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isprsannals II 2 W1 75 2013

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Figure 1. The CityGML data model for the multi-scale representation of tunnels (Source: (Gröger et al
Figure 2. Illustration of the geometric representation of tunnels on different LoDs (Source: (Gröger et al
Figure 3.  Examples of semantic objects for boundary surfaces in tunnels. In LoD2-4 only the outer surfaces (WallSurface,  RoofSurface, GroundSurface, OuterCeilingSurface and OuterFloorSurface) are available while the interior surfaces(InteriorWallSurface,
Figure 4. Separation of geometry and semantics in the IFC data model; different geometry representations provided by the IFC
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