This doctoral dissertation thoroughly analyzes the possibility of establishing a 3D real estate cadastre by utilizing the resources of remote sensing. A common examination of two fields was conducted, namely land administration and remote sensing. The research revealed that the establishment of a 3D cadastre is necessary for the complete and quality registration of rights, restrictions and responsibilities in regard to real estate and other data. Land parcel as the basic unit of the parcel cadastre is not suitable for the complete and transparent registration of rights, restrictions and responsibilities. Also, it does not offer data support for other purposes of land administration, such as real estate evaluation, support for property management and spatial planning. The basic unit of the proposed 3D cadastral model is a 3D real estate unit, referring to a real property which is spatially limited in terms of position as well as in terms of height. For purposes of establishing a 3D cadastre an analysis of suitability of selected remote sensing Technologies was performed. It has been noted that, given the high requirements for accurate position determination of registering boundary markers, only unmanned aerial systems are appropriate. For the registration of building roofs and traffic routes, the use of stereopairs of aerial photographs and airborne laser scanning is recommended. Theoretical results were tested in practice. Unmanned aerial systems were proved to be appropriate for the registration of boundary markers, as these systems provided a highly accurate position that is comparable to the classic terrestrial measurement. It has been established that the photogrammetric point cloud of airborne laser scanning of Slovenia with a resolution of 5 points/m2 is sufficient for the registration of characteristic roof points and traffic routes. In addition to remote sensing data, the information about the spatial dimensions of parts of buildings and the spatial dimensions of buildings and other construction-engineering structures above and below the surface of the Earth that cannot be obtained by the airborne remote sensing technologies is particularly crucial for the establishment of a 3D cadastre. The findings were summarized in examining the possibilities of establishing a 3D cadastre in Slovenia in terms of upgrading the existing system. In case of a building a 3D model of a building was made, including cadastral data such as floor plans and building cross sections. The additional data needed are the roof shape (this can be obtained by remote sensing technologies) and the floor or room height (this is the only information that should be additionally obtained on the basis of field examination of the area). The existing legislation enables a 3D building registration. However, traffic routes and other construction-engineering objects that are not considered a land parcel or a building cannot yet be registered in Slovenia. Therefore, an introduction of a 3D real estate unit was proposed to enable the registration of other above-ground and underground 3D objects. Significant further challenges are related to the detailed definition of cadastral data models, the introduction of a temporal component in the data model of real estate cadastre and detailed definition of procedures ("events") of changing and maintaining data of real estate cadastre, while taking into account also the spatial and legal aspects of space structuring, in addition to the perspective of data registration.