Theory & Methods Of Three-Dimensional Cadastral Model

Cadastral management is an important means to protect the legitimate use of land, the interests of land owners and users. It can maintain order of social. It plays an important role in the social management and economic activities. Today, the digital cadastral can use digital surveying technique and modern management in the whole. These modern techniques expand the traditional cadastral management methods. However, it is still based on two-dimensional Cadastral Spatial Database. With the rapid development of use of city space, this cadastral management method can not show the utilization of the 3D Cadastral directly. So, we present a new three-dimensional cadastral management method combined with 3D spatial information technology and cadastral management. This paper focuses on 3D cadastral data model, data integration management, spatial indexing and spatial relations. The major works implemented are presented as follows:(1) This paper reviews and sums up the basic characteristics of cadastre management in detail. We also analyze and summary the limitations of the traditional two-dimensional model of cadastral management. Moreover, we sum up the characteristics of three-dimensional cadastre and discuss the direction of the research of 3D cadastre.(2) This paper analyses the data requirements and model structure between two-dimensional cadastral data model and three-dimensional cadastral data model in detail. Combined with the data model of three-dimensional Geographic Information System, we study the basic entities types of 3D cadastral and characteristics of three-dimensional cadastral data model systematically. In the paper, we extend the 3D object-oriented data model and present a new three-dimensional data model for cadastral (CO3D). Moreover, we explain the basic concepts and data structure, analysis the data storage of it by example.(3) In order to utilize the traditional two-dimensional cadastral data fully, this paper introduces an integrated model to manage the two-dimensional and three-dimensional cadastre cadastral data. This model can show the basic spatial characteristics and relationship between two-dimensional cadastre with three-dimensional cadastre effectively.It can reduce the difficulty in establishing three-dimensional cadastre system, and it can also help to keep the management of cadastral continued. This paper classified the new model and put forward a basic framework to convert the two-dimensional cadastre data to three-dimensional cadastre data. We also describe the data conversion algorithm which is verified by actual examples.(4) In order to improve the spatial data query and retrieval efficiency of the 3D cadastral, this paper present the three-dimensional spatial index method based on road network cadastre. This method can remove the fault of grid-based spatial index method. We describe creation and maintenance process of the spatial index in detail.(5) In order to express the spatial relationships of three-dimensional cadastral, this paper put forward explicit expression of spatial topological relations and storage model for 3D cadastral. We discuss the mapping strategy from topological spatial relations to structured query language in the query process and proved it truly through practical examples.(6) In order to validate our research results in the 3D cadastral, this paper develop a 3D cadastral data management system. This paper show development environment and architecture in details, and presents the results of the experimental system.