Abstract Differences in the scope and intent of the contrasting IFC and CityGML data formats entail that converting the former to the latter results in loss of information. However, for some use cases it is beneficial to keep also particular information from IFC that is not native to CityGML, and achieving that requires mechanisms such as the CityGML Application Domain Extension (ADE). We develop an ADE to support retaining relevant information from IFC. Besides being driven by the particular source of the input data (IFC), this multi-purpose ADE is shaped after a discovery process that involved examining potentially applicable use cases in Singapore, doubling as an extension that is adapted to a set of use cases and the local geographic context. We implement the conceptual work by generating an enriched dataset (with an automatic conversion from IFC to CityGML), visualising it, and discuss its added value in a use case.

中文翻译：

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为 IFC 来源的 3D 城市模型扩展 CityGML

摘要 对比 IFC 和 CityGML 数据格式的范围和意图的差异意味着将前者转换为后者会导致信息丢失。然而，对于某些用例，保留来自 IFC 的非 CityGML 原生的特定信息是有益的，并且需要诸如 CityGML 应用程序域扩展 (ADE) 之类的机制来实现这一点。我们开发了一个 ADE 来支持保留来自 IFC 的相关信息。除了由输入数据的特定来源 (IFC) 驱动之外，这种多用途 ADE 是在发现过程之后形成的，该过程涉及检查新加坡潜在适用的用例，加倍作为适用于一组用例的扩展和当地的地理环境。