Design And Function Realization Of Population Statistic Geographic Information System Based On Component Technology

Population problem is the major issue affecting sustainable development of the human being in the 21st century. As the largest population country in the world, the Chinese population is approaching to the natural environment capacity limit decided by present science development situation. Many economic and social developing questions such as the relative insufficiency of resources and the smallness of environmental carrying capacity caused by population can't be changed in short time. The most important for the solution to the population problem is to grasp the population information comprehensively. Little has been involved or mined in the population spatial distribution characters by traditional method, while the geography information is closely related to resources, environment and economy, ect. Therefore, the integration of population and geographic information not only can raise the level of population information management, but also can develop a new approach for the service and application of population information. It is beneficial for the research on population rule and the establishment of population policy, as well as serves for the all-round construction of a well-off society and the building of socialism harmonious society. As a highly effective application tool of the population information and the geographic information integration management, Population GIS is very favored to the public based on the powerful spatial analysis and the visualization functions. In view of an important branch of population GIS, Population Statistic GIS is discussed in this thesis.In the aspect of content, based on the brief review of the development of population GIS and the present research hotspots, the thesis firstly compares the developing modes of the GIS software, proposes that the Component developing technology is the current tidal of the GIS software industry, and discusses the Component technology, ComGIS, MapObjects, ADO.NET as well as developing platform VB.NET and other related technology in detail. Secondly,taking the county-based population statistic GIS of Anhui as a study case, the software demanding analysis, index and model design, the system goal, system framework, function design and database design are introduced in detail. Finally, the core algorithm and procedure realization of the system main functions are given out. In the aspect of technology, the general process of GIS software engineering is followed. At the system programming stage, the system adopts the C/S three construction patterns, uses Visual Basic.NET as the front developing kit, and takes MapObjects as the GIS Component and SQL Server2000 as management platform of attribute data in background while spatial data is stored in the form of shapefile format in the system. The accession of attribute data and spatial data is realized through ADO.NET and MapObjects separately, and the integration of relational database and spatial database is realized through OLEDB connection and MapObjects Data Connection interface.In the aspect of application, the system applies the Relationship Database technology, the mathematical model, the GIS technology to population statistic information management. Thereby, it achieves the integration of the population statistic information and the geography spatial information, realizes the functions of map browsing, statistics inquiry, thematic mapping and model analysis, and enhances the population statistic information's expressiveness, which will further promote more applications of population statistic GIS in the correlated domains. Under the .NET Framework the author develops Valiate.dll, a debarkation component, CDatabase.dll, a database operation component, as well as Lorenz module, Population Pyramid module, matrix operation class module of GM(1,1) population forecast, and spatial weight matrix creating module, are developed based on GDI technique. These modules have some important characteristics, such as cross-language application, code reuse and so on, which can offer experience and technical reference for similar system development.