Application Of Mobile Laser Scanning Data In 3D Cadastre Modeling

Traditionally, the cadastre is 2D based. The growing population and the consumption of land have caused an increasing pressure of land use. The limited land resources drive people to exploit the space that above and below the earth surface, and have caused the 3D property situation such as the overlapping building complex, interlocking constructions and the underground facilities. This tendency dramatically changed the relation between human and land, leading to a growing importance of land ownership. It has been approved that the 2D based cadastral activities are not applicable for the complex situation. Therefore, the 3D cadastre, which extended the cadastral registration to the third dimension, becomes to be a necessity.From the 3D cadastre registration perspective, the term 3D property refers to the bounded amount of legal space which is required by physical objects. The building complex and the apartment are the main properties in cadastral system with 3D characteristics, the exterior structure such as the overhanging eaves and balconies extent out of the footprint of the building, their existence affects the legal space or the occupied space of the object in three dimensions. Therefore, for each building property, how clearly reconstruct its physical structure and then to represent the legal space correctly is the premise of a precise 3D building registration.Along with the rapid development of the 3D data acquisition and reconstruction techniques, now it is possible to model the building objects with detailed geometric information into a 3D form. In this research, the Mobile Laser Scanning (MLS) data is implemented for the building objects reconstruction. The suitability of applying the MLS products in 3D cadastre for physical building and apartment units modelling is assessed. Besides exploring the 3D objet acquisition and modelling, this research also discusses the concept of"legal space registration & physical structure representation". An external PhysicalBuilding package which aims to integrate the physical building model into 3D cadastre data set for legal space registration has been developed in this study. Within the procedure of the physical building modelling by using the MLS data, the building units that cadastre interests including the whole building objects, the storeys and the apartment units were reconstructed. The experimental results of the building unit model and the accuracy assessment show the feasibility of introducing the MLS data for 3D cadastre modeling and registration.The main contribution of this work are as following:a) Proposed a"Surveying and Representation_ PhysicalBuilding"package for 3D building unit modeling and representation on the framework of ISO/TC 211 Geographic information - Land Administration Domain Model (LADM). This package outlines the concept of"legal space registration & physical structure representation". By associating with the"LA_LegalSpaceBuildingUnit", the spatial and geometric information of the physical building model can be accessed by the cadastre dataset and used as references to support the property registration work.b) Designed a workflow and scheme of reconstructing the 3D building objects by using MLS data and the relevant cadastral records for the proposed LADM package. The experimental results show that the applicability of introducing the MLS data for 3D a physical building model in 3D cadastre.