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Ledoux, H. (author)
conference paper 2009
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Ledoux, H. (author)
conference paper 2009
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Ledoux, H. (author), Meijers, B.M. (author)
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...
book chapter 2009
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De Vries, M.E. (author), Ledoux, H. (author)
conference paper 2009
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Ledoux, H. (author), Meijers, B.M. (author)
One of the simplest methods to construct a 3D city model is to extrude building footprints to obtain \block-shaped" polyhedra representing buildings. While the method is well-known and easy to implement, if the 2D topological relationships between the footprints are not taken into account, the resulting 3D city models will not necessarily be...
journal article 2010
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Ledoux, H. (author), Meijers, B.M. (author)
Planar partitions—full tessellations of the plane into non-overlapping polygons—are frequently used in GIS to model concepts such as land cover, cadastral parcels or administrative boundaries. Since in practice planar partitions are often stored as a set of individual objects (polygons) to which attributes are attached (e.g. stored with a...
conference paper 2010
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Ledoux, H. (author)
Advances in technologies to collect elevation data are far superior to the advances to store and process the resulting point clouds. This paper investigates the use of a DBMS to store and manage not only the points coming from massive point-based datasets, but also a TIN of these points. TINs are used as a support structure to implement...
book chapter 2010
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Ledoux, H. (author)
conference paper 2010
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Biljecki, F. (author), Quak, C.W. (author), Ledoux, H. (author), Van Oosterom, P.J.M. (author)
conference paper 2010
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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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Ying, S. (author), Guo, R. (author), Li, L. (author), Van Oosterom, P.J.M. (author), Ledoux, H. (author), Stoter, J.E. (author)
In this paper the design and development of a prototype 3D Cadastral system will be presented. The key aspects of this system are that the model is based on Land Administration Domain Model (LADM) and that the spatial profile is based on a full 3D topological structure. The prototype development starts with profiling the LADM (selecting relevant...
conference paper 2011
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Boguslawski, P. (author), Gold, C. (author), Ledoux, H. (author)
While CityGML permits us to represent 3D city models, its use for applications where spatial analysis and/or real-time modifications are required is limited since at this moment the possibility to store topological relationships between the elements is rather limited and often not exploited. We present in this paper a new topological data...
journal article 2011
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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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Zhao, J. (author), Stoter, J. (author), Ledoux, H. (author), Zhu, Q. (author)
Many 3D GIS applications require 3D building models with different LoD (Level of Detail) that satisfy certain quality criteria. However, because of their complexity, most detailed 3D building models available are still produced manually, which results in inevitable geometric and topological errors. These errors hinder the downstream processing...
conference paper 2012
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Verbree, E. (author), Tijssen, T.P.M. (author), Ledoux, H. (author), Zlatanova, S. (author)
report 2012
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Blaauboer, J. (author), Goos, J. (author), Ledoux, H. (author), Penninga, F. (author), Reuvers, M. (author), Stoter, J.E. (author), Vosselman, M.G. (author)
Deze notitie is de eindrapportage van Activiteit 3 van de zes 3D Pilot NL Fase II activiteiten: Technische specificaties bestekteksten voor de opbouw van IMGeo-CityGML. De 3D Pilot is een initiatief van het Kadaster, Geonovum, de Nederlandse Commissie voor Geodesie en het Ministerie van Infrastructuur en Milieu, waarin meer dan 100 organisaties ...
report 2012
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Biljecki, F. (author), Ledoux, H. (author), Van Oosterom, P. (author)
The knowledge of the transportation mode used by humans (e. g. bicycle, on foot, car, and train) is critical for travel behaviour research, transport planning and traffic management. Nowadays, new technologies such as the GPS have replaced traditional survey methods (paper diaries, telephone) since they are more accurate and problems such as...
journal article 2013
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Oude Elberink, S. (author), Stoter, J. (author), Ledoux, H. (author), Commandeur, T. (author)
This paper describes the generation and dissemination of a national three-dimensional (3D) dataset representing the virtual and landscape model. The 3D model is produced automatically by fusing a two-dimensional (2D) national objectoriented database describing the physical landscape and the national high-resolution height model of the...
journal article 2013
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