Abstract
The cadastral system provides land ownership information by registering and representing land boundaries on a map. The current cadastral system in Korea, however, focuses mainly on the management of 2D land-surface boundaries. It is not yet possible to provide efficient or reliable land administration, as this 2D system cannot support or manage land information on 3D properties (including architectures and civil infrastructures) for both above-ground and underground facilities. A geometrical model of the 3D parcel, therefore, is required for registration of 3D properties. This paper, considering the role of the cadastral system, proposes a framework for a 3D underground cadastral system that can register various types of 3D underground properties using indoor mapping for as-built Building Information Modeling (BIM). The implementation consists of four phases: (1) geometric modeling of a real underground infrastructure using terrestrial laser scanning data; (2) implementation of as-built BIM based on geometric modeling results; (3) accuracy assessment for created as-built BIM using reference points acquired by total station; and (4) creation of three types of 3D underground cadastral map to represent underground properties. The experimental results, based on indoor mapping for as-built BIM, show that the proposed framework for a 3D underground cadastral system is able to register the rights, responsibilities, and restrictions corresponding to the 3D underground properties. In this way, clearly identifying the underground physical situation enables more reliable and effective decision-making in all aspects of the national land administration system.
Highlights
The International Federation of Surveyors (FIG) defines a cadaster as follows: it “is normally a parcel based and up-to-date land information system containing a record of interests in land
This paper proposes three types of cadastral maps: (1) isometric view of 3D underground cadastral map; (2) 2D surface parcel with footprints of 3D underground cadastral map; (3) 3D surface and 3D underground cadastral maps, based on as-built Building Information Modeling (BIM)
In order to fulfill its intended function, the 3D underground cadastral system requires effective and efficient indoor mapping technology; the authors chose a terrestrial laser scanner for relevant indoor mapping, which utility has been extensively employed in the as-built BIM arena
Summary
The International Federation of Surveyors (FIG) defines a cadaster as follows: it “is normally a parcel based and up-to-date land information system containing a record of interests in land. Due to population growth and shortage of available land, especially in urban areas, property development has been conducted extensively through both above-ground and underground spaces This has incurred a variety of problems related to the registration and management of 3D properties based on a 2D cadastral system [2]. Registration of 3D property rights has become an important issue in the cadastral domain, because it is a fundamental function for protection of ownership, property tax assessment, land use, and land management systems [3,4,5]. As such, it is used directly by land registries, certified public appraisers, real estate agents, city planners, and landowners. 3D cadastral system research and development continue to be critical land management issues, and Korea is no exception in this regard
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