s | (0, 0, -1, 0, 1, 0, 0) |
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| IfcThermalConductivityMeasure | Thermal conductivity | | W/m K | (1, 1, -3, 0, -1, 0, 0) |
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| IfcThermodynamicTemperatureMeasure | Temperature | kelvin | K | (0, 0, 0, 0, 1, 0, 0) |
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| IfcTimeMeasure | Time | second | s | (0, 0, 1, 0, 0, 0, 0) |
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| IfcTorqueMeasure | Torque | | N m | (2, 1, -2, 0, 0, 0, 0) |
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| IfcVaporPermeabilityMeasure | Vapor permeability | | Kg / s m Pa | (0, 0, 1, 0, 0, 0, 0) |
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| IfcVolumeMeasure | Volume | cubic meter | m3 | (3, 0, 0, 0, 0, 0, 0) |
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| IfcVolumetricFlowRateMeasure | Volumetric flow rate | | m3/s | (3, 0, -1, 0, 0, 0, 0) |
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| Ifc Defined Type name | Physical Quantity description | Unit | Unit Symbol | Dimensional exponents | Unit enumeration |
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| ------------------------------------ | ----------------------------- | ------------ | ----------- | ----------------------- | -------------------------------------------------- |
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| IfcAmountOfSubstanceMeasure | Amount of substance | mole | mol | (0, 0, 0, 0, 0, 1, 0) | IfcUnitEnum.AMOUNTOFSUBSTANCEUNIT |
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| IfcAreaDensityMeasure | Area density | | Kg/m2 | (-2, 1, 0, 0, 0, 0, 0) | IfcDerivedUnitEnum.AREADENSITYUNIT |
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| IfcAreaMeasure | Area | square meter | m2 | (2, 0, 0, 0, 0, 0, 0) | IfcUnitEnum.AREAUNIT |
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| IfcDynamicViscosityMeasure | Dynamic viscosity | | Pa s | (-1, 1, -1, 0, 0, 0, 0) | IfcDerivedUnitEnum.DYNAMICVISCOSITYUNIT |
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| IfcElectricCapacitanceMeasure | Electric capacitance | farad | F | (-2, 1, 4, 1, 0, 0, 0) | IfcUnitEnum.ELECTRICCAPACITANCEUNIT |
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| IfcElectricChargeMeasure | Electric charge | coulomb | C | (0, 0, 1, 1, 0, 0, 0) | IfcUnitEnum.ELECTRICCHARGEUNIT |
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| IfcElectricConductanceMeasure | Electric conductance | siemens | S | (-2, -1, 3, 2, 0, 0, 0) | IfcUnitEnum.ELECTRICCONDUCTANCEUNIT |
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| IfcElectricCurrentMeasure | Electric current | ampere | A | (0, 0, 0, 1, 0, 0, 0) | IfcUnitEnum.ELECTRICCURRENTUNIT |
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| IfcElectricResistanceMeasure | Electric resistance | ohm | Ω | (2, 1, -3, -2, 0, 0, 0) | IfcUnitEnum.ELECTRICRESISTANCEUNIT |
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| IfcElectricVoltageMeasure | Electric voltage | volt | V | (2, 1, -3, -1, 0, 0, 0) | IfcUnitEnum.ELECTRICVOLTAGEUNIT |
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| IfcEnergyMeasure | Energy | joule | J | (2, 1, -2, 0, 0, 0, 0) | IfcUnitEnum.ENERGYUNIT |
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| IfcForceMeasure | Force | newton | N | (1, 1, -2, 0, 0, 0, 0) | IfcUnitEnum.FORCEUNIT |
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| IfcFrequencyMeasure | Frequency | hertz | Hz | (0, 0, -1, 0, 0, 0, 0) | IfcUnitEnum.FREQUENCYUNIT |
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| IfcHeatFluxDensityMeasure | Heat flux density | | W/m2 | (0, 1, -3, 0, 0, 0, 0) | IfcDerivedUnitEnum.HEATFLUXDENSITYUNIT |
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| IfcHeatingValueMeasure | Heating | | J/K | (2, 1, -2, 0, -1, 0, 0) | IfcDerivedUnitEnum.HEATINGVALUEUNIT |
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| IfcIlluminanceMeasure | Illuminance | lux | lx | (-2, 0, 0, 0, 0, 0, 1) | IfcUnitEnum.ILLUMINANCEUNIT |
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| IfcIonConcentrationMeasure | Ion concentration measure | | mol/m3 | (-3, 1, 0, 0, 0, 0, 0) | IfcDerivedUnitEnum.IONCONCENTRATIONUNIT |
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| IfcIsothermalMoistureCapacityMeasure | Iso thermal moisture capacity | | m3/Kg | (3, -1, 0, 0, 0, 0, 0) | IfcDerivedUnitEnum.ISOTHERMALMOISTURECAPACITYUNIT |
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| IfcLengthMeasure | Length | meter | m | (1, 0, 0, 0, 0, 0, 0) | IfcUnitEnum.LENGTHUNIT |
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| IfcLinearVelocityMeasure | Speed | | m/s | (1, 0, -1, 0, 0, 0, 0) | IfcDerivedUnitEnum.LINEARVELOCITYUNIT |
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| IfcLuminousFluxMeasure | Luminous flux | Lumen | lm | (0, 0, 0, 0, 0, 0, 1) | IfcUnitEnum.LUMINOUSFLUXUNIT |
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| IfcLuminousIntensityMeasure | Luminous intensity | candela | cd | (0, 0, 0, 0, 0, 0, 1) | IfcUnitEnum.LUMINOUSINTENSITYUNIT |
