Besides visual interfaces have little utility for visually disabled people who can benefit from a speech interface. For example, they may not be suitable for field devices such as PDAs where the screen space is limited. However, visual interfaces alone have their limitations. In our earlier work we have developed a visual query interface for a mobile geo- spatial visualization system. Spoken language input/output is a very effective means of communicating with the machine. We also present some results of practical experiments that have been carried out with this system embedded in a vehicle. It ensures real time access to local GPS data, but also to multimedia and spatially referenced data which are stored on distant servers. As it is used in the context of a mobile application, the basic software component in the architecture of our system is a local embedded server. A Web browser and a Java applet are used for data integration and visualization. A cellular phone with an Internet based connection permits to access distant data sources and to transfer data between the components of the system. This system uses a differential Global Positioning System (GPS) device to acquire the position of a mobile (e.g. Its main characteristics concern the possibility to access various information sources and to provide the basic functionalities of a navigation system, e.g. In this paper we investigate the development of an embedded and mobile geographic information system.
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