We propose and describe a method for the estimation of the energetic rehabilitation state of buildings. It combines a virtual 3D city model with real measured heating energy data in order to determine energetic relevant building characteristics. Among these characteristics are, e.g., the volume, the assignable area, the building type or the surface-to-volume ratio (S/V). Using these values the ...

High-quality geographic data sources are eminent for urban data management and the creation of detailed 3D city models. In the last two decades, Volunteered Geographic Information (VGI) increasingly gained attractiveness to both amateur users and professionals, resulting in a broad availability of urban data within VGI communities and especially OpenStreetMap (OSM). OSM provides detailed inform...

Abstract. This study aims to clarify the development and utilization of highly accurate open 3D city models (3DCMs), which began in Japan 2020. The background project is explained based on a review past efforts for making geospatial information accessible, flow data standardization around CityGML, introduction Free Open Source Software Geo-spatial (FOSS4G) tools management visualization. Two as...