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| IfcMassDensityMeasure | Mass density | | Kg/m3 | (-3, 1, 0, 0, 0, 0, 0) | IfcDerivedUnitEnum.MASSDENSITYUNIT |
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| IfcMassFlowRateMeasure | Mass flow rate | | Kg/s | (0, 1, -1, 0, 0, 0, 0) | IfcDerivedUnitEnum.MASSFLOWRATEUNIT |
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| IfcMassMeasure | Mass | kilogram | Kg | (0, 1, 0, 0, 0, 0, 0) | IfcUnitEnum.MASSUNIT |
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| IfcMassPerLengthMeasure | Mass per length | | Kg/m | (-1, 1, 0, 0, 0, 0, 0) | IfcDerivedUnitEnum.MASSPERLENGTHUNIT |
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| IfcModulusOfElasticityMeasure | Modulus of elasticity | | N/m2 | (-1, 1, -2, 0, 0, 0, 0) | IfcDerivedUnitEnum.MODULUSOFELASTICITYUNIT |
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| IfcMoistureDiffusivityMeasure | Moisture diffusivity | | m3/s | (3, 0, -1, 0, 0, 0, 0) | IfcDerivedUnitEnum.MOISTUREDIFFUSIVITYUNIT |
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| IfcMolecularWeightMeasure | Molecular weight | | Kg/mol | (0, 1, 0, 0, 0, -1, 0) | IfcDerivedUnitEnum.MOLECULARWEIGHTUNIT |
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| IfcMomentOfInertiaMeasure | Moment of inertia | | m4 | (4, 0, 0, 0, 0, 0, 0) | IfcDerivedUnitEnum.MOMENTOFINERTIAUNIT |
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| IfcPHMeasure | PH | | PH | (0, 0, 0, 0, 0, 0, 0) | IfcDerivedUnitEnum.PHUNIT |
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| IfcPlanarForceMeasure | Planar force | | Pa | (-1, 1, -2, 0, 0, 0, 0) | IfcDerivedUnitEnum.PLANARFORCEUNIT |
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| IfcPlaneAngleMeasure | Angle | radian | rad | (0, 0, 0, 0, 0, 0, 0) | IfcUnitEnum.PLANEANGLEUNIT |
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| IfcPowerMeasure | Power | watt | W | (2, 1, -3, 0, 0, 0, 0 | IfcUnitEnum.POWERUNIT |
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| IfcPressureMeasure | Pressure | pascal | Pa | (-1, 1, -2, 0, 0, 0, 0) | IfcUnitEnum.PRESSUREUNIT |
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| IfcRadioActivityMeasure | Radio activity | Becqurel | Bq | (0, 0, -1, 0, 0, 0, 0) | IfcUnitEnum.RADIOACTIVITYUNIT |
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| IfcRatioMeasure | Ratio | Percent | % | (0, 0, 0, 0, 0, 0, 0) | |
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| IfcRotationalFrequencyMeasure | Rotational frequency | hertz | Hz | (0, 0, -1, 0, 0, 0, 0) | IfcDerivedUnitEnum.ROTATIONALFREQUENCYUNIT |
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| IfcSectionModulusMeasure | Section modulus | | m3 | (3, 0, 0, 0, 0, 0, 0) | IfcDerivedUnitEnum.SECTIONMODULUSUNIT |
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| IfcSoundPowerMeasure | Sound power | decibel | db | (0, 0, 0, 0, 0, 0, 0) | IfcDerivedUnitEnum.SOUNDPOWERUNIT |
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| IfcSoundPressureMeasure | Sound pressure | decibel | db | (0, 0, 0, 0, 0, 0, 0) | IfcDerivedUnitEnum.SOUNDPRESSUREUNIT |
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| IfcSpecificHeatCapacityMeasure | Specific heat capacity | | J/Kg K | (2, 0, -2, 0, -1, 0, 0) | IfcDerivedUnitEnum.SPECIFICHEATCAPACITYUNIT |
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| IfcTemperatureRateOfChangeMeasure | Temperature rate of change | | K/s | (0, 0, -1, 0, 1, 0, 0) | IfcDerivedUnitEnum.TEMPERATURERATEOFCHANGEUNIT |
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| IfcThermalConductivityMeasure | Thermal conductivity | | W/m K | (1, 1, -3, 0, -1, 0, 0) | IfcDerivedUnitEnum.THERMALCONDUCTANCEUNIT |
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| IfcThermodynamicTemperatureMeasure | Temperature | kelvin | K | (0, 0, 0, 0, 1, 0, 0) | IfcUnitEnum.THERMODYNAMICTEMPERATUREUNIT |
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| IfcTimeMeasure | Time | second | s | (0, 0, 1, 0, 0, 0, 0) | IfcUnitEnum.TIMEUNIT |
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| IfcTorqueMeasure | Torque | | N m | (2, 1, -2, 0, 0, 0, 0) | IfcDerivedUnitEnum.TORQUEUNIT |
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| IfcVaporPermeabilityMeasure | Vapor permeability | | Kg / s m Pa | (0, 0, 1, 0, 0, 0, 0) | IfcDerivedUnitEnum.VAPORPERMEABILITYUNIT |
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| IfcVolumeMeasure | Volume | cubic meter | m3 | (3, 0, 0, 0, 0, 0, 0) | IfcUnitEnum.VOLUMEUNIT |
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| IfcVolumetricFlowRateMeasure | Volumetric flow rate | | m3/s | (3, 0, -1, 0, 0, 0, 0) | IfcDerivedUnitEnum.VOLUMETRICFLOWRATEUNIT |
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In software values are typically presented in local units. The following table lists some examples how things are represented to the user and how they are represented in IDS.
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