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With the increasing popularity of global on-line mapping web applications (e.g. Google Maps, Microsoft Virtual Earth, Yahoo Maps), Tile-Map technique is widely used. Map tiles are a set of map images that have been pre-generated based on geographic vector data and the adoption of tile-map technique in the developed system dramatically decreases the loading time consumed for high quality image visualizations. With this technique, the geographic data (including raster data, vector data and attribute data) of WebGIS face great potential security challenge. This paper also analyzed the disastrous result that the security leak may bring.
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