Research And Realization Of Embedded Geographical Information System Based On PDA

The quick development of Electronic&Information technology brings infinite energy for the Geography Information System (GIS). With the progress of micro-electronics and photoelectron technology, communication technology has come into mobile age. Mobile computation system characterized by Personal Digital Assistant (PDA) becomes more and more popular. It is not far away to combine the moving item with huge numerical space using computer and network in the shift.As a basic platform dealing with spatial information, GIS (Geographic Information System) is widely used in the domain of mapping, city layout, military affairs, and goods circulating and so on. Since GIS deals with a lot of spatial information and the request of hardware is high, it is usually used in the PCs and workstations of high configuration. In recent years, with the development of technology, GIS begins to move towards embedded equipment, such as PDA, cell-phone, etc.. the software using those equipment is called Embedded GIS.The EM-GIS (Embedded Geographical Information System) is the combination of GIS (Geographical Information System) and the embedded system. It is the offshoot and extension, the makeup and development of the traditional GIS. With the sustain of hardware platform, multi operation system, the application of GPS (Global Position System) and the technique of mobile interconnection, the EM-GIS has been applied to the economic construction and the modern national defence. The research on the Embedded-GIS is a hotspot. It is important to focus on the EM-GIS, develop correlative techniques and come into being copyright of ourselves.Embedded GIS can be widely applied to traffic, military affairs, mapping, medical treatment, automobile navigate and so on.The full text can be divided into three major parts: Summary of Embedded geographical information system; the design of the Embedded Geographical Information System; the realization of the Embedded Geographical Information System. The main content of this text is around the research and development on "the EM-GIS (Embedded Geographical Information System)". It introduces the basic conception of the Geographical Information System, some background knowledge of embedded system and the knowledge of the embedded move database, and embedded GIS technology, etc. draws the comparison among the three data models such as MapInfo. ArcInfo. ArcGIS, and also explains emphatically the key technology and implementation method of the EM-GIS, in which the embedded hardware is PDA, the embedded OS is Windows CE. In addition, the system realizes the loading or deleting, of the map in the format of shp. With deep study of the data structure of shp. shx, dbf, the issue lists the data structures of shp, shx. dbf, realizes the zooming in or out, and the shifting of the map in the format of shp, as well as the display of longitude and latitude. The system uses ActiveSync to synchronize data between PDA and computer.In the end. there is a brief introduce of system main functions. After summing up paper content, the paper points out the prospects of following work in the future.