Abstract
Abstract. An unbroken digital data flow would save substantial resources in the built environment process. In this study, which is part of a larger Swedish project, data delivery specifications and methods to integrate BIM and geodata are developed and tested with the aim to facilitate such an unbroken data flow. The main focus areas of the study are: (1) specifications that enables building permission applications based on BIM data to automate the building permission process, (2) reuse of as-built BIM models to update geodata when a building is constructed and (3) a national Swedish CityGML ADE for buildings. The study shows that building permission applications can be partly automated even though the delivery specifications were in the early stages of development at the time of a performed test case. With fully implemented delivery specifications more regulations can be checked. Furthermore, the study demonstrates how a BIM model can be georeferenced with a standard deviation of the transformation of 3 cm compared to field measurements performed with a total station. The georeferenced BIM model can then be converted to a LOD2 geodata building model to update existing geodata. Finally, a proposal for a national Swedish CityGML ADE for buildings is presented.
Highlights
Substantial resources are spent on data creation and management in the built environment process
Geodata in Industry Foundation Classes (IFC) format can be imported into BIM tools used by the AEC companies to facilitate the design of a building according to the regulations already in the design phase
When a building is designed, a sub-set of the BIM model is sent to the municipality in IFC format according to a building permit model view definition (MVD) to support aim 2
Summary
Substantial resources are spent on data creation and management in the built environment process. This study is part of one of those projects and concerns data delivery specifications for some data exchange processes: delivery of 2D and 3D geodata from municipalities to AEC companies, delivery of data for building permit applications as well as as-built BIM data from the AEC companies to the municipalities (Figure 1). These delivery specifications are created in an iterative process where draft specifications are designed and tested in various case studies. The main aims of the project are to: 1) standardize the geodata used for the detailed design of buildings 2) increase the automation level in the building permit process
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