Multi-granularity Spatio-Temporal Object Generation Technology Based On Vector Map

With the advent of Pan-spatial Information System(PSIS)and multi-granularity spatiotemporal object model.Vector map as one of the main content of existing geospatial data,the technology of generating spatio-temporal objects of multi-granularity from vector map data is one of hotspots and difficult point on data sources research in PSIS,this study has important and practical significance for the application and functional design of PSIS.Based on spatiotemporal object data model,the data organization model and description characteristics has been analyzed in this paper,and problems related to generating spatio-temporal objects of multi-granularity from vector map data has been studied from a perspective of “theorytechnical route-experimental confirmation”.The main contents are as follows:(1)The main research and key problems of generating spatio-temporal objects from vector map data has been analyzed in aspects of both theoretical and technological,and proposed the main problems that need to be solved for generating multi-granularity space-time objects from vector map data.(2)The formalized description of spatio-temporal object of multi-granularity has been designed,and the notion of object automation generation based on spatio-temporal object class has been explained.Then,automatic generation technology framework and transformation process of spatio-temporal objects of multi-granularity have been designed.Afterwards,generation process of spatio-temporal object of multi-granularity based on vector map data has been designed in detail and critical technologies which need to address have been analyzed.(3)The main characteristics of spatio-temporal template of multi-granularity is discussed,the formalized description has been designed,as well as composition structure of object template and object template files.Then,the storage form of object template database has been designed.Finally,based on the above research,the function module of template generation process and template building tool has been designed.(4)Firstly,we analyze the characteristics of data transformation rules and the construction principles of transformation rules based on the object template.Secondly,transformation rules of vector map are classified.Then,according to the information composition of vector map,the transformation rules are designed in detail.Finally,the automatic transformation process based on templates and transformation rules has been designed.(5)Prototyping tool that can generate spatio-temporal objects of multi-granularity from vector map data has been designed and implemented,which have realized the complete process from creation of vector map data transformation rules to generation of spatio-temporal objects of multi-granularity.Finally,the correctness and the technical route in this paper are verified by spatio-temporal object modeling tool of multi-granularity.