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1 3 D Terrain visualization for Web GIS

The Web has become a new medium which can display geographical information in rich forms and offer user-friendly interfaces. One of the promising trends in current Geographical Information System (GIS) is the use of Web 3D technology, especially VRML (Virtual Reality Modeling language). As one of the most fundamental geographical information, terrain information is often presented as the base for the display of other information, such as urban buildings, streets, population density, distributions of specific plants and so on. However, the 3D visualization of terrain on Web is a disaster for low bandwidth network users because of the large amount of data it involves. In this paper, we proposed and implemented a tile-based selective visualization method to facilitate 3D Web surfing. This tile concept also helps to develop a geo-information query system based on 3D terrain visualization. A Web GIS prototype has been designed and implemented featuring a hybrid 2D-3D interface.