This paper describes a CityGML Building Interpolation tool (CityBIT) for the creation of userdefined and interpolated building models for planned and/or existing buildings. A brief explanation of the tool's functionalities and the methodologies adapted to develop the tool are explained in this paper. The CityBIT aims to help urban planners and simulation scientists to facilitate CityGML model developments for energy performance simulations.
Urban Building Energy Modelling (UBEM) requires adequate geometrical information to represent buildings in a 3D digital form. However, open data models usually lack essential information, such as building geometries, due to a lower granularity in available data. For heating demand simulations, this scarcity impacts the energy predictions and, thereby, questioning existing simulation workflows. In this paper, the authors present an open-source CityGML LoD Transformation (CityLDT) tool for upscaling or downscaling geometries of 3D spatial CityGML building models. With the current support of LoD0–2, this paper presents the adapted methodology and developed algorithms for transformations. Using the presented tool, the authors transform open CityGML datasets and conduct heating demand simulations in Modelica to validate the geometric processing of transformed building models.
With an upsurge in the energy demand throughout the globe, efficient energy simulations and smart energy management solutions are imperative. Often a lack of substantial 3D geometrical data restricts simulation scientists and urban planners to analyse energy demand patterns on a city scale. Therefore, in this paper, the authors describe an open-source CityGML Building Interpolation Tool (CityBIT) for the creation of user-defined and interpolated CityGML LoD2 building models for planned and/or existing buildings. CityBIT can be used to generate CityGML models with different roof types, orientations and elevations. A brief explanation of the tool’s functionalities and the methodologies adapted to develop the tool are explained in this paper. CityBIT aims to facilitate CityGML geometric model development focusing on urban-energy performance simulations.
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