Searched for: author%3A%22Ledoux%252C%255C+H.%22
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Ledoux, H. (author), Arroyo Ohori, K. (author)
While the edge-matching problem is usually tackled by snapping geometries within a certain threshold, we argue in this paper that this method is error-prone and often leads to geometries that are invalid. We present a novel edge-matching algorithm for polygons where vertices are not moved (no snapping is involved); instead gaps and overlaps...
conference paper 2011
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Arroyo Ohori, G.A.K. (author), Ledoux, H. (author), Meijers, B.M. (author), Stoter, J.E. (author)
Een van de uitdagingen van de Basisregistratie Grootschalige Topografie (BGT) is om de data afkomstig van de vele bronhouders samen te voegen tot één landsdekkende, topologisch correcte database. De regels in de BGT-catalogus zijn duidelijk en het combineren lijkt simpel. Maar de praktijk is weerbarstiger. In dit artikel leggen we uit waarom ...
journal article 2012
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Ledoux, H. (author), Arroyo Ohori, K. (author), Meijers, M. (author)
Although the validation of single polygons has received considerable attention, the automatic repair of invalid polygons has not. Automated repair methods can be considered as interpreting ambiguous or ill-defined polygons and giving a coherent and clearly defined output. At this moment, automatic tools are not satisfactory and repairing is thus...
conference paper 2012
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Stoter, J. (author), Ledoux, H. (author), Meijers, M. (author), Arroyo Ohori, K. (author), Van Oosterom, P. (author)
As explained in van Oosterom & Stoter (2012), the nD modeling approach allows us to include different aspects of geo-information in spatial modeling at a fundamental level, i.e. by treating these aspects as additional (geometric) dimensions. This paper explains how nD data models and data structures may solve the issues of redundancy and...
conference paper 2012
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Stoter, J.E. (author), Ledoux, H. (author), Meijers, B.M. (author), Arroyo Ohori, G.A.K. (author)
This paper presents the problem of the current separate treatment of levels of detail in city models. We propose a solution, detail the main principles, and present our initial results on the approach. We conclude with work in progress and explain the benefits of our approach.
conference paper 2012
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Arroyo Ohori, K. (author), Biljecki, F. (author), Stoter, J. (author), Ledoux, H. (author)
Real-world phenomena have traditionally been modelled in a GIS in two and three dimensions. However, powerful insights can be gained by the integration of additional non-spatial dimensions, such as time and scale, in a higher dimensional spatial model. While this theory is conceptually sound, there is a lack of understanding of its consequences...
conference paper 2013
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Arroyo Ohori, K. (author), Ledoux, H. (author), Stoter, J. (author)
Real-world phenomena have traditionally been modelled in 2D/3D GIS. However, powerful insights can be gained by integrating additional non-spatial dimensions, such as time and scale. While this integration to form higher-dimensional objects is theoretically sound, its implementation is problematic since the data models used in GIS are not...
conference paper 2013
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Arroyo Ohori, K. (author), Damiand, G. (author), Ledoux, H. (author)
There is substantial value in the use of higher-dimensional (>3D) digital objects in GIS that are built from complex real-world data. This use is however hampered by the difficulty of constructing such objects. In this paper, we present a dimension independent algorithm to build an n-dimensional cellular complex with linear geometries from its...
conference paper 2013
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Ledoux, H. (author), Meijers, M. (author), Arroyo Ohori, K. (author), Zhao, J. (author)
conference paper 2013
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Arroyo Ohori, G.A.K. (author), Ledoux, H. (author), Biljecki, F. (author), Stoter, J.E. (author)
The various levels of detail (LODs) of a 3D city model are often stored independently, without links between the representations of the same object, causing inconsistencies, as well as update and maintenance problems. One solution to this problem is to model the LOD as an extra geometric dimension perpendicular to the three spatial ones,...
