Developing a CityGML/IFC interface to integrate BIM models with Geo models

slides from the GeoBIM project launch event (https://3d.bk.tudelft.nl/projects/geobim/)

Transcript

1. Developing a CityGML/IFC interface to integrate BIM models with Geo models Ken Arroyo Ohori, Thomas Krijnen & Hugo Ledoux Launch Geo-BIM project 2017-02-15
2. CityGML 2 • int’l standard for representing and storing 3D city models • mostly scale of the city/neighbourhood • boundary representation used (b-rep)
3. CityGML: 5 Levels-of-detail 3 there usually reconstructed ‘as-built’, because “easy” with point clouds rather rare in practice, because costly and complex to acquire data
4. IFC (Industry Foundation Classes) 4 • open data model for buildings and construction industry data • one implementation of BIM (Building Information Modelling)
5. IFC (Industry Foundation Classes) 5 IfcActuatorType IfcAirTerminalBoxType IfcAirTerminalType IfcAirToAirHeatRecoveryType IfcAlarmType IfcAnnotation IfcBeam IfcBoilerType IfcBuildingElementPart IfcBuildingElementProxy IfcBuildingStorey IfcCableCarrierFittingType IfcCableCarrierSegmentType IfcCableSegmentType IfcChillerType IfcCoilType IfcColumnType IfcCompressorType IfcCondenserType IfcControllerType IfcCooledBeamType IfcCoolingTowerType IfcCovering IfcCurtainWall IfcDamperType IfcDistributionChamberElementType IfcDistributionControlElement IfcDistributionElement IfcDistributionFlowElement IfcDoorType IfcDuctFittingType IfcDuctSegmentType IfcDuctSilencerType IfcElectricApplianceType IfcElectricFlowStorageDeviceType IfcElectricGeneratorType IfcElectricHeaterType IfcElectricMotorType IfcElectricTimeControlType IfcElementAssembly IfcRoof IfcSanitaryTerminalType IfcSensorType IfcSite IfcSlab IfcSpace IfcSpaceHeaterType IfcStackTerminalType IfcStair IfcSwitchingDeviceType IfcSystemFurnitureElementType IfcTankType IfcTransformerType IfcTransportElementType IfcTubeBundleType IfcUnitaryEquipmentType IfcValveType IfcWall IfcWasteTerminalType IfcWindowType IfcEnergyConversionDevice IfcEvaporativeCoolerType IfcEvaporatorType IfcFanType IfcFastenerType IfcFilterType IfcFireSuppressionTerminalType IfcFlowController IfcFlowFitting IfcFlowInstrumentType IfcFlowMeterType IfcFlowMovingDevice IfcFlowSegment IfcFlowStorageDevice IfcFlowTerminal IfcFlowTreatmentDevice IfcFooting IfcFurnishingElement IfcFurnitureType IfcGasTerminalType IfcHeatExchangerType IfcHumidifierType IfcJunctionBoxType IfcLampType IfcLightFixtureType IfcMechanicalFastenerType IfcMemberType IfcMotorConnectionType IfcOpeningElement IfcOutletType IfcPile IfcPipeFittingType IfcPipeSegmentType IfcPlateType IfcProtectiveDeviceType IfcPumpType IfcRailing IfcRamp IfcReinforcingBar IfcReinforcingMesh 900+ in total
6. IFC (Industry Foundation Classes) 6 Figure adapted from Kolbe and Plümer (2004) explicit representation implicit representation (need to be discretised to be manipulated with GIS objects)
7. IFC vs CityGML 7 IFC CityGML Large scale (mm) Small scale (km) World Country City Region Building Component Room Sec�on Floor Building
8. IFC vs CityGML 8
9. IFC vs CityGML 9 Figure Nagel et. al (2009)
10. IFC vs CityGML 10
11. Bridging the gaps between IFC and CityGML 11 1. gap in semantic 2. gap in geometry/topology 3. gap in coordinate reference systems
12. Results with current commercial software 12 most geometries are converted IFC CityGML
13. Our goal 13 Develop an interface between CityGML and IFC to prepare for a fundamental solution to bridge the gap between Geo and BIM. 1. open-source API to represent IFC + CityGML with the same data structure 2. recommendations for future integration +
14. Use-case #1 14 Supporting the lifecycle of objects with a continuous information chain, ie using geoinformation in BIM application and IFC datasets in GIS applications. <—>
15. Use-case #2 15 Submission of IFC model to a building permit-application portal: automatic validation of the design against physical world (eg noise, shadows, zoning plans)
16. Use-case #2 16 Submission of IFC model to a building permit-application portal: automatic validation of the design against physical world (eg noise, shadows, zoning plans) == georeferencing
17. code already open-source (but very much alpha…) 17
18. CUVO Ockenburghstraat KOW 18
19. CUVO Ockenburghstraat KOW 19
20. Rabarberstraat144 20
21. Rabarberstraat144 21
22. Georeferencing = a practical problem, we should agree on what objects to store in the IFC files 22
23. #8086= IFCSITE('3ON6rlyNf2J8SSxEd39t9w',#42,'Surface: 42854',$,'',#8085,#8082,$,.ELEMENT., (52,4,13,797912),(4,18,2,518959),0.,$,$);
24. TU/e results
25. BIM to OGC GeoSPARQL (Pauwels, Terkaj, Krijnen, Beetz, 2017)
26. BIM to infra (Wijnholts, Krijnen, Beetz, 2017)
27. TU Delft results
28. Automatic conversion IFC to CityGML LoD3
29. Our conversion methodology 29 a CityGML LoD3 shouldn’t have “thick” walls
30. step 1: semantic conversion 30 <<Object>> IfcProject <<Object>> IfcSite <<Object>> IfcBuilding <<Object>> IfcBuildingStorey <<Object>> IfcSpace <<Object>> IfcSpatialStructureElement <<Object>> IfcProduct IfcObject <<Object>> IfcElement <<Object>> IfcOpeningElement <<Object>> IfcBuildingElement 1 1 0..* 0..* 1 1..* 1 IfcWall IfcBeam IfcRelDecomposes IfcCurtainWall IfcDoor IfcColumn IfcCovering IfcWindow IfcFooting IfcPile IfcPlate IfcRailing IfcRamp IfcRampFlight IfcStair IfcStairFlight IfcRoof IfcSlab IfcBuildingElementProxy IfcMember <<Geometry>> IfcShapeRepresentation <<Geometry>> IfcLocalPlacement 0..* 1 0..1 1 IfcBuildingElement Component IfcRelContainedInSpatialStructure 0..* 1 0..1 1 1 0..* 1 1 0..* 0..* 1 0..*
31. step 2: geometric transformation 31 input IFC union of all solids removal interior notice that each surface already has a semantics (diff colours)
32. Implementation 32 Boolean operations and morphological operators (packages 3D Polyhedral Surface + Nef Polyhedra) Reading IFC + CSG operations Our data structure couldn’t store attributes, thus the semantics is attached after all the operations to the closest face.
33. Experimental results (FZK-House) 33 IFC CityGML
34. Experimental results (Haus-G-H) 34 IFC CityGML
35. Experimental results (Haus-G-H) 35 IFC CityGML
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37. Experimental results (Office-Building) 37 IFC CityGML
38. Experimental results (Office-Building) 38 IFC CityGML
39. thank you. Hugo Ledoux 3d.bk.tudelft.nl/hledoux h.ledoux@tudelft.nl