With High-technology and society being developed rapidly, there is a trend which is from digital earth to smart earth. Moreover, smart city is one of most important work in smart earth. Therefore, how to realize or design smart city leaves much to be desired. This paper puts forward some strategies and architectures for designing smart city based on geo-spatial information science and technology (GPS, GIS and RS), IT, communication technology, network technology (smart sensor web and ubiquitous sensor network), spatial data mining, high perform...