Study On GIS-T Spatial Database Management And Applycation

Transportation is an important field of GIS application. Due to its spatial and applicable characteristics, GIS application in transportation is specially termed as GIS-T, Geographical Information System for Transportation. This dissertation studies systematically the key technology of GIS-T spatial database management and application, based on two projects. The first project is"ITS-oriented Transportation Planning and Transportation Analysis Software Development", a part of the"Tenth Five-Year Plan"National Key Project of"A Study on Key Technology in Intelligent Transportation System,"and the second one is"A Study on Highway Transportation Information, Basic Geography Information Spatial Database Management and their Application Technology.With a focus on the theories and techniques related to GIS-T spatial database management and application, the dissertation consists of five parts: 1) transportation system and its informationalization; 2) theory of spatial database management and data models; 3) transportation feature-oriented multidimensional spatio-temporal data model—TFODM; 4) GIS-T Spatial database application technology, and 5) application software techniques and development. The first two parts serve as the bases for research, while the third and fourth parts are the core of research, and the fifth part is the application software techniques and development. The study is complete in theory and application, with GIS-T spatial database managementPart I analyzes the basis of transportation system informationalization, including the basic theories, classification and characteristics of transportation information. It further studies the advanced technology of transportation information application and management, GIS features and basic functions and application of GIS-T in the field of transportation.Part II deals with GIS-T-related theory, technology and method, which consists of the development of general database techniques, data model and data schema, spatial database principles, spatial data model, type and operation by making a full analysis and summary of spatial database model, feature oriented GIS modeling method, spatial data types, basic spatial data relations as well as operation of spatial data.As one of the two central parts of the research, Part III gives a detailed account of GIS-T linear data processing techniques and a summary of the transportation linear data model. It proposes that the current linear model can be divided into the first, second and third levels of abstract spatial models according to the measure, sequence and direction described in the linear model and topological spatial relationship. After the analysis and account of the GIS-T data model and its advantages and disadvantages, it holds that the current GIS-T data model is mainly static planar construct, whereas 3D spatial-temporal GIS-Ts are gradually in focus. Therefore, the dissertation proposes the TFODM, the transportation feature oriented data model, describes completely the conceptual and the logic models of TFODM, and analyses the multi spatial and temporal data model based on relation level, tuple level and attribute level. It also describes the general temporal attribute of transportation feature, spatial temporal location and topological spatialrelationship. Furthermore, it raises the TFODM temporal data model as well as the transportation feature oriented spatial-temporal data models of multi base state with amendments.Part IV is another central part of the dissertation, which focuses on the application technology of the TFODM GIS-T data model. Firstly, it studies the LRS-based and SRS-based value conversion, with the proposal of the method from LRS to SRS. It further investigates the automatic generating techniques of spatial-temporal topological multi-level network and network path algorithm on the basis of the proposed TFODM network data processing techniques, and establishes the network feature based and object-oriented spatial network data construct according to the characteristics of TFODM spatial network, and analyzes spatial inference network hierarchical method. Moreover, the spatial tile-based and hierarchical shortest path algorithm is scrutinized and the complex node-based hierarchical network path algorithm is developed.Part V describes the main functions of the two sub-systems of the GIS-based transportation planning and analyzing software system developed by the author: transportation spatial network database input and control system, and transportation network analyzing and predicting visualization and output system. It creates a spatial network generating and network processing technique applicable to transportation network analysis software and a TFODM physical data model and data structure to be applied in the development of TranStar network software.