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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), 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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Biljecki, F. (author), Quak, C.W. (author), Ledoux, H. (author), Van Oosterom, P.J.M. (author)
conference paper 2010
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De Vries, M.E. (author), Ledoux, H. (author)
conference paper 2009
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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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Peters, R.Y. (author), Ledoux, H. (author), Meijers, B.M. (author)
Depth-contours are an essential part of any hydrographic chart|a map of a water-body intended for safe ship navigation. Traditionally these were manually drawn by skilled hydrographers from a limited set of surveyed depth measurements. Nowadays this process of map making is shifted towards the digital domain, not in the last place because of the...
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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Ledoux, H. (author)
conference paper 2010
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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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Ledoux, H. (author)
conference paper 2009
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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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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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Oude Elberink, S. (author), Stoter, J. (author), Ledoux, H. (author), Commandeur, T. (author)
This paper describes the generation 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 object-oriented database describing the physical landscape and the national high-resolution height model of the Netherlands. Semantic...
conference paper 2013
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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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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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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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Ledoux, H. (author)
conference paper 2009
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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, 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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