journal article 2015
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Arroyo Ohori, G.A.K. (author), Ledoux, H. (author), Stoter, J.E. (author)
3D city models of the same region at multiple LODs are encumbered by the lack of links between corresponding objects across LODs. In practice, this causes inconsistency during updates and maintenance problems. A radical solution to this problem is to model the LOD of a model as a dimension in the geometric sense, such that a set of connected...
conference paper 2015
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Arroyo Ohori, G.A.K. (author), Ledoux, H. (author), Stoter, J.E. (author)
An alternative to the traditional approaches to model separately 2D/3D space, time, scale and other parametrisable characteristics in GIS lies in the higher-dimensional modelling of geographic information, in which a chosen set of non-spatial characteristics, e.g. time and scale, are modelled as extra geometric dimensions perpendicular to the...
conference paper 2016
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Biljecki, F. (author), Arroyo Ohori, G.A.K. (author), Ledoux, H. (author), Peters, R.Y. (author), Stoter, J.E. (author)
The remote estimation of a region’s population has for decades been a key application of geographic information science in demography. Most studies have used 2D data (maps, satellite imagery) to estimate population avoiding field surveys and questionnaires. As the availability of semantic 3D city models is constantly increasing, we investigate...
journal article 2016
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Arroyo Ohori, G.A.K. (author), Biljecki, F. (author), Diakite, A.A. (author), Krijnen, Thomas (author), Ledoux, H. (author), Stoter, J.E. (author)
Geographic information and building information modelling both model buildings and infrastructure, but the way in which they are modelled is usually complimentary and BIM-GIS integration is widely considered as a way forward for both domains. For one, more detailed BIM data can feed more general GIS data and GIS data can provide the context...
conference paper 2017
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Arroyo Ohori, G.A.K. (author), Ledoux, H. (author), Stoter, J.E. (author)
The concept of spacetime has long been used in physics to refer to models that integrate 3D space and time as a single 4D continuum. We argue in this paper that it is also advantageous to use this concept in a practical geographic context by realizing a true 4D model, where time is modeled and implemented as a dimension in the same manner as the...
journal article 2017
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Ledoux, H. (author), Arroyo Ohori, G.A.K. (author)
Datasets produced by different countries or organisations are seldom properly aligned and contain several discrepancies (e.g., gaps and overlaps). This problem has been so far almost exclusively tackled by snapping vertices based on a user-defined threshold. However, as we argue in this paper, this leads to invalid geometries, is error-prone,...
journal article 2017
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Arroyo Ohori, G.A.K. (author), Ledoux, H. (author), Stoter, J.E. (author)
Objects of more than three dimensions can be used to model geographic phenomena that occur in space, time and scale. For instance, a single 4D object can be used to represent the changes in a 3D object's shape across time or all its optimal representations at various levels of detail. In this paper, we look at how such higher-dimensional...
journal article 2017
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Stoter, J.E. (author), Arroyo Ohori, G.A.K. (author), Ledoux, H. (author)
The boundary between geo and BIM is getting fuzzy, but working with IFC models from practice shows that converting BIM data in a format useful in GIS and vice versa is still far from straightforward.
journal article 2018
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Diakite, A.A. (author), Krijnen, Thomas (author), Ledoux, H. (author), Arroyo Ohori, G.A.K. (author), Penninga, Friso (author), Stoter, J.E. (author)
GIS-data worden gebruikt om de leefomgeving te modelleren ten behoeve van<br/>ruimtelijke analyses en BIM-data voor het ontwerp, het bouwen en het beheer<br/>van bouwwerken. De grens tussen GIS en BIM vervaagt echter en er is een<br/>groeiende vraag om beide typen data te integreren.
journal article 2018
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Arroyo Ohori, G.A.K. (author), Biljecki, F. (author), Kumar, Kavisha (author), Ledoux, H. (author), Stoter, J.E. (author)
CityGML is the most important international standard used to model cities and landscapes in 3D with extensive semantics. Compared to BIM standards such as IFC, CityGML models are usually less detailed but they cover a much greater spatial extent. They are also available in any of five standardized levels of detail. CityGML serves as an exchange...
book chapter 2018
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