Practical Approaches to 3D Cadastre Implementation: Database Schemas and Exchange Formats
Javad Shahidinejad, Mohsen Kalantari, Abbas Rajabifard
Land administration systems in Victoria currently use 2D cadastral databases to record, manage, and retrieve data, facing various challenges. These databases have been fundamental to land administration for over two decades, primarily focusing on 2D data to manage property rights, restrictions, and responsibilities (RRRs). Despite some progress, a comprehensive database schema for 3D cadastres is still lacking. Developing such a schema involves multiple steps, including creating a conceptual design, selecting a database management system, developing the logical design, and implementing the physical design.
This paper focuses on developing a database and exchange formats at the schema level based on Land Administration Domain Model (LADM) Edition II, aligned with the Victorian cadastral system. The Victorian cadastre is the result of collaborative efforts from various agencies, departments, and projects. Key components like Vicmap, Victorian Online Title System (VOTS), Surveying and Planning through Electronic Applications and Referrals (SPEAR), and ePlan are integral to the system, each corresponding to different parts of LADM II. The current 2D cadastral system in Victoria is based on an XML format, while the Intergovernmental Committee on Surveying and Mapping (ICSM) is working on developing a 3D Cadastral Survey Data Model (3D CSDM) for Australia, which is based on a JSON format. In this paper, we investigate the Victorian cadastral system and different parts of LADM Edition II and identify the similarities between them. An integrated conceptual data model for Parts 1, 2, and 5 will then be created. Since each part of LADM II is a standalone standard, there are redundancy and consistency issues that need to be addressed.
Furthermore, the challenges of transforming the conceptual data model into logical and physical data models will be discussed, and solutions to address these challenges will be analysed. The paper underscores the importance of adhering to database design principles for managing 3D spatial data within relational databases like PostgreSQL/PostGIS, highlighting the necessity of manual interventions during the transformation process. It also examines the creation of exchange formats such as XML and JSON and compares them with databases. The paper emphasises the need for a consistent approach to ensure data integrity, compatibility, and the linking of concepts to maintain consistency and interoperability.
Event: 12th International FIG Workshop on LADM & 3D LA
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