An approach for data extraction, validation and correction using geometrical algorithms and Model View Definitions on building models

Johan Luttun, T.F. Krijnen

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Abstract

The Industry Foundation Classes (IFC) cover a wide variety of subdomains in the construction industry. Model View Definitions (MVD) enable to specify a subset of the IFC schema to assess the content of a model for specific use cases and information exchanges. However, IFC and MVD paradoxically complexify the workflow since it requires a deep understanding of the schema combined with construction knowledge to carry out simple use cases such as quantity checking or data export. This gap between domain specific queries and their expression in a computer-readable language weakens the opportunities provided to the building industry by Building Information Modeling. Our research consists in the implementation of MVDs in a high-level programming language to extract data from building models, an assessment of the extraction results and geometrical processing algorithms to correct the explicit quantities and properties that are supplied as metadata alongside the elements in IFC building models. Geometrical processing can be used to reduce and eventually correct errors on property values. We use a generic geometrical representation of IFC entity instances and apply geometrical transformations on those to obtain geometrical shapes. Boolean operations are used to identify relationships between elements. Eventually, incorrect data values are corrected directly in the IFC models accordingly to the IFC schema. For instance, we authored an MVD to extract data pertaining to external walls from different IFC models and corrected the value of the IsExternal property of the models’ IfcWall entities. This use case is of great importance for the cost estimation of a thermal renovation on a building as it gives a good estimate of the outer surface area of the building envelope.

Original languageEnglish
Title of host publicationProceedings of the 18th International Conference on Computing in Civil and Building Engineering (ICCCBE 2020)
EditorsEduardo Toledo Santos, Sergio Scheer
Place of PublicationCham, Switzerland
PublisherSpringer
Pages529-543
Number of pages15
ISBN (Electronic)978-3-030-51295-8
ISBN (Print)978-3-030-51294-1
DOIs
Publication statusPublished - 2020
EventICCCBE 2020: 18th International Conference on Computing in Civil and Building Engineering (Online) -
Duration: 18 Aug 202020 Aug 2020

Publication series

NameLecture Notes in Civil Engineering
Volume98
ISSN (Print)2366-2557
ISSN (Electronic)2366-2565

Conference

ConferenceICCCBE 2020: 18th International Conference on Computing in Civil and Building Engineering (Online)
Period18/08/2020/08/20

Keywords

  • BIM
  • Checking
  • Geometry
  • IFC
  • MVD

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    Luttun, J., & Krijnen, T. F. (2020). An approach for data extraction, validation and correction using geometrical algorithms and Model View Definitions on building models. In E. Toledo Santos, & S. Scheer (Eds.), Proceedings of the 18th International Conference on Computing in Civil and Building Engineering (ICCCBE 2020) (pp. 529-543). (Lecture Notes in Civil Engineering; Vol. 98). Springer. https://doi.org/10.1007/978-3-030-51295-8_38