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  • Employing existing standard BIM formats as the source of building information in Indoor Positioning : dissertation for acquiring the title Doctor technicae
    Muhič, Sergej
    The rapid urbanization of the worldʼs population is the main reason that everyday life is increasingly taking place in buildings. Therefore, the need for a robust indoor positioning system is ... becoming apparent. Notably, for first responders the current position in field operations is of critical importance; as well as for the blind and visually impaired the orientation in a complex environment. Worldwide the issue has become the priority of many research projects, and the solution is being addressed using various technologies. In the scope of the research projects CADMS and the subsequent AIONAV from the Graz University of Technology Institute of Building Informatics under the leadership of Prof. Ulrich Walder, the first steps towards real life implementation were taken. An autonomous system based on inertial technology was developed and tested. However, the system-induced drift can be addressed only to a certain extent with an extended Kalman filter. Therefore, additional methods of position correction are required and a building model interaction was developed. This method from the CADMS project has provided the main incentive for our research into exploiting existing sources of building information for this purpose. The underlying indoor positioning building model format (IPS XML) developed for CADMS also serves as the reference for basic requirements and as the destination format for building data extraction from building information systems like CAD, BIM or CAFM. Other research projects that take advantage of Indoor Positioning have been analysed, and the demand for a common source for building data would be beneficial, since even now they rely predominantly on the manual generation of building models. Therefore, several modern file format standards that store building information for different purposes were evaluated and compared. As an example of two different approaches, the already established file formats of a native application specific file format from the Autodesk building modelling application Revit (RVT format) and the international standard IFC, were chosen as the most suitable. These formats represent different types of data storage and The rapid urbanization of the worldʼs population is the main reason that everyday life is increasingly taking place in buildings. Therefore, the need for a robust indoor positioning system is becoming apparent. Notably, for first responders the current position in field operations is of critical importance; as well as for the blind and visually impaired the orientation in a complex environment. Worldwide the issue has become the priority of many research projects, and the solution is being addressed using various technologies. In the scope of the research projects CADMS and the subsequent AIONAV from the Graz University of Technology Institute of Building Informatics under the leadership of Prof. Ulrich Walder, the first steps towards real life implementation were taken. An autonomous system based on inertial technology was developed and tested. However, the system-induced drift can be addressed only to a certain extent with an extended Kalman filter. Therefore, additional methods of position correction are required and a building model interaction was developed. This method from the CADMS project has provided the main incentive for our research into exploiting existing sources of building information for this purpose. The underlying indoor positioning building model format (IPS XML) developed for CADMS also serves as the reference for basic requirements and as the destination format for building data extraction from building information systems like CAD, BIM or CAFM. Other research projects that take advantage of Indoor Positioning have been analysed, and the demand for a common source for building data would be beneficial, since even now they rely predominantly on the manual generation of building models. Therefore, several modern file format standards that store building information for different purposes were evaluated and compared. As an example of two different approaches, the already established file formats of a native application specific file format from the Autodesk building modelling application Revit (RVT format) and the international standard IFC, were chosen as the most suitable. These formats represent different types of data storage and availability. Whereas the RVT format is a closed format accessible through an API, the IFC format is an open ASCII format file.. Whereas the RVT format is a closed format accessible through an API, the IFC format is an open ASCII format file. Both of the aforementioned formats have proven suitable. We managed to extract building data and create the building information required for IPS XML from each of them with a novel algorithm that creates topological information from the geometric and semantic data provided by the building models. The fact the IFC is an open format as well as its availability and flexibility may lead to the general acceptance of the format as the main source of building data for IPS. The further study of IFC has also offered a possible final solution for a common IPS format through the exploitation of model view definitions.
    Type of material - dissertation
    Publication and manufacture - Graz : [S. Muhič] : [Technische Universität Graz], 2015
    Language - english
    COBISS.SI-ID - 19512342

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