One of the simplest methods to construct a 3D city model is to extrude building footprints, to obtain “block-shaped” buildings. While the method is well-known and easy to implement, if the topological relationships between the footprints are not taken into account, the resulting city models will not necessarily be topologically consistent. As a result, the model will be of little use for most a...

The OGC OWS testbeds are conducted annually with partners from the industry, research institutes and universities. A Decision Support Scenario (DSS) has been designed for investigating the combination and usage of different OGC standard specification technologies such as a Web Map Service or Web 3D Service inside such a thread. The scenario comprises a emergency situation inside a federal build...

It is generally acknowledged that immovable property taxes are one of the main revenue sources for local government. The literature emphasizes that the administration of property taxes needs well-developed inventories or registers that provide complete and accurate records of the taxed properties and their legaleconomic attributes. This requirement is generally fulfilled by Spatial Data Infrast...

Task-specific applications demand abstractions (generalized) 3D scenes of 3D models to be used for visualization and analysis purposes. Therefore, lower LoDs (level-of-details) from higher LoDs need to be made available to these applications. A unified generalization framework is proposed to derive multiple LoDs (LoD3-LoD1) taking both semantics and geometric aspects of 3D buildings modelled in...

In this paper, a novel framework for generalization of 3D city models based on CityGML and X3D is proposed. In the proposed framework, the CityGML files are first parsed into a Java environment to acquire the city model information using Citygml4j, an open source Java API. Generalization is then performed in the Java environment. The outcome of the generalisation is CityTree, a multiple represe...

With rapid population growth, there is an increasing demand for vertical use of space. The wide spread complex and high-rise buildings, as well the number infrastructure above or underground, requires new methods efficient management land property. 3D cadastre has, thus, become a necessity administration. However, success cadastral systems relies on definition legal institutional frameworks imp...

In a post-earthquake scenario, the semantic enrichment of 3D building models with seismic damage is crucial from perspective disaster management. This paper aims to present methodology and results for Level Detail 3 (LOD3) modelling (after an earthquake) semantics based on European Macroseismic Scale (EMS-98). The study area Vrisa traditional settlement island Lesvos, Greece, which was affected...