The Land Administration Domain Model Standard

LADM is a international standard for the land administration domain. It will stimulate the development of software applications and will accelerate the implementation of proper land administration systems that will support sustainable development. The LADM covers basic information-related components of land administration (including those over water and land, and elements above and below the surface of the earth); The standard provides an abstract, conceptual model with three packages related to: - parties (people and organizations); - basic administrative units, rights, responsibilities, and restrictions (ownership rights); - spatial units (parcels, and the legal space of buildings and utility networks); with sub packages for spatial sources (surveying), and spatial representations (geometry and topology). This paper summarizes the motivation, requirements and goals for developing LADM. Further, the standard itself is described, including the development process and potential future maintenance. Despite being a very young standard, ‘born’ on 1 December 2012, it is already possible to observe some of the impact of LADM and some examples of this are given in the paper

Topographic Signs - Important Context for a 3D Cadastre

Utilities, buildings and infrastructure digital representations are very important set of spatial data for quality and sustainable spatial management and development of community in general. Many countries are on the way of the establishment of the 3D cadastre. Existing 2D cadastral systems are able to make gradual transition to 3D cadastre, but for the implementation of real 3D cadastre in many countries it is necessary to change the regulations. A topographic sign or topographic symbol is representation of a topographic object on map. In combination with other geodetic and cartographic products we can get to very useful information, often quite relevant in order to provide reference context for a 3D cadastre. Topographic signs on topographic maps and on other geodetic products give a representation of complex real-world situations that are not usually drawn in the cadastral maps. The real world, physical, objects as included on topographic maps, prove the context/ reference for the legal spaces. This is true for both the 2D, but perhaps even more for the 3D case. Performing an overlay, if needed after proper orientation, it is easy to combine geodetic and cartographic products in today’s digital environment. Special attention is needed for the tunnels, overpasses, underpasses, bridges and other objects to be registered in 3D cadastre because their 2D cadastral description does not meet the needs of modern society. In case of 3D topographic data (e.g. 3D CityGML model), then it would also well possible to implement this into 3D cadastre and combine 3D legal spaces with the 3D real world items from the 3D topographical model. However, this combination/integration is usually not feasible with the cadastral plans (survey plans, field sketches) as those are not draws to scale (in both 2D and 3D)

Towards a New Working Item Proposal for Edition II of LADM

This paper presents the first and incomplete draft text for the revision of IS 19152:2012 ‘Geographic information — Land Administration Domain Model (LADM)’ within ISO TC211 in the form of a New Working Item Proposal (NWIP). This ‘two-page NWIP’ text aims to describe the scope of proposed project to revise, and also provides the purpose and justification behind this revision of LADM. The International Federation of Surveyors (FIG) also submitted to ISO the NWIP for the current version of LADM (IS 19152:2012). As for the revision the ambition is now to go beyond just a conceptual model by providing steps towards implementations (e.g. more specific profiles, technical model in various encodings, etc.), it is the intention that the Open Geospatial Consortium, Inc. (OGC) is heavily involved in the revision and that the result is a joint ISO/OGC standard. For this purpose the recent draft OGC White Paper is added as Appendix 1 to this paper to provide more detail background information. It is further noted that the complete NWIP for Edition II of LADM also ‘Preparatory work’ should be attached; e.g. a draft of the new version of the standard. In the case of the revised LADM standard of course this is based on the IS 19152:2012, but will contain also contain collected materials from the LADM2017 and LADM2018 workshop

