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What is the role GIS could play in the future pervasive semantic grid service environment?

Adopting the Web Service, Grid Computing and Semantic Web technologies, Geographic Information System (GIS) have got newly development in recent years. We first present the state of art of such technologies and their applying in GIS. Then we introduced the Pervasive Computing vision and analyses the possible way merging Semantic Grid Service and Pervasive computing, forming we called Pervasive Semantic Grid Service(PSGS). To help archive the Pervasive vision, we introduced the Geographic Overlaying Grid to mediate the pervasive devices and the beneath infrastructure. After that, we put the vision forward to see how GIS would influence our daily life in the future pervasive environment. We compared the concept of Digital Earth raised 8 years age and the Pervasive environment with Geographic Overlaying Grid and showed the difference between them. Finally, we point out that GIS can be "tick point" between the cyber space and the real physical space, helping people find their way "return" to real world from virtual cyber world.