A Study Of DLG Data Converting

With the development of information social, computer is not only carried out science calculate but also can carry out dealing with a large of data easily,for example data's and refresh,make the computer's application extend from the science research department to entailment,department, as a result,the database technique is produced,data techinique is important entrance in the computer applicational field,its coral task is carried data management,now it has formed quite a few scale technic system and using technique.Before the spatial database, the management way of most database adopt document system .way .this kind of data management method have already appeared the data management the maintenance difficulty in the application, the speed of the data access the database is slow the single customer data erupts to share the conflict and so on ,in order to avoid above problem ,the second geography system adopt a kind of efficient data management mode, namely ArcSDE(spatial data Engine) and relation database integration management 's mode, the spatial data and attribute data can be managed uniform by ArcSDE spatial data Engine and SQL relation database, and make use of the ArcSDE and Visual Basic++ to carry out the river valley spatial information search and analysis function ,achieve compositive spatial data management and high-efficiency information search 's goal, at the same time, the information that resources environment ,society economy ,natural geography and so on is carried out the uniform management, and it provide the decision support to the farsighted development target and strategy of the rival valley.At present there are some general problems in the application and universality of GIS in the world, such as data format. This paper aims at using advanced developing ideas and technical means to solve the existent data problems of GIS when carrying out system developing and design.Computers are used so widespread that everyone can find the great change they bring to us. The hardware and software are spring up everywhere. It can say that we can make many programs as well as you can think. The author designs a bus system program of, whichis made by VB, the program is useful to people's daily life, work, and tour.ArcGis is useful softwares, it is enjoyed by many programmer because they are easy to study and practice. The two are fully used when the author designs this program, and they benefit the author much. VB is a popular program language. Compared with other program language it has two obvious features, meanwhile it is easy to understand, especial for the apprentice, For these characters the author chose the VB to design his fist program.The article describe the basic character and the function of ArcGis and VB, and the use method and character of the program, which are described fully by the author who even list some pictures that are convenient for reader to use.The operation process that should design, is to pass original map passes to scan, input the data in the map to the computer management, software ArcGIS within the application geography information system is a terrace, face map in order of the token geography main factor, line, of data carry on the processing, in the ArcCatalog, build up the database need, in chase need of database add carry the map that the demand handle, then can carry on the vector towards order, line, the geography main factor that face. Thus completed to become original document conversion.The document of the form of shp.Thus completed the process that vector tum.Should operate the design of the process is to combine data and maps organically, turning the process to need the data converts into through a vector of format.lt rose the count for much function in to it hand over the processing of the data.After applied, the program work very well .It can run in all windows system.The paper systemically explains the whole process of data analysis, data conversion and data import, and realizes the process using object-oriented method and component-based technology. In practice of establishing fundamental Geographical Information System of S City, general design is given to the system development first. Then class modules of system are programmed with the object-oriented language of Visual Basic. Finally the paper gives the evaluation about solving the system problems.