Topographic Signs - Important Context for a 3D Cadastre

Utilities, buildings and infrastructure digital representations are very important set of spatial data for quality and sustainable spatial management and development of community in general. Many countries are on the way of the establishment of the 3D cadastre. Existing 2D cadastral systems are able to make gradual transition to 3D cadastre, but for the implementation of real 3D cadastre in many countries it is necessary to change the regulations. A topographic sign or topographic symbol is representation of a topographic object on map. In combination with other geodetic and cartographic products we can get to very useful information, often quite relevant in order to provide reference context for a 3D cadastre. Topographic signs on topographic maps and on other geodetic products give a representation of complex real-world situations that are not usually drawn in the cadastral maps. The real world, physical, objects as included on topographic maps, prove the context/ reference for the legal spaces. This is true for both the 2D, but perhaps even more for the 3D case. Performing an overlay, if needed after proper orientation, it is easy to combine geodetic and cartographic products in today’s digital environment. Special attention is needed for the tunnels, overpasses, underpasses, bridges and other objects to be registered in 3D cadastre because their 2D cadastral description does not meet the needs of modern society. In case of 3D topographic data (e.g. 3D CityGML model), then it would also well possible to implement this into 3D cadastre and combine 3D legal spaces with the 3D real world items from the 3D topographical model. However, this combination/integration is usually not feasible with the cadastral plans (survey plans, field sketches) as those are not draws to scale (in both 2D and 3D)

Systematic Analysis of Functionalities for the Israeli 3D Cadastre

Following public demand to improve the efficiency and transparency of government administrations, together with the existence of mature technologies and modern urban planning necessities, it is now essential to establish more advanced and comprehensive land management (cadastre) systems. Cadastre systems available today are mostly based on twodimensional registration procedures only, limited in their ability to manage modern urban and complex areas. This requires the ability to handle various types of data in a uniform way - both spatially (horizontal position and altitude) and temporary, with emphasis on infrastructure development that must be addressed and registered with respect to the third dimension – above-terrain and below-terrain. That is, establishing a series of conditions and functionalities, which will enable utilization of land/space for various complex projects, individually owned, above and below the surface. The Survey Of Israel (SOI) is advocating towards a solution related to 3D cadastre, establishing the idea of a unified spatial 3D volumetric parcel, such that the volume of such new 3D spatial parcel can be a part of (subtracted from) a number of 2D parcels. The required 3D Cadastre system should be capable to combine different types of data that are relevant to cadastre systems, and to constitute a unified model from different government databases: among others, the Survey Of Israel, the Land Registry, and the Israel Land Authority. The system should enable archiving, visualization, queries and analysis of three-dimensional characteristics and structures on different temporal time-stamps. So far, three-dimensional systems are currently having their focus on 3D topography (modelling physical real-world objects), and are limited in supporting the multi-dimensional cadastre implementation needs. This study aims at investigating and presenting a set of spatial functionality requirements from such a system that would enable good governance in accordance with the definitions and guidelines of the SOI, derived mainly from technical specification required to support the third dimension (depth/ height) in existing platforms or systems. A systematic analysis of the processes and functionalities needed by such a system is made, each is a workflow of specific geometric and topologic functionalities integrated in the system (such as: intersection, extraction, merging, deletion – to name a few). This study will give an overview of all required functionalities for this system (and relate this to the information needs as expressed in LADM), with detailed description of three processes, and their contribution to the establishment of the 3D cadastre system

BIM Models as Input for 3D Land Administration Systems for Apartment Registration

The growth of cities and the pressure on land worldwide leads to more complex and multilevel structures with different space interrelations. For the registration of complex spaces mostly 2D Land Administration Systems (LAS) are used, while a representation of space in 3D could provide a clearer insight. Concurrently, technological advancements rapidly improve methods to collect, create, visualise, register, store and disseminate 3D data. In this context, much research is now being carried out at the sources and data used as input in 3D LAS and the various methods for their collection. In this scene, the approach to reuse data from the design phase is gaining ground. Specifically existing Building Information Models (BIMs), usually encoded in the non-proprietary Industry Foundation Classes (IFC) format (EN ISO 16739:2018) are considered a promising source for 3D LAS. Previous research has shown promising results using BIMs as input for 3D LAS. However, the use of BIM/IFC-models from practice has not yet been tested adequately. This paper investigates the technical issues that are encountered when using real-world BIM/IFC-models as input for the registration of apartment rights in a 3D LAS and how that process can be improved. In the context of this paper, BIM/IFC-models are iteratively being validating against technical requirements. Five real-world BIM/IFC-models are collected. They are tested on the existence of IfcSpace, geometric validity, overlap and the ability to georeference the BIM/IFC-models. The results of these validation show that the collected BIM/IFC-models lack the ability to be georeferenced. Additionally most BIM/IFC-models did not contain IFCSpace, or reference to essential attributes for identifying legal units in the Dutch 3D LAS. Recommendations and guidelines are formulated to address these issues. The BIM/IFC-models are placed in a 3D LAS at conceptual level, in which the legal spaces are enriched with information of the Rights, Restrictions and Responsibilities (RRR’s) to those spaces in line with the LADM

