Integrated management of indoor and outdoor utilities by utilizing BIM and 3DGIS

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Title: Integrated management of indoor and outdoor utilities by utilizing BIM and 3DGIS
Authors: Hijazi, Ihab
Thesis advisor: Prof. Dr. Manfred Ehlers
Thesis referee: Prof. Dr. Sisi Zlatanova
Abstract: Computer Aided Design (CAD) and Geographic Information System (GIS) are two technologies/systems that are used in tandem in different phases of a civil infrastructure project. CAD systems provide tools to design and manage the interior space of buildings, while GIS is used to provide information about the geo-context. These two technologies encroach upon each other's territory. In fact, the business processes related to them do not even have these boundaries. Utilities infrastructure is an area wherein integrated information management, facilitated by input from both systems, is crucial. This research provides a framework and a data model, "Network for Interior Building Utilities" (NIBU), for integrated analysis and management of interior building utilities in a micro-scale environment. The framework considers managing individual network systems by providing semantic categorization of utilities, as well as a graph structure based on a "Modern" adjacency list data structure. The framework also considers managing the interdependencies between different network systems and the building structure. NIBU is a graph-based spatial data model can be used, in providing the location and specifications of interior utilities to a technician, to perform a maintenance operation, or to estimate the effect of different maintenance operations in different locations along utility service systems. The model focuses on two important aspects: 1) the relationship between interior utilities and building elements (or spaces) and 2) the building hierarchy structure to which the utilities network is related. A proper hierarchy of the building that supports the generation of human-oriented descriptions of interior utilities is also developed during the research. In addition, a method for partitioning of large building elements (and spaces) was utilized. The connection of the different utilities network systems and buildings were established using joints, based on a containment relationship. A user requirement study consisting of three use case scenarios ("maintenance operation", "emergency response" and "inspection operation") was conducted during the research, and these use cases were used to develop the required functionalities and to test the proposed framework. The framework relies on standards data models related to Building Information Model BIM/CAD and GIS, and these standard models were used as data sources for obtaining information about the utilities. BIMs support the semantic and geometric representation of interior building utilities, and, more recently, City Geographic Markup Language (CityGML) has been extended to model utilities infrastructure. Semantic harmonization was employed to achieve the integration and provide a formal mapping between the BIM i.e. Industry Foundation Class (IFC), CityGML and NIBU. The semantic and connectivity information from these (BIM/ GIS) standards were mapped onto NIBU. Furthermore, the building structure and the required hierarchy were obtained from these models. The research proves that BIMs provide the required amount of information that is needed for the framework and model (i.e. NIBU). By contrast, CityGML does not provide the amount of detail required by NIBU. The research also provides an information system that facilitates the use of BIM for geo-analysis purposes, by populating/implementing the NIBU and its functions. BIM4GeoA is a concept for combining existing Open Source Software (OSS) and Open Specification (OS) for efficient data management and analysis of building information within its broader context. The core components of the system are the Spatial Database (i.e. PostgreSQL/PostGIS), the Building Information Model Server, a Virtual Globe application (i.e. Google Earth 3D viewer), and the models of existing BIM/3D Open Geospatial Consortium (OGC) standards (IFC, Keyhole Markup Language (KML), CityGML). Following the system development, a thorough analysis of the strengths and weaknesses of these different components were completed to reinforce their strengths and eliminate their weaknesses. The system is used in implementing the NIBU model and its functions; i.e. NIBU is mapped to PostgreSQL/PostGIS spatial Data Base Management System (DBMS). The model is populated directly from a BIM Server with the help of an IFC parser developed during the research. Five analysis functions are implemented in the system to support spatial operations. These were: trace upstream, trace downstream, find ancestors, find source, and find disconnected. The investigation proves that NIBU provides the semantics and attributes, the connectivity information and the required relationship necessary to facilitating analysis of interior utility networks and manage its relations with building structures.
Subject Keywords: CityGML; BIM; Graph; City models
Issue Date: 9-Jan-2012
Type of publication: Dissertation oder Habilitation [doctoralThesis]
Appears in Collections:FB06 - E-Dissertationen

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