The Development And Application Of The TAX Management GIS Based On COM

With the popularization and improving of the technology of the computer, the geographical information technology taking information technology as support has got swift and violent development. Its range of application is increasing constantly, from new developing fields, such as traditional land utilizing, urban planning and facility managing and intellectual traffic to the electricity, telecommunication,etc. of resource management ,etc., the user range is expanded from the single government department to various kinds of enterprises and institutions too. GIS to technological means that real world understand , change the real world into the information world that can look at as one through method of model, the ones that have realized to spatial data are managed visually.The geographical information system (GIS ) utilizes the computer to turn various kinds of Spatial Information into the digital map that the vector or the grid formatted, and correspond to the spatial form of geographical information and its characteristic attribute . So the geographical information system (GIS ) is that a kind of data taking Spatial Information as the core merges the platform in fact, it orients any information correlating with goal target of the goal target and exists in the form of attribute data with the spatial coordinate, this makes data of different types regard spatial data as the tie to combine together, the information of improving the data displays ability .The Components is a kind of intelligent to independent of platform, language, agreement in each, can transplantable, reusable binary scale standard. The components is in accordance with certain interface norm, have operating nature each other. Components technology mature becoming, already become and improve software development efficiency, has raised reusable, suitability and one of the maintaining important means of the software product.In order to meet the software components trend, the system structure of GIS tends towards the components too. Traditional GIS systematic structure divide into more than two kinds the systematic structure taking spatial datum as the centre, the system shortcoming of structure to loosely organized wholly, person who integrate poor, make sure data is it spend to reply only, there is no function to reply and use. Second , regard carrying out as the systematic structure of the centre, the functions calculated and carried out all concentrate on the centre, it is quite complicated to realize, and the communication between application program and spatial data will all pass the centre, it is apt to form the bottleneck. And components technology, according to the function and using offering transparent attribute interface and method to user of the geographical information system, accomplish the using simultaneously and not sewing and integrating of the components, has increased cohesive degree between systematic flexibility and module , develop systematic efficiency and improve greatly , the degree of difficulty drops , the system has opening and integrating even more. The basic thought of components GIS is to make every big function module of GIS into the controlling part, can utilize the developing instrument of other software to integrate in form which put up the building blocks between controlling part of GIS and other controlling parts, thus form final GIS application. Utilizing components technology, users can choose the controlling part of the need according to the needs of reality, this has reduced users' financial burden to the maximum extent too.Componets GIS(abbreviates as ComGIS)on the basis of the standard components, not only can carry on freedom, flexible reorganization between each components, And the standard interface with visual interface and easy to use that melts. It is that platforms have Microsoft of mainly in components COMs( Component Object Model, target of components model) /DCOM (Distributed Component Object Models, distribute components target model) and the CORBAs of OMGs (Object Request Broker Archi...