Modelling 3D underground legal spaces in 3D Land Administration Systems

Two dimensional (2D) Land Administration Systems (LASs) do not adequately represent 3D underground objects. It is not easy to identify the owners of these objects and the relations between objects below and above the surface are not explicitly provided. A 3D LAS can however facilitate a better understanding, as well as a more efficient registration and clear visualisation of the Rights, Restrictions and Responsibilities (RRRs) of the 3D underground objects. To represent 3D underground objects, BIM/IFC (ISO 16739:2018) models can be used from design. The LADM (ISO 19152:2012) standard should be used to provide a formal language to register spatial and non-spatial information in LASs. In this paper a literature review is performed to develop a standardised workflow to model the legal spaces of BIM/IFC models of 3D underground objects according to the LADM in 3D LASs. With this workflow the user is provided with a general framework, where adherence to the BIM/IFC and LADM standards enhances interoperability, increases efficiency and reduces costs. More research needs to be done on validating the workflow with use cases

3D Cadastre and LADM – Needs and Expectations towards LADM Revision

The last decade, significant progress has been made in advancing the concept of 3D Cadastre and related technologies to facilitate its realisation. There are many examples of partial implementation and prototypes of 3D parcels registration around the world as stated by Kitsakis et al (2016) and Dimopoulou et al (2016) regarding selected countries. While standardisation in the land administration domain extends to 3D and even 4D representations, currently, there is no country that has a fully operational 3D Cadastre supporting all stages of the registration and dissemination (Van Oosterom et al, 2014). In the context of 3D Cadastre developments worldwide, the Land Administration Domain Model (LADM), ISO 19152, outlines the foundations for a 3D Cadastre and becomes one of the best candidates for unambiguously representing 3D Rights, Restrictions and Responsibilities (Kalogianni et al, 2017). The spatial development life cycle of an object begins outside the cadastral registration cycle and has a direct impact on how a specific development application is processed. Thus, in considering the changes required to allow a jurisdiction to register 3D objects, it is important to note the sphere of influence that could have an impact on 3D registration. These include multiple stakeholders and processes, which generate different user needs, as addressed at the previous section and also new opportunities that could be addressed on the current LADM version. To this purpose, this paper explores the needs and prospects towards further 3D modelling of the present LADM version, as derived by the current LADM experience in various countries worldwide in the context of the full spatial development cycle. Nevertheless, over the last few years the number of jurisdictions that are developing LADM-based country profiles, prototype systems and undertaking pilots using various physical models and data formats to achieve LADM implementation in the context of 3D Cadastre has become more significant. Those approaches can be mainly categorised as “fully operational” implementations and “partly-operational” implementations focusing on different aspects of 3D cadastre development cycle; e.g. submission of 3D survey plans, prototype stage; implementations that focus on visualisation, implementations that focus on constraints and validation rules, etc. Finally, within this context, this paper examines how current LADM version can efficiently meet the needs stated above and update user requirements for LADM in the context of the upcoming revision

Initial Country Profile of the Kingdom of Saudi Arabia based on LADM

This paper proposes an initial LADM country profile of Saudi Arabia. The model aims to build a better communication system between all the stockholders to secure the land registration. The initial development of the spatial and non-spatial classes are have been based on the regulation of Saudi Arabia. For the development of the LADM profile for Saudi Arabia, several steps have been completed: 1- Interviews have been conducted with the stakeholders to collect information about the regulations of the land/building ownership. 2- Analysis of the current system of the land registration and its requirement for both spatial and non-spatial data has been performed. 3- Local regulations have been utilized to develop the initial LADM country profile