This paper discusses the transformation problem from relational schema to Object-orient-ed schema,which is one of the important aspect of heterogeneous federated database system,andobject-oriented data model is a good...This paper discusses the transformation problem from relational schema to Object-orient-ed schema,which is one of the important aspect of heterogeneous federated database system,andobject-oriented data model is a good candidate for global data model.展开更多
This paper analyzes the key technology of mobile GIS development, discusses the design method of mobile GIS spatial data management, visualization of spatial data And Spatial data query, tinder Object oriented mode. A...This paper analyzes the key technology of mobile GIS development, discusses the design method of mobile GIS spatial data management, visualization of spatial data And Spatial data query, tinder Object oriented mode. And we develop a set of mobile GIS basic software platform in the Android platform, and tested in the mainstream smart mobile phone with Android operating system, test results show that the software platform can run smoothly. Other users can development a variety of mobile GIS to call the platform through an application service interface.展开更多
文摘This paper discusses the transformation problem from relational schema to Object-orient-ed schema,which is one of the important aspect of heterogeneous federated database system,andobject-oriented data model is a good candidate for global data model.
文摘This paper analyzes the key technology of mobile GIS development, discusses the design method of mobile GIS spatial data management, visualization of spatial data And Spatial data query, tinder Object oriented mode. And we develop a set of mobile GIS basic software platform in the Android platform, and tested in the mainstream smart mobile phone with Android operating system, test results show that the software platform can run smoothly. Other users can development a variety of mobile GIS to call the platform through an application service interface.