Searched for: subject:"3D%5C+city%5C+model"
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Labetski, A. (author), van Gerwen, Stefan (author), Tamminga, G.F. (author), Ledoux, H. (author), Stoter, J.E. (author)
CityGML, an OGC standard, is an open data model for virtual 3D city models and includes buildings, roads, terrain, water bodies, etc. While many modules are well-developed (eg buildings, bridges, tunnels), the transportation model is, based on our consultations with various government agencies and municipalities, not sufficient for most...
conference paper 2018
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Ortega-Córdova, Lessie (author)
3D city models are now common planning and analysis tools. Urban vegetation as a feature in these models, however, is neglected overshadowed by the focus on buildings, so its inclusion in 3D city models is often symbolic. On the other hand, urban vegetation improves the comfort and social well being of a city’s inhabitants and is a resource for...
master thesis 2018
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Ledoux, H. (author)
The validity of 3D primitives in 3D GIS datasets is often a prerequisite for using them in simulation and decision-making software, e.g. visibility analysis, noise pollution assessment, and energy estimation. However, while agreed definitions exist (in the international standard ISO19107), most software vendors ignore them and implement simpler...
journal article 2018
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Dukai, Balázs (author)
There are several 3D city models available openly, worldwide. These models are used in various applications, from which many expects a homogeneous Level of Detail (LoD). Validating the accuracy of the LoD of a model requires the inference its LoD class and its conformance to the real-world object. This process quickly becomes infeasible for...
master thesis 2018
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Zhou, K. (author), Gorte, B.G.H. (author)
In VHR(very high resolution) aerial images, shadows indicating height information are valuable for validating or detecting changes on an existing 3D city model. In the paper, we propose a novel and full automatic approach for shadow detection from VHR images. Instead of automatic thresholding, the supervised machine learning approach is...
conference paper 2017
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Tryfona, Maya (author)
The use of 3D city models has increased the last decades due to the evolution of technology. Their use is related to the need for solutions on issues that correspond to the building environment. Modelling aspects, like geometric, semantic information and topology are necessary, in order to provide an integrated result of spatial analysis. The...
master thesis 2017
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Biljecki, F. (author), Ledoux, H. (author), Stoter, J.E. (author)
Elevation datasets (e.g. point clouds) are an essential but often unavailable ingredient for the construction of 3D city models. We investigate in this paper to what extent can 3D city models be generated solely from 2D data without elevation measurements. We show that it is possible to predict the height of buildings from 2D data (their...
journal article 2017
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Biljecki, F. (author)
The concept of level of detail (LOD) describes the content of 3D city models and it plays an essential role during their life cycle. On one hand it comes akin to the concepts of scale in cartography and LOD in computer graphics, on the other hand it is a standalone concept that requires attention. LOD has an influence on tendering and...
doctoral thesis 2017
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Biljecki, F. (author), Sindram, M. (author)
Building datasets (e.g. footprints in OpenStreetMap and 3D city models) are becoming increasingly available worldwide. However, the thematic (attribute) aspect is not always given attention, as many of such datasets are lacking in completeness of attributes. A prominent attribute of buildings is the year of construction, which is useful for some...
conference paper 2017
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Biljecki, F. (author), Ledoux, H. (author), Du, X. (author), Stoter, J.E. (author), Soon, Kean Huat (author), Khoo, Victor (author)
To be used as input in most simulation and modelling software, 3D city models should be geometrically and topologically valid, and semantically rich. We investigate in this paper what is the quality of currently available CityGML datasets, i.e. we validate the geometry/topology of the 3D primitives (Solid and MultiSurface), and we validate...
conference paper 2016
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Nourian Ghadikolaee, P. (author), Goncalves, R. (author), Zlatanova, S. (author), Arroyo Ohori, G.A.K. (author), Vu Vo, A. (author)
Voxel representations have been used for years in scientific computation and medical imaging. The main focus of our research is to provide easy access to methods for making large-scale voxel models of built environment for environmental modelling studies while ensuring they are spatially correct, meaning they correctly represent topological and...
journal article 2016
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Sirmacek, B. (author), Lindenbergh, R.C. (author), Wang, J. (author)
3D urban models are valuable for urban map generation, environment monitoring, safety planning and educational purposes. For 3D measurement of urban structures, generally airborne laser scanning sensors or multi-view satellite images are used as a data source. However, close-range sensors (such as terrestrial laser scanners) and low cost cameras...
journal article 2016
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Nourian, P. (author), Gonçalves, Romulo (author), Zlatanova, S. (author), Arroyo Ohori, G.A.K. (author), Vu Vo, Anh (author)
Voxel representations have been used for years in scientific computation and medical imaging. The main focus of our research is to provide easy access to methods for making large-scale voxel models of built environment for environmental modelling studies while ensuring they are spatially correct, meaning they correctly represent topological...
journal article 2016
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Rook, Merwin (author), Biljecki, F. (author), Diakite, A.A. (author)
The lack of semantic information in many 3D city models is a considerable limiting factor in their use, as a lot of applications rely on semantics. Such information is not always available, since it is not collected at all times, it might be lost due to data transformation, or its lack may be caused by non-interoperability in data integration...
conference paper 2016
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Biljecki, F. (author), Stoter, J.E. (author), Ledoux, H. (author), Zlatanova, S. (author), Coltekin, A. (author)
In the last decades, 3D city models appear to have been predominantly used for visualisation; however, today they are being increasingly employed in a number of domains and for a large range of tasks beyond visualisation. In this paper, we seek to understand and document the state of the art regarding the utilisation of 3D city models across...
journal article 2015
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Mulder, D.T. (author)
In recent years, the concept of 3D city models has been gaining in importance as more 3D geometry of urban areas is becoming available. Although 3D City models offer a structured way of storing geometry, in practice a significant amount of geometry is not considered valid. This hinders the further analyzing or processing of these models. Since...
master thesis 2015
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Biljecki, F. (author), Ledoux, H. (author), Stoter, J. (author)
This paper describes the analysis of the propagation of positional uncertainty in 3D city models to the uncertainty in the computation of their volumes. Current work related to error propagation in GIS is limited to 2D data and 2D GIS operations, especially of rasters. In this research we have (1) developed two engines, one that generates random...
conference paper 2014
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Biljecki, F. (author), Ledoux, H. (author), Stoter, J.E. (author), Zhao, J. (author)
The level of detail in 3D city modelling, despite its usefulness and importance, is still an ambiguous and undefined term. It is used for the communication of how thoroughly real-world features have been acquired and modelled, as we demonstrate in this paper. Its definitions vary greatly between practitioners, standards and institutions. We...
journal article 2014
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Biljecki, F. (author), Zhao, J. (author), Stoter, J.E. (author), Ledoux, H. (author)
This review paper discusses the concept of level of detail in 3D city modelling, and is a first step towards a foundation for a standardised definition. As an introduction, a few level of detail specifications, outlooks and approaches are given from the industry. The paper analyses the general uncertainties and shortcomings around the concept of...
conference paper 2013
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Verbree, E. (author), De Vries, M.E. (author), Gorte, B.G.H. (author), Oude Elberink, S. (author), Karimiou, G. (author)
Water run-off modelling applied within urban areas requires an appropriate detailed surface model represented by a raster height grid. Accurate simulations at this scale level have to take into account small but important water barriers and flow channels given by the large-scale map definitions of buildings, street infrastructure, and other...
conference paper 2013
Searched for: subject:"3D%5C+city%5C+model"
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