| Development has entered the era of mobile computers, notebook computers represented in Pervasive Computing system is increasingly deepening people's lives. In real-time, mobile access to information, using information , as well as seamless integration of the mobile carrier and huge geographic information space, digital spatial through wireless network dynamically is no longer a dream.The purpose of this paper is, using prosperous Pervasive Computing technology, combining Mobile Map technology, to develop an embedded geographic information system (eGIS) suitable for individual users, and build a spatial information visualization system, based on General Packet Radio Service (GPRS), a mobile communications network. The system has satisfied the visualization, query and analysis of spatial information. Besides it is more important to provide a dynamic update and wireless downloading for basic GIS data. According to the current situation of the GPRS network and an embedded feature, compresses the eGIS data based on the methodology of dictionary, and then transmission through GPRS and storage in an embedded system. The research of the paper involves the science of surveying and mapping, including map database, spatial data analysis, map projection, global satellite positioning, and the computer science, including the embedded developing, mobile computing, GPRS wireless networks, lossless compression of vector data technologies, and so on.The research status quo of applied eGIS home and abroad is analysed in this paper, based on which , the shortcomings and deficiencies are outlined in this area. Response to those deficiencies, the research contents of this subject are proposed here, which includes the following four areas : (1)the GIS platform framework based on GPRS network;(2)the key technologies of eGIS software development under μClinux environment, including system platform and application software design and implement;(3) compression of GIS vector data in the embedded system;(4) improvement of the GIS data space analysis... |
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