The Research Of Auto Map Generalization On Mass Geographic Spatial Vector Data

Along with the field of appliance in GIS have been continuous enlarged and the hiberarchy's requirement have been enhanced.People more and more required be observed, comprehend and description for the geographic phenomenon on different resolving power and different special scale.Namely, People required analysis, disposal and expression of the Multi-Scale special data more and more.All of these conduced to the notion of Scaleless map,Then brought forward new requriment as held up the Scalesess map's exploitation and application for the theoretics and technology of the Auto Map Generalization.The thesis for the real-time display of mass geographic spatial vector data, On the basic of analyzed the characteristic structure, researched strategy of vector data's framework and manage.and the emphasis was the Auto Map Generalization during building of the data.Included:1 The framework of the mass geographic spatial vector data.The thesis brought forward the nass vector data's memory and manage,and researched the dispartment and the join of the data.2 The Auto Map Generalization of the normal geographic factors.The thesis researched the generalization of point, line, face, discussed rule and way of the three factors's generalization, researched the line's predigestion, just as nth,Douglas , geometry gradually etc. And researched two or three of them particularly.3 Special Auto Map Generalization of the special feographic factors.The thesis researched river system and contour line two representational factors.Constitute a series of rule and way for their special structure.and validated the feasibility of these rules on experiment.