Wireless technology appliedto GIS

At present, there is a growing interest in wireless applications, due to the fact that the technology begins to support them at reasonable costs. In this paper, we present the technology currently available for use in wireless environments, focusing on Geographic Information Systems. As an example, we present a newly developed platform for the commercialization of advanced geographical information services for use in portable devices. This platform uses available mobile telephone networks andwireless local area networks, but it is completely scalable to new technologies such as thirdgeneration mobile networks. Users access the service using a vector map player that runs on a Personal Digital Assistant with wireless access facilities anda Global Positioning System receiver. Before accessing the information, the player will request authorization from the server anddownloadthe requestedmap from it, if necessary. The platform also includes a system for improving Global Positioning System localization with the Real Time Differential Global Positioning System, which uses short GSM messages as the transmission medium. r 2004 Elsevier Ltd. All rights reserved.

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