All components of a 3D city model have to be transformed into a common geographic coordinate system.Ī database for 3D city models stores its components in a hierarchically structured, multi-scale way, which allows for a stable and reliable data management and facilitates complex GIS modeling and analysis tasks. OBJ), and 3D scenes (e.g., Collada, Keyhole Markup Language) such as supported by CAD, GIS, and computer graphics tools and systems. The Components of 3D city models are encoded by common file and exchange formats for 2D raster-based GIS data (e.g., GeoTIFF), 2D vector-based GIS data (e.g., AutoCAD DXF), 3D models (e.g. There is no single, unique representation schema due to the heterogeneity and diversity of 3d city model contents. To store 3D city models, both file-based and database approaches are used.
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