The Research And Application Of Mobile Geographic Information System Based On Personal Digital Assistant Group

The changes of computer science and electron technology have brought infinite energy to Geographic Information System (GIS). And mobile GIS, which based on mobile intelligent terminal has become a new research field.In this paper, we analyze currently inland and overseas status quo of the theory and the applications of mobile GIS, point out the focus needed to be explored in mobile GIS and then bring forward the research and application of mobile GIS based on Personal Digital Assistant(PDA). Firstly, from the viewpoint of system theory, we analyze the main characteristics and related techniques of mobile GIS. Secondly, we discuss the system composition and application models from the viewpoint of systems engineering. Then we put forward a practical instance of mobile GIS application based on PDA group in intelligent traffic system.The paper puts emphasis on the system logic structure pattern, spatial organization mode and spatial analysis technique of map data in PDA stage. Other keystones are system security and communication techniques between PDA and PDA, PDA and PC server. In order to solve the currency problem of mobile GIS application system, we bring out a design tactic of mobile GIS with PDA software and hardware platform independent and make it realize For the sake of application requirement in various fields, we design the groupware function of graphic system, which make second development more convenient. The system has passed the test and achieved the anticipative effect.