The core cadastral domain model : a tool for development of distributed and interoperable cadastral systems
Oosterom, Peter van & Christiaan Lemmen
A standardized core cadastral domain model (CCDM), covering land registration and cadastre in a broad sense (multipurpose cadastre), will serve at least two important goals: 1. avoid reinventing and re-implementing the same functionality over and over again, but provide a extensible basis for efficient and effective cadastral system development based on a model driven architecture (MDA), and 2. enable involved parties, both within one country and between different countries, to communicate based on the shared ontology implied by the model.The second goals is very important for creating standardized information services in an international context, where land administration domain semantics have to be shared between countries (in order to enable needed translations). This paper presents an overview of the core cadastral domain model. The model has been developed in a set of versions, which were each time adjusted based on the discussions at workshops with international experts and the experience from case studies in several countries of the world (Netherlands, El Salvador, Bolivia, Denmark, Sweden, Portugal, Greece, Australia, Nepal, Egypt, Iceland, and several African and Arab countries). Important conditions during the design of the model were and still are: should cover the common aspects of cadastral registrations all over the world, should be based on the conceptual framework of Cadastre 2014, should follow the international ISO and OGC standards, and at the same time the model should be as simple as possible in order to be useful in practise. The heart of the model is based on the three abstract classes: 1. RegisterObject (including all kinds of immovables and movables), 2. RRR (right, restriction, responsibility), and 3. Person (natural, nonnatural and group). The model supports the temporal aspects of the involved classes and offers several levels of Parcel fuzziness in bothe 2D and 3D space: Parcel (full topology), SpaghettiParcel (only geometry), PointParcel (single point), and TextParcel (no coordinate, just a description). The model is specified in UML class diagrams and it is indicated how this UML model can be converted into and XML schema, which can then be used for actual data exchange in our networked society (interoperability).
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