Searched for: author%3A%22Ledoux%252C%255C+H.%22
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Pronk, M.J. (author), Hooijer, Aljosja (author), Eilander, Dirk (author), Haag, Arjen (author), de Jong, Tjalling (author), Vousdoukas, Michalis (author), Vernimmen, Ronald (author), Ledoux, H. (author), Eleveld, M.A. (author)
Coastal elevation data are essential for a wide variety of applications, such as coastal management, flood modelling, and adaptation planning. Low-lying coastal areas (found below 10 m +Mean Sea Level (MSL)) are at risk of future extreme water levels, subsidence and changing extreme weather patterns. However, current freely available elevation...
journal article 2024
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Powałka, Leon (author), Poon, Chris (author), Xia, Yitong (author), Meines, Siebren (author), Yan, Lan (author), Cai, Yuduan (author), Stavropoulou, G. (author), Dukai, B. (author), Ledoux, H. (author)
When it comes to storing 3D city models in a database, the implementation of the CityGML data model can be quite demanding and often results in complicated schemas. As an example, 3DCityDB, a widely used solution, depends on a schema having 66 tables, mapping closely the CityGML architecture. In this paper, we propose an alternative (called ...
conference paper 2024
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Gao, W. (author), Nan, L. (author), Boom, Bas (author), Ledoux, H. (author)
We introduce a novel deep learning-based framework to interpret 3D urban scenes represented as textured meshes. Based on the observation that object boundaries typically align with the boundaries of planar regions, our framework achieves semantic segmentation in two steps: planarity-sensible over-segmentation followed by semantic...
journal article 2023
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Ibrahimli, N. (author), Ledoux, H. (author), Kooij, J.F.P. (author), Nan, L. (author)
We propose an enhancement module called depth discontinuity learning (DDL) for learning-based multi-view stereo (MVS) methods. Traditional methods are known for their accuracy but struggle with completeness. While recent learning-based methods have improved completeness at the cost of accuracy, our DDL approach aims to improve accuracy while...
journal article 2023
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Vitalis, S. (author), Labetski, A. (author), Ledoux, H. (author), Stoter, J.E. (author)
Roads are important for many urban planning applications, such as traffic modelling and delivery vehicle routing. At present, most available datasets represent roads only as centrelines. This is particularily true for OpenStreetMap which provides, among many features, road networks at worldwide coverage. Furthermore, most approaches for...
journal article 2022
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Ledoux, H. (author), Dukai, B. (author), Penninga, Friso (author), van den Brink, Linda (author), Stoter, J.E. (author)
3D-representaties van onze leefomgeving zijn belangrijk in toepassingen die helpen bij de planning, de inrichting en het beheer van de openbare ruimte. Met 3D-modellen kunnen simulaties worden uitgevoerd voor bijvoorbeeld geluid, energie, luchtkwaliteit, windcomfort, zicht en wateroverlast. Om deze simulaties te bedienen met dezelfde 3D-gegevens...
journal article 2022
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Pađen, I. (author), Garcia Sanchez, C. (author), Ledoux, H. (author)
In the computational fluid dynamics simulation workflow, the geometry preparation step is often regarded as a tedious, time-consuming task. Many practitioners consider it one of the main bottlenecks in the simulation process. The more complex the geometry, the longer the necessary work, meaning this issue is amplified for urban flow simulations...
journal article 2022
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Chen, Z. (author), Ledoux, H. (author), Khademi, S. (author), Nan, L. (author)
While three-dimensional (3D) building models play an increasingly pivotal role in many real-world applications, obtaining a compact representation of buildings remains an open problem. In this paper, we present a novel framework for reconstructing compact, watertight, polygonal building models from point clouds. Our framework comprises three...
journal article 2022
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Roy, E.I. (author), Pronk, Maarten (author), Agugiaro, G. (author), Ledoux, H. (author)
Data on the number of floors is required for several applications, for instance, energy demand estimation, population estimation, and flood response plans. Despite this, open data on the number of floors is very rare, even when a 3D city model is available. In practice, it is most often inferred with a geometric method: elevation data is used...
journal article 2022
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Ledoux, H. (author), Biljecki, Filip (author), Dukai, B. (author), Kumar, Kavisha (author), Peters, R.Y. (author), Stoter, J.E. (author), Commandeur, T.J.F. (author)
Three-dimensional city models are essential to assess the impact that environmental factors will have on citizens, because they are the input to several simulation and prediction software. Examples of such environmental factors are noise (Stoter et al., 2008), wind (Garcı́a-Sánchez et al., 2014), air pollution (Ujang et al., 2013), and...
