Research On Stitch And Amalgamation Technology Of Mass National Geographic Map Spots Based On Block

The first national census geography is a major national survey today.It is an important way to master the spatial distribution of physical geography and human geographical elements.Map spot reflects natural attributes and conditions of the geographical conditions in the surface of natural and artificial creation.It is an important base map of the geographic conditions surveying result map.However vary departments need different degree and scale of geographical conditions.To meet their needs,using cartographic generalization to produce a new database in different scale or different thematic based on original database scale is crucial.The spot data is full coverage,not cracking and not overlapping in geometric,it also has abundant attribute information.Combined with the content of cartographic generalization,the small figure,long and narrow spot are the main objects.According to the type of the cartography generalization of the map spots,amalgamation is selected as the main research content of this paper.The main topic of this paper includes 4 aspects.First,sum up the comprehensive knowledge,rules and technical requirements starting from the automatic synthesis.Second,the neighborhood relation analysis model and skeleton line optimization algorithm are proposed to optimize the fusion process,and the efficiency of fusion and the accuracy of the result are improved.Third,in view of the large number of spots,made some roles to split the data into blocks.Then,different blocks are amalgamated at the same time to improve the efficiency.In the end,aiming at the error caused by data amalgamation at the boundary of the region,the model is divided into different patterns and mended according to the patterns.The mending operation guarantees data space consistency and topology integrity.