Abstract
Abstract. The 3D BAG v. 2.0 dataset has been recently released: it is a country-wide dataset containing all buildings in the Netherlands, modelled in multiple LoDs (LoD1.2, LoD1.3 and LoD2.2). In particular, the LoD2.2 allows differentiating between different thematic surfaces composing the building envelope. This paper describes the first steps to test and use the 3D BAG 2.0 to perform energy simulations and characterise the energy performance of the building stock. Two well-known energy simulation software packages have been tested: SimStadt and CitySim Pro. Particular care has been paid to generate a suitable, valid CityGML test dataset, located in the municipality of Rijssen-Holten in the central-eastern part of the Netherlands, that has been then used to test the energy simulation tools. Results from the simulation tools have been then stored into the 3D City Database, additionally extended to deal with the CityGML Energy ADE. The whole workflow has been checked in order to guarantee a lossless dataflow.The paper reports on the proposed workflow, the issues encountered, some solutions implemented, and what the next steps will be.
Highlights
Semantic 3D city models are being generated and adopted more and more by municipalities as they can represent – spatially and thematically – all most relevant urban features, e.g. ranging from buildings to vegetation, transportation, relief, water bodies, etc
The CitySim solver works with its own data model (CitySim XML file format), the GUI offered by CitySim Pro supports import of CityGML files, and export of CityGML with Energy ADE content, conceptually similarl to SimStadt
Once simulation results from both SimStadt and CitySim Pro were exported and stored as CityGML files with Energy ADE, the following step consisted in testing how to store these data into the 3D City Database
Summary
Semantic 3D city models are being generated and adopted more and more by municipalities as they can represent – spatially and thematically – all most relevant urban features, e.g. ranging from buildings to vegetation, transportation, relief, water bodies, etc. The 3D BAG dataset is available as open data and can be downloaded in different formats (e.g. CityJSON, GeoPackage and OBJ) from the webbased 3D Viewer (Figure 1, bottom). As such, it represents a new and ideal test dataset to further test and experiment with the data, and to develop urban applications based on it (Doan et al, 2021). The focus here is not on developing such applications, but to first test the quality and suitability of the 3D BAG data for this purpose For this reason, in this first stage, existing software packages will be used, focussing on the respective data requirements and the generated outputs. Given the energy-based nature of the output results, the compatibility of the 3D City Database itself for storage of CityGML Energy ADE (Agugiaro et al, 2018) contents is tested
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