The Storage Technology for GIS Data Realization

The format of space data used in Geographic Information System (GIS) is different currently, therefore, exchange the GIS data among different GIS applications is not very convenient. In order to solve the problems, we take three methods. Firstly, the storage format of the shape document series (*shp, *shx and *dbf) is analyzed. Secondly, we study the technologies and methods of changing the shape document into XML file. Exchanging the format between the shape document and the XML file is realized. Thirdly, the methods of storing GIS spatial data as XML in DB2 9 are studied by using the extension function for XML in RDBMS, a data access middleware is designed and implemented to realize storing the GIS spatial data in DB2 9 as XML. Finally, the method of storing the GIS special data as an ordinary table in the RDBMS is introduced, managing the shape document in relational database is implemented and the correlated map display process is also studied, at the same time, the method to improve the speed of access the GIS spatial data is introduced. The study shows that the technologies and methods are of great significance to some GIS applications