Bridging the Gap between LADM and Cadastres

The LADM passed, on the 1st of November 2012, the final vote towards becoming an international standard, ISO 19152, and was formally published by ISO on 1ste of December 2012. Since then there has been a considerable move in the land administration domain towards the implementation of the model. Examples are in Australia, China, Malaysia, Indonesia, South Africa and some other countries. Most of these implementations are limited to research and development in academia. We can also observe that some of the land administration agencies are considering the adoption of the standard in various initiatives. The above mentioned implementations often ignore that LADM is a reference model that only provides an abstract and conceptual schema for spatial and non-spatial land administration data elements. Theses implementation tends to derive a database from the conceptual model ignoring the decisive step of logical modelling. LADM describes the entire land administration domain. However, for implementation of it in a land administration system, a logical data model is needed. The logical model describes data requirements of the subject land administration system. The logical model puts terminology described in the conceptual model, LADM, into perspective for a given land administration system. More importantly, the logical modelling enables the land administration systems to assess how and to what extent LADM fits with their organisation requirements. This paper presents two case studies in Australia and Belize where a LADM based logical model is developed, and data requirements, for a part of the cadastre in these jurisdictions, are modelled. In this process, we examine data correlation between LADM and the case studies. The paper then takes the evaluation into another level by comparing the case studies against an implementation of the LADM based logical model in an ArcGIS geodatabase