Theory and Practice from Digital City to Smart City by LI DerenrnAbstract This paper summarized the achievements in construction and development of the Smart ,City based on the wave of Internet of things including smart sensor networks and earth observation networks. This paper probed the inevitable trends and the basic theories of the development from Cyber City to Smart City, at the same time, this paper implemented the typical applications of the Smart City and also predicted the wonderful prospect of it.rn Key words Cyber City,smart sensor network, earth observation network, IOT, Smart City （ Page：1 ）
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