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Quick overview Geo-BIM project in the Netherlands

9c7f843b850f4e4beeb53c93893c4ff0?s=47 Hugo Ledoux
September 11, 2017

Quick overview Geo-BIM project in the Netherlands

Presentation at the OGC meeting in Southampton 2017-09-11

9c7f843b850f4e4beeb53c93893c4ff0?s=128

Hugo Ledoux

September 11, 2017
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  1. Quick overview Geo-BIM project in the Netherlands Hugo Ledoux, Ken

    Arroyo Ohori, Thomas Krijnen, Jantien Stoter 2017-09-11
  2. Many different perspectives on the issue 2

  3. Our initial goal 3 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 +
  4. Bridging the gaps between IFC and CityGML 4 1. gap

    in semantic 2. gap in geometry/topology 3. gap in coordinate reference systems unlike most other similar initiatives, geometry is our main concern
  5. Representations of the geometry 5 Figure adapted from Kolbe and

    Plümer (2004) explicit representation implicit representation (need to be discretised to be manipulated with GIS objects) CityGML IFC
  6. IFC vs CityGML 6 Figure Nagel et. al (2009)

  7. Results with current commercial software 7 most geometries are converted

    IFC CityGML
  8. Our conversion methodology 8 a CityGML LoD3 shouldn’t have “thick”

    walls
  9. step 2: geometric transformation 9 input IFC union of all

    solids removal interior
  10. We got hold of newly designed building in NL and

    tested our approach
  11. 11

  12. 12

  13. None
  14. #

  15. IFC models are rigged with errors, and we don’t see

    this improving soon…
  16. IFC models = CSG computations that can go bad… 16

    2 roof parts do not touch wall and ground overlap
  17. IFC models = CSG computations 17

  18. But, hey, we learned a lot!

  19. We’re making specific recommendations 19 1. How to construct valid

    volumetric objects 2. How to avoid self-intersections 3. Where IfcSpaces should be used 4. Which Ifc classes should be used 5. How to correctly georeference
  20. They will be published soon 20

  21. www.eurosdr.net European Spatial Data Research EuroSDR….. • … organisation for

    European spatial data research EuroSDR 3DSIG: 12 NMCAS collaborate on issues of common interest (since 2013) Crowd funded EuroSDR project GeoBIM • Aim: • To develop common view on how individual, highly detailed BIM- models can be best integrated in geo-databases with topographic data at lower levels of detail • Driven by use cases and experiences in the respective countries (like the presented work in NL)
  22. www.eurosdr.net European Spatial Data Research Deliverables • The optimal strategy

    to maintain one digital view on the built-environment and identification of technical developments needed to achieve this • Requirements for BIM-data to be used in geo-domain and vice versa to support the uses cases • Understanding on how to derive such data from BIM-data respectively geo-data • Modelling guidelines for BIM-data designers so that the BIM data can be better understood/imported in geo applications and vice versa
  23. www.eurosdr.net European Spatial Data Research Partners: • Ordnance Survey UK,

    Swisstopo, Ordnance Survey Ireland, Kadaster, ICGC Catalonia, GUGiK Poland, IGN Fr, IGN B, Lantmateriet Sweden, NLS Finland Time path: • November 2017: workshop to identify the stat-of-the-art in the 10 respective countries; define the uses cases and project plan • 2 years project Collaboration: • With national and international standardisation bodies More information: j.e.stoter@tudelft.nl Organisation
  24. Code is open-source + results ain’t that bad 24

  25. Our results 25

  26. Our results 26

  27. Our results 27

  28. thank you. Hugo Ledoux 3d.bk.tudelft.nl/hledoux h.ledoux@tudelft.nl