The Joint Update Research And Implementation Of Multi-scale Spatial Data Based On The Matching Of Geographic Entity

With the acceleration of China's economic construction and social development,the construction of digital cities and digital provinces has also been accelerated,meanwhile,The basic geographic data of multi-tenses,multi-scales and multi-categories is accumulated,People update spatial data more frequently and the consistency of geographical data is further improved,the data volume and workload of basic geographic data updating are increased.The multi-scale spatial data's joint updating describes the mechanism of updating identical geographic entity in other scale databases synchronously when some geographical entities in a scale database change.That is,the geographic information data of a scale can be updated rapidly and synchronously with the geographic information data of a variety of scales,and the joint updating technology can guarantee the consistency of geographical data.As the key technology of multi-scale spatial data's joint updating,multi-scale geographic entity matching technology established the connection between different identical geographic entities based on multi-scale geographic entity database.This article studies the correlation theory and algorithm of multi-scale spatial data's joint updating mechanism and multi-scale geographic entity matching technology.The main contents of this paper are as follows:1)Discussing the concept,characteristics,logical structure,data content and classification of geographical entities.2)The definition,research agreement,matching process,matching strategy and similarity index of geographic entity matching are studied,the matching processes and methods of multi-scale spatial point entities,polyline entities and polygon entities are also studied.3)A multi-scale spatial data's joint updating mechanism based on geographic entity matching is proposed.The overall update process and the specific technical route of multi-scale spatial data's joint updating are designed.The key technologies of joint updating are discussed from the aspects of geographic entity coding,geographic entity matching and geographic entity database.4)On the basis of the above research,take the basic scale DLG data of DeQing county in Zhejiang province for example,the method of multi-scale geographic entities matching and multi-scale spatial data's joint updating mechanism is tested and evaluated.