详细介绍了云计算的理论、特点及国内外发展趋势.探讨了在软件即服务(SaaS)的理念下,以云计算为架构的地理信息系统(GIS)的发展趋势.%The theory、characterislics、development trends of Could Computing were introduced explicitly. With the concept of software as a service(SaaS)being more and more recognized, the GIS development trends were discussed, taking the Cloud Computing as its architecture.
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