EXTENSION OF SEA CHARTS FOR 3D VISUALIZATION

This paper presents the extension of Electronic Navigational Charts (IHO-2) for sea charts for the usage of 3D visualizations. If 2D chart data is used to build up an interactive 3D scene, the change of the perspective leads to over-crowded displays and many occlusions. We developed a data management concept by defining a hierarchical topology and semantic groupings within the 2D chart data. The hierarchy can be stored permanently in the charts, and does not affect the standard. The structure can also be used in other 3D scenarios like city models if vector-based modelling in the 2D chart is available; application scenarios are reduction of the complexity, reduction of the scene to interesting regions and semantic clustering of objects.