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Reducing uninteresting spatial association rules in geographic databases using background knowledge: a summary of results / Vania Bogorny in International journal of geographical information science IJGIS, vol 22 n° 4-5 (april 2008)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 22 n° 4-5 (april 2008) . - pp 361 - 386 Titre : Reducing uninteresting spatial association rules in geographic databases using background knowledge: a summary of results Type de document : Article/Communication Auteurs : Vania Bogorny, Auteur ; Bart Kuijpers, Auteur ; L. Alvares, Auteur Année de publication : 2008 Article en page(s) : pp 361 - 386 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées [Termes IGN] base de données localisées [Termes IGN] découverte de connaissances [Termes IGN] exploration de données géographiques [Termes IGN] règle d'association Résumé : (Auteur) Many association rule-mining algorithms have been proposed in the last few years. Their main drawback is the huge amount of generated patterns. In spatial association rule mining, besides the large amount of rules, many are well-known geographic domain associations explicitly represented in geographic database schemas. Existing algorithms have only considered the data, while the schema has not been considered. The result is that also the associations explicitly represented in geographic database schemas are extracted by association rule-mining algorithms. With the aim to reduce the number of well-known patterns and association rules, this paper presents a summary of results of a novel approach to extract patterns from geographic databases. A two step-pruning method is presented to avoid the generation of association rules that are previously known to be uninteresting. Experiments with real geographic databases show a considerable time reduction in both geographic data pre-processing and spatial association rule mining, with a very significant reduction in the total number of rules. Copyright Taylor & Francis Numéro de notice : A2008-144 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1080/13658810701412991 En ligne : https://doi.org/10.1080/13658810701412991 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29139 [article]

Exemplaires(2)

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A new approach to quantifying spatial contiguity using graph theory and spatial interaction / X. Wu in International journal of geographical information science IJGIS, vol 22 n° 4-5 (april 2008)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 22 n° 4-5 (april 2008) . - pp 387 - 407 Titre : A new approach to quantifying spatial contiguity using graph theory and spatial interaction Type de document : Article/Communication Auteurs : X. Wu, Auteur ; Alan T. Murray, Auteur Année de publication : 2008 Article en page(s) : pp 387 - 407 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale [Termes IGN] interaction spatiale [Termes IGN] paysage [Termes IGN] théorie des graphes [Termes IGN] voisinage (relation topologique) Résumé : (Auteur) Spatial contiguity is an important and fundamental landscape property in land allocation, habitat design, and forest management. The agreed upon notion of contiguity in the literature suggests shapelessness. However, existing approaches for measuring/promoting contiguity use proxies that either favour a particular shape or ignore inter-patch relationships in fragmented landscapes. We propose an unbiased relative measure of contiguity ranging from zero to one based on graph theory and spatial interaction. The new measure reflects intra-patch and inter-patch relationships by quantifying contiguity within patches and potential contiguity among patches. Empirical analysis suggests that this measure of contiguity is reliable, consistent, and insensitive to sub-region shape. Copyright Taylor & Francis Numéro de notice : A2008-146 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810701405615 En ligne : https://doi.org/10.1080/13658810701405615 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29141 [article]

Exemplaires(2)

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Exploring potential human activities in physical and virtual spaces: a spatio-temporal GIS approach / H. Yu in International journal of geographical information science IJGIS, vol 22 n° 4-5 (april 2008)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 22 n° 4-5 (april 2008) . - pp 409 - 430 Titre : Exploring potential human activities in physical and virtual spaces: a spatio-temporal GIS approach Type de document : Article/Communication Auteurs : H. Yu, Auteur ; Shih-Lung Shaw, Auteur Année de publication : 2008 Article en page(s) : pp 409 - 430 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes d'information géographique [Termes IGN] données spatiotemporelles [Termes IGN] espace-temps [Termes IGN] monde virtuel [Termes IGN] SIG 3D [Termes IGN] Time-geography Résumé : (Auteur) Today, the opportunity for potential human activity has gone beyond physical space to virtual space. Based on a proposed conceptual framework that models the relationships between physical and virtual spaces, this paper presents an attempt to adjust the space-time prism concept of Haumlgerstrand's time geography to identify potential activity opportunities in virtual space, focusing on the virtual space access channels available in physical space. A three-dimensional (3D) spatio-temporal Geographic Information System (GIS) design has been developed in this research to accommodate the adjusted space-time prism concept to support the representation, visualization, and analysis of potential human activities and interactions in physical and virtual spaces using the prism representation. Following the design, a prototype system has been successfully implemented in a 3D GIS environment. Such a system can provide powerful analytical tools for studies related to potential human activities and applications such as location-based services (LBS) and accessibility analysis in the information age. Copyright Taylor & Francis Numéro de notice : A2008-147 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1080/13658810701427569 En ligne : https://doi.org/10.1080/13658810701427569 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29142 [article]

Exemplaires(2)

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Population-density estimation using regression and area-to-point residual kriging / X. Liu in International journal of geographical information science IJGIS, vol 22 n° 4-5 (april 2008)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 22 n° 4-5 (april 2008) . - pp 431 - 447 Titre : Population-density estimation using regression and area-to-point residual kriging Type de document : Article/Communication Auteurs : X. Liu, Auteur ; P. Kyriakidis, Auteur ; Michael F. Goodchild, Auteur Année de publication : 2008 Article en page(s) : pp 431 - 447 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale [Termes IGN] densité de population [Termes IGN] figuration de la densité