Research And Reacization Of Digital Map In The Mode C/S

Digital map produce and apply all the information in the map on computers, that is, digital map organize, store and manage the map information digitally. Digital map, which are composed of coordinates of locations, attribute coding and certain data structure, are displayed and stored in the computer as a set of date. They are also displayed on the monitor and printer as colorful intuitive map.Digital map are dynamic, for their contents and effect can be modified at real-time. Digital map are flexible, for their information can be applied in statistical analysis and decision making. Digital map are expressive, for their details can be combined with graphs, sounds, words and videos to provide multi-media digital map. Digital map is able to support various functions such as spatial query, spatial analysis and attribute management. With the continuous advancement of Internet technology and increasing demands for Digital map, integrating of Digital map and network technology, publishing spatial data, providing spatial data display, query and analysis functions to users become the inevitable development trend to Digital map.The paper starts with the study for technology used in integrating digital map, analyzes the current situation and promising trend home and abroad in applying digital map, and elaborates on the theories and technologies of developing digital map. The paper takes the digital map in the mode of C/S as an example to illustrate the main issues in setting up the digital map and their solutions. These main issues include the collection and entry of geographical information, the design of spatial database, vectoring grid map, binding data, detailing map layer, hawk-eye technology, and creating map files automatically. The system accomplishes network access from client to server and achieves multiple functions, the users complete operations of the geographic objects in the management information platform with functions of Digital map and the system achieves map display, map zoom, layer control, professional query, editing(deleting, adding, modifying) geographic data and so on. The paper also introduces the process of designing digital map and their demands for software, hardware and operating system; according to the database system security model, the paper discuses the security problem in SQL Server database. It also analyzes security problems that may exist and offers some specific solutions an d suggestions to enhance database users’security consciousness. At last the paper ends with some suggestions for certain improvements in the digital map.