BIM-GIS integration has been discussed for many years, but only a few research studies and practical applications have been completed in Hong Kong. As per the local BIM standard, LoD-G 200 is sufficient for the requirements of GIS planning and analysis. Therefore, this research aimed to streamline the model transformation and simplification from the BIM domain to the GIS domain, automate and systematise the data filtering for model transformation, and build an open-sourced prototype for BIM-GIS transformation via a low-code application called Dynamo in Revit. This paper reviews the exterior shell extraction algorithm proposed by the HKUST BIM Group but focuses on using Dynamo to achieve the purpose. Since Dynamo is common in the local industry, it is easier to understand and further improve the BIM-GIS integration locally. Based on the outcome of this research, auto-transformation has been successfully developed. Compared to the existing workflow to create a simplified model in the GIS domain, the application of auto-transformation is expected to reduce by over 50% the time spent and the number of modellers required. Also, users can easily customise the selection for autotransformation. Additionally, this paper provides guidance and corresponding recommendations for the further development direction.
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