journal article 2021
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Gao, W. (author), Nan, L. (author), Boom, Bas (author), Ledoux, H. (author)
Recent developments in data acquisition technology allow us to collect 3D texture meshes quickly. Those can help us understand and analyse the urban environment, and as a consequence are useful for several applications like spatial analysis and urban planning. Semantic segmentation of texture meshes through deep learning methods can enhance...
journal article 2021
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Kölle, Michael (author), Laupheimer, Dominik (author), Schmohl, Stefan (author), Haala, Norbert (author), Rottensteiner, Franz (author), Wegner, Jan Dirk (author), Ledoux, H. (author)
Automated semantic segmentation and object detection are of great importance in geospatial data analysis. However, supervised machine learning systems such as convolutional neural networks require large corpora of annotated training data. Especially in the geospatial domain, such datasets are quite scarce. Within this paper, we aim to alleviate...
journal article 2021
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Kumar, Kavisha (author), Ledoux, H. (author), Schmidt, Richard (author), Verheij, Theo (author), Stoter, J.E. (author)
This paper presents our implementation of a harmonized data model for noise simulations in the European Union (EU). Different noise assessment methods are used by different EU member states (MS) for estimating noise at local, regional, and national scales. These methods, along with the input data extracted from the national registers and...
journal article 2020
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Stoter, J.E. (author), Peters, R.Y. (author), Commandeur, T.J.F. (author), Dukai, B. (author), Kumar, Kavisha (author), Ledoux, H. (author)
Noise is one of the main problems in urban areas. To monitor and manage noise problems, governmental organisations at all levels are obliged to regularly carry out noise studies. The simulation of noise is an important part of these studies. Currently, different organisations collect their own 3D input data as required in noise simulation in a...
journal article 2020
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Krijnen, T.F. (author), Noardo, F. (author), Arroyo Ohori, G.A.K. (author), Ledoux, H. (author), Stoter, J.E. (author)
The Industry Foundation Classes are a prevalent open standard to exchange Building Information Models. In such a model, geometric representations are provided for individual building elements along with semantic information, including a significant amount of properties related togeometry and explicit topological relationships. These...
conference paper 2020
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Ledoux, H. (author), Arroyo Ohori, G.A.K. (author), Peters, R.Y. (author)
The book Computational modelling of terrains presents an overview of algorithms and methodologies to reconstruct, manipulate, and extract information from terrains.<br/><br/>It covers different representations of terrains (eg TINs, rasters, point clouds, contour lines) and presents techniques to handle large datasets.
book 2020
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Stoter, J.E. (author), Arroyo Ohori, G.A.K. (author), Dukai, B. (author), Labetski, A. (author), Kumar, Kavisha (author), Vitalis, S. (author), Ledoux, H. (author)
Semantically enriched 3D city models have the potential to be powerful hubs of integrated information for computer-based urban spatial analysis. This article presents the state of the art in 3D city modelling in the context of broader developments such as smart cities and digital twins, and outlines six challenges that must be overcome before 3D...
journal article 2020
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Ledoux, H. (author)
IndoorGML datasets allow us to represent both (1) the geometry of the interior of a building, which is subdivided into <i>cells</i> (eg rooms, corridors, staircases); and (2) the navigation graph between these cells, which also acts as a mechanism to store the topological relationships between the cells. To be used in applications such as...
journal article 2020
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Dukai, B. (author), Peters, R.Y. (author), Wu, T. (author), Commandeur, T.J.F. (author), Ledoux, H. (author), Baving, T. (author), Post, M. (author), van Altena, V.P. (author), Van Hinsbergh, W. (author), Stoter, J.E. (author)
As in many countries, in The Netherlands governmental organisations are acquiring 3D city models to support their public tasks. However, this is still being done within individual organisation, resulting in differences in 3D city models within one country and sometimes covering the same area: i.e. differences in data structure, height...
journal article 2020
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Vitalis, S. (author), Labetski, A. (author), Boersma, F. (author), Dahle, F. (author), Li, X. (author), Arroyo Ohori, G.A.K. (author), Ledoux, H. (author), Stoter, J.E. (author)
As web applications become more popular, 3D city models would greatly benefit from a proper web-based solution to visualise and manage them. CityJSON was introduced as a JSON encoding of the CityGML data model and promises, among several benefits, the ability to be integrated with modern web technologies. In order to provide an implementation...
journal article 2020
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