tailieunhanh - Dynamic and Mobile GIS: Investigating Changes in Space and Time - Chapter 2

Điện thoại di động công nghệ thông tin ĐÃ nổi lên từ sự kết hợp của truyền thông Internet và không dây. Sự kết hợp này Cung cấp dịch vụ thông tin thông qua thiết bị đầu cuối di động và bất cứ lúc nào, bất cứ nơi nào. Mobile GIS, Tự bản thân, Comes Into Là Bất cứ khi nào dịch vụ thông tin di động và GIS được kết hợp. Mobile GIS ĐÃ các đặc điểm sau: | Chapter 2 Opportunities in Mobile GIS Qingquan Li State Key Laboratory of Information Engineering in Surveying Mapping and Remote Sensing Wuhan University P. R. China Introduction Mobile information technology has emerged from a combination of the Internet and wireless communication. This combination provides information services via mobile terminals anywhere and at anytime. Mobile GIS itself comes into being whenever mobile information services and GIS are combined. Mobile GIS has the following characteristics 1. Mobility. Mobile GIS can operate on many kinds of mobile terminals that offer mobile information services to users through the interaction of wireless communication and remote servers. This makes GI constantly available for those such as field personnel maintenance operatives etc. who are always on the move. 2. Dynamic and operating in real time. As a service system a mobile GIS responds to users requirements and provides dynamic and current information about for example accidents travel status and traffic jams. 3. Supports applications. In daily life more than 80 of available information relates to spatial position the geographic information resource is abundant and dispersed. Analysing this information and serving dispersed applications is the core task of mobile GIS. 4. Depends on location information. To provide mobile services mobile GIS requires knowledge of the location of users in real time. 5. Diverse mobile terminal technologies. There are various classes of terminals including mobile computers personal digital assistants PDAs mobile telephones beep pagers and vehicle terminal devices. Furthermore because of different manufacturers different technologies and the fact that both spatial and non-spatial information is transmitted to and from terminals technological diversity is further augmented. Therefore the arrival of mobile GIS can be considered to be GIS s new age . Because of the above characteristics mobile GIS builds up the professional