The main purpose of this workshop will be to open international discussion on 3D Cadastres and exchange the status, experience and (planned) developments on use of 3D cadastral registrations. It will be a useful workshop aiming to exchange ideas, experiences and knowledge, concerning both technical and legal aspects of a 3D Cadastre. The subjects that the workshop will focus on are: 1 - the legal status of 3D objects, limitations, etc. 2 - conditions for establishment, including relations to neighbouring properties, etc. 3 - the registration of 3D objects, both the legal status and the geometry 4 - practical aspects, considerations and solutions for the establishment of a 3D Cadastre