LADM-based Crowdsourced 3D Cadastral Surveying – Potential and Perspectives

LADM-based Crowdsourced 3D Cadastral Surveying – Potential and Perspectives

Gkeli, Maria
Potsiou, Chryssy
Ioannidis, Charalabos

2018-10-02

The rapid economic and social transformation over the last several years, has led to multiple rearrangements regarding the land administration procedures. Vertically growing cities, complex infrastructure, subdivision of three-dimensional (3D) space through several uses and overlapping property rights have increased the demand for establishing modern land administration systems, able to manage various types of rights in a uniform, standardized and reliable way, both above and below the land surface. Since 2012, the Land Administration Domain Model (LADM ISO 19152) constitutes the international standard for cadastral data modelling. Although LADM offers several representations for 2D and 3D cadastral data the definition of the acceptable 3D cadastral object representations and the corresponding 3D geometries are still under investigation. In recent years, many countries have developed legal procedures and prototype systems for the registration of rights on 3D property units, resulting in interesting approaches concerning the acquisition and visualization of such data. However, these approaches are in high demand in terms of required time and cost. In the meantime, significant progress has been achieved in developing 2D cadastral surveying procedures to minimize time and cost, utilizing modern techniques and technological achievements. In this paper an innovative cost-effective technical framework is designed and proposed, in order to provide a modern technical solution for the initial acquisition, registration and representation of 3D cadastral data, based on international standardization (LADM). The architecture of the proposed technical framework consists of two connected complementary parts: the server-side and the client-side. The first refers to the webserver and therefore to the Database Management System (DBMS). The second refers to the communication between the server and the data capturing tool. For the server-side, a prototype system based on model driven architecture practices and LADM is developed. For the client-side an open-sourced self-developed mobile application for the acquisition of 3D crowdsourced cadastral data, 3D modelling and visualization of the 3D property units, as block models (LoD1) on a mobile’s phone screen at real-time, is developed. The scope of this study is focused on investigating technical aspects of integrating legal and physical objects as well as assessing the quality of the produced geometric results in terms of accuracy and reliability. A detailed study of legal issues is outside the objective of this research. The proposed crowdsourced framework is tested for a multi-storey building in an urban area of Athens, Greece. The main conclusions refer to the usability, the perspectives and the reliability of crowdsourced data in designing an affordable and functional procedure for an initial implementation of a fit-for-purpose 3D cadastre.

Data Capture
3D Cadastre
LADM
Crowdsourcing
3D Modelling
Visualization
3D Spatial Data

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