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Location Based Service (LBS) has been considered as the most potential part of wireless value-added services. However, the development of LBS, which needs lots of data to transmit, is strictly limited because of the limited bandwidth of wireless network. With the emergence of 3G, wireless network speed is greatly improved, which will provide more information to users easily, and hence LBS will be greatly promoted. GIS (Geography Information System) plays an important role in LBS, providing map service, routing service, geo-coding/ decoding, computing and analysis. Map service is the most important service provided by GIS, with which map can be displayed well and LBS information can be shown conveniently.
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