BIM to GIS challenges and opportunites, formats and function, plus demos: IFC/Revit to CityGML and KML

1. BIM to GIS
3D Guru
Safe Staff

2. Agenda
 BIM to GIS Overview
 challenges and opportunities
 FME and BIM
 formats and function
 BIM to GIS
 Demos: IFC/Revit to CityGML & KML
 Other examples and use cases

3. BIM to GIS Overview
 BIM: powerful tool to manage information
throughout the building life cycle
 Challenge: rich BIM models gather dust while
facility managers re-digitize building plans
 Opportunity: FME’s BIM consumption and
conversion tools leverage valuable BIM data
 Potential: planning, maintenance, energy,
sustainability, security, emergency response

4. Why extract from BIM?
 Visualization – planning, site suitability
 2D floor plans - routing, maintenance
 Analysis - space management: scheduling /
leasing, energy / HVAC
 Construction management – as built vs design
 Facilities management – maintain and replace
components, work plans, reporting
 Updates – keep BIM current, add reference links

5. Conversion Challenges
• BIM too complex for most GIS applications
• Data model differences and gaps
• object vs relational
• Limited geo-referencing
• File size / instanced geometries
• Schema mapping
• which source feature types match GIS ones
• External references

6. Why FME and BIM?
BIM software exports
• overly complex (IFC)
• overly simplified (DWG, Excel)
FME
• keep the info you need
• discard the info you don’t
• preserve the meaning or intent
• place it in the right location

7. FME & 3D: Key Concepts
● 3D Geometry Types
o Surface, Mesh, Solid
● Geometry structure
o Aggregation, Traits, GQuery
● Appearances
● Instances

8. 3D Geometry types
Surface SolidMesh

9. • Adobe 3D PDF
• Autodesk 3DS
• AutoCAD Civil 3D
• AutoCAD DWG/DXF/RealDWG
• Bentley Microstation
• CityGML
• COLLADA / KML
• DirectX
• Esri Geodatabase
• Free File Geodatabase API
• Esri Shape
• Google SketchUp
• IFC
• LandXML
• LAS / LAZ
• Oracle Spatial Object
• Oracle Spatial Point Cloud
• Point Cloud XYZ
• Revit
• three.js
• VRML
• Wavefront OBJ
• XML / GML
• X3D
3D Formats
CAD VECTOR RASTER DATABASE BIM/3D WEB POINT CLOUD

10. BIM Formats
Reading:
 Revit
 IFC
 CityGML (BIM-lite)
Writing:
 IFC
 CityGML (ADE’s)

11. Reading Revit
Plugin Data Views

12. Reading IFC
● Data Model
o Hierarchical
o Relative
● Representations
o Body
o Annotations
● Property Sets
o Geometries
o Features

13. BIM to GIS: Transformation
 Schema mapping
 Resolving relationships
 Geometry
 Conversion / Extrusion
 Instances
 Appearances
 Validation
 Georeferencing

14. IFC to CityGML - Comparison
● Both Hierarchical
● Less levels in CityGML
● Different component types
● Solid vs. Surface

15. Source IFC in Solibri:
Riverside Building, DC

16. IFC100 to CityGML LOD2 Workspace
1. Read source IFC model
2. Create a single mesh
3. Set Building attributes and traits
4. Georeference
5. Write CityGML

17. CityGML LOD2 Result

18. Revit / IFC to CityGML LOD3 Workflow
 Read IFC / Revit reader (hierarchical view)
 Schema map IFC to CityGML feature types and fields
 Geometry conversion solid to surface (CSG to B-rep)
 Relationship preservation (parent / child)
 CityGML object construction, LODs, format attributes
 Building parts, roofs, walls, floors
 Openings (window and door hierarchy)
 Write CityGML

19. IFC200 to CityGML LOD3 Workspace

20. GIS Result: CityGML LOD3 Model

21. CityGML LOD3 to COLLADA/KML
 Read source CityGML
 Create a single mesh
 Set Attributes and traits for CityGML features
 Reproject from EPSG:2248 to LL84
 Write to KML (COLLADA is auto-generated and
linked)

22. CityGML to KML Workspace

23. KML / COLLADA: Georeferenced Result

24. Other Examples
 Leesburg Court house
 I-35 Bridge
 University of Washington
 HOK
 Data distribution
 Geometry Validation
 Updating and writing IFC

25. Revit to CityGML:
Leesburg Courthouse Square

26. I-35 Bridge in Revit

27. I35 Bridge CityGML

28. GeometryValidator for 3D
• Checks for solids with inverted faces,
dangling surfaces, unsealed solids, etc
• Flag errors with descriptions and locations
• Chain multiple validators to isolate
problems of interest (e.g 2d before 3d)
• Repair option

29. Writing IFC
● Updating IFC files with new information
o Merging from GIS or databases

30. Writing New IFC
● Property and Quantity Set
Definitions
● Used to define output sets
● From source IFC or create
using transformers
● Create Spaces from Floorplans

31. Distribution: 3DPDF, KML, GeoDB, OBJ

32. Summary
FME support for BIM and 3D workflows:
• Extract and filter from BIM – just what you need
• Translate to / from any GIS format
• Transform schema and geometry
• Validate schema, geometry and semantics
• Automate with enterprise services
• Publish BIM data to client friendly formats

33. Resources
● buildingSMART - IFC specifications and resources
o http://www.buildingsmart-tech.org/
● Cobie samples and info:
o http://www.nibs.org/?page=bsa_commonbimfiles
● IFC Viewers
o DDS-CAD: http://www.dds-cad.net/
o Solibri: http://www.solibri.com/products/solibri-
model-viewer/

34. Thank You!
 Questions?
 For more information:
 Enter name and email address
 Enter company name
 Enter other resources

35. Optional Extra Section: 3D Concepts

36. 3D Geometry types
Surface SolidMesh

37. Surface
Face
● Basic 3D Unit
● Bounded by Polygon
CompositeSurface
● Collection of connected Faces
● Consistent front/back directions on Faces
MultiSurface
● Collection of Faces and/or
CompositeSurfaces

38. Mesh
High efficiency surface storage

39. Solid
Box
● 3D solid primitive
● Not really useful
Extrusion
● Base Face and extrusion
direction/distance
BRepSolid
● Solid defined by closed
CompositeSurface
boundary

40. FME Geometry
Model

41. Geometry Structure
Multi Level
● Hierarchy Structure reflected in geometry
● Each level can be named
Traits and Attributes
● Attributes only on feature
● Traits are attributes on geometry
Geometry Query
● Operate on desired geometry level without
deconstructing aggregate

42. Appearances
Colors
● Diffuse, Ambient, Emissive, Alpha
Textures
● Image applied to Faces

43. Textures
UV mapping
CC BY-SA 3.0 - Tschmits

44. Shared Items
ID = 245
ID = 456
Appearance
s
Model
s

45. Transformers
Create
● Creator, FaceReplacer, Extruder, SurfaceModeller, CSGBuilder
Modify
● Clipper, Triangulator, GeometryCoercer, GeometryValidator, MeshMerger
Appearances
● AppearanceSetter, AppearanceExtractor, GeometryColorSetter
Instances
● Instantiator

46. Transformers
Shared Items
● SharedItemAdder, SharedItemRetreiver, SharedItemIDSetter,
SharedItemIDExtractor
Structure/Traits
● GeometryPartExtractor, GeometryPropertySetter, GeometryPropertyExtractor,
GeometryPropertyRenamer, GeometryPropertyRemover, TraitMerger

47. Resources
Documentation - 3D Support
http://docs.safe.com/fme/html/FME_Transformers/FME_Transformers.htm#geometry/FME_3D_Suppo
rt.htm
FMEpedia 3D Landing Page
http://fmepedia.safe.com/topic/3D
http://fmepedia.safe.com/articles/How_To/3D-Tutorial
Demo Models
Medallion: https://3dwarehouse.sketchup.com/model.html?id=328b2563208452451432fd505d2dea30
Pole 1: https://3dwarehouse.sketchup.com/model.html?id=u6996889e-eb44-416e-be2d-dff5300d8265
Pole 2: https://3dwarehouse.sketchup.com/model.html?id=e9a21787b95645893b15bbb3b8c2c5e
House: https://3dwarehouse.sketchup.com/model.html?id=a05876468fc8fc65e72cf94dbba6e90c