In recent times, civil and architecture engineering are more inclined towards 3D technology. 2D cadastral maps are unable to provide efficient land information. For example, building and basement facilities require 3D space registration, but it is impossible to represent 3D space on the 2D cadastral maps.
To solve this problem, the National Assembly of the Republic of Korea had passed a special law of cadastral resurvey in 2011 and the government had enacted enforcement decree of the special law in cadasral resurvey in 2012.
3D Cadastre Resurvey project in Republic of Korea
Through 3D Cadastre Resurvey project, the land administration department offers 3D cadastral maps, preserves property rights and increases utilisation of land information service. For this project, the gorvernment developed a data model and a 3D cadastral prototype system. They developed a 3D model, which covered eight different areas.
The 3D cadastre prototype system offers several benefits. For instance, it properly displays 3D cadastre DB, answers inquiries regarding basement space or 3D cadastral records, looks for the history of condominium leasehold registration and so on. To meet these purposes, the Korean government accepted full 3D display method for effective expression of 3D cadastre. The prototype system of pilot project is shown in figures 1, 2, 3 and 4.
Figure 1. Screen shot of prototype system(basement of a shopping mall)
Figure 2. Basement of a shopping mall
Figure 3. Topographic(left) and cadastral(right) map
Figure 4. 3D models of basement shopping mall
Impacts of 3D cadastre project
Through the 3D Cadastre Resurvey project, the Ministry could ask a part of the land administration department to serve 3D cadastral maps, preserve property rights and increase utilisation of land information service. The Korean government has a policy on 3D NSDI which promotes spatial information industry to establish a base for the future growth.
The introduction of 3D cadastre is needed at this point not only for the management of public facilities but also for the preservation of individuals” property ownership. Thus, in this project, the Korean government suggested systemic improvement for preparing basis of introduction; the future plan has already been prepared for a stable settlement of 3D cadastre. In addition, the government has granted eight pilot projects. These project sites have difficulties with using current 2D cadastre for management and immediate register.
3D cadastre has been continuously studied in the international academic field. Yet, the importance of 3D cadastre is not known well in Korea because it is not supported by a legal or systemic organisation.