The document provides an overview of the integration between Building Information Modeling (BIM) and Geographic Information Systems (GIS), highlighting the challenges and opportunities in leveraging BIM data for various applications such as facilities management and construction. It discusses tools like FME for the conversion and management of complex BIM data formats like IFC and Revit into GIS-compatible formats such as CityGML and KML. Additionally, it addresses key concepts in 3D geometry types, data validation, and schema mapping essential for successful BIM to GIS transformation.

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