The Research On Quantities Of Map Data Process In Power Information Systems

Along with the application extends of GIS, how to deal with the space data in software and hardware is always highly anticipated. According to the seamless principle of GIS, this thises is based on the project of the Transmit Electricity of GIS Map Data Processing Technique in Hunan Province.The thesis sums up the techniqual characteristics of Maplnfo, the ways of mapping organization and the exchanging format of data. The weakness of Maplnfo is pointed out in addition. It neither can express the 3D data nor the topological relationship. It has to get the information by the exchanged data for the format of information is not opened to the public.According to the seamless principle of GIS. It provides the methods of whole main factors with simple conterminous realization to satisfy the users' need for information service in macro system, inside system and microcosmic system etc. It means that the method can process many kinds of scale convertion in portrait and also breaks the boundary of map-in-map in landscape orientation. So the connection of the data is realized.Based on the analysis of the current spatial index method characteristics, a kind of partition index file method is designed. As assistance data structure, the spatial index lies between the operating algorithm in space and the geography objects. Through filtering amounts of independent special space geography objects are removed, the choosed objects are oriented quickly, the speed and efficiency of the space operation is advanced in result.Aiming at the data format of Maplnfo has to topological structure, in order to realize the need of system topological research's, there are two kinds of solution that has been used. Firstly, In order to realize the topological relation, the thesis makes use of the method that Maplnfo data format changes into the exchange format data. Secondly, the thesis expounds the algorithm automatically to the topological relation transaction after the map-sheet concatenation. The topological relation on the space data in the GIS has the important meaning to the space analysis to the data processing.The thesis established the fast display mechanism about the conjunction of map-sheet electronic map. The electronic map is a kind of valid way that influences the feature about the space message, which obtains extensive application related with date space technology, multimedia technology, hypertext technology etc. As the informationcarry, the electronic map's display speed directly influences the confidence degree that the user has to the related exploitation software.At last, the thesis points out the problem that needs to research further.