Topics In the 2014-2018 term of the 3D Cadastres Working Group, there is emphasis on the following 5 new topics: (in addition to the earlier topics, which will also continue to be explored further, see below) Collect and exchange experiences of operational 3D cadastral systems (law, organization, technology) 3D Cadastre in megacities, often in Latin America (Brazil, Mexico), Asia (China, Malaysia, Korea, Singapore) and Africa (Nigeria) 3D Cadastre usability studies, web dissemination and 3D cartography 3D Cadastre as part of the full life cycle in 3D Contribute to the upcoming revision of ISO19152:2017 or 2018 (LADM) by further developing the 3D aspects in this international standard; e.g. provide a more formal taxonomy of different types of 3D parcels (spatial units) 3D Cadastres and models: It is important to realize that for registration, for storage/validation and for dissemination different models (all based on the shared ISO LADM semantics) may be needed and different types of users are involved. The modelling aspect includes the question of which spatial (esp. height) and temporal information should be used and how different types of users may interact (i.e. produce, archive, edit, analyze, and visualize, edit) with 3D Cadastre? The 'users' belong to various categories; they range from professionals (which can be further subdivided in notary, real estate brokers, banks, water boards, utility companies, municipalities, cadastral employees, surveyors, etc.) to citizens (with various capabilities of owners/users: from computer illiterates to experienced websurfers/gamers). 3D Cadastres and SII: The registration of legal objects (cadastral parcels and associated rights) and their physical counterparts (e.g. buildings or tunnels) result into two different, but related data sets, which can be very well accessed together via the Spatial Information Infrastructure (SII, sometimes also called SDI). This is already true in 2D, but even more so in 3D. By also showing some physical objects for reference purpose, the location and size of the legal objects will be clearer. 3D Cadastres and time: A 4D parcel is defined as the spatio-temporal unit against which (one or more) unique and homogeneous rights (e.g. ownership right or land use right), responsibilities or restrictions are associated to the whole entity, as included in a Land Administration system. Homogenous means that the same combination of rights equally apply within the whole 4D spatial temporal unit. Unique means that this is the largest spatio-temporal unit for which this is true. Making the unit any larger (in 3D space or time) would result in the combination of rights not being homogenous. Making the unit smaller (in 3D space or time) would result in at least 2 neighbour 4D parcels with the same combinations of rights. 3D Cadastres and usability: The graphic user interface (GUI) is an essential aspect when realizing 3D Cadastres in practice. This includes investigation of interacting with true 3D cadastral data (specific user interfaces: 3D spatial and perhaps temporal aspects via animations or snapshot sliders). The existing quality of successful and popular user interfaces (such as Google Earth) will be the starting point with specific attention for working with the main 3D legal object types (related to underground infrastructure and building/apartment complexes). A true 3D cadastral system with functions should be implemented and applied to demonstrate the possibilities in practice based on 3D visualization. How to distribute the 3D cadastral information (3D parcels and associated rights) to the citizens? How to represent and demonstrate the 3D geographic aspect, on paper (with different viewpoints) or on electronic media (interactive tools based on Adobe Flex or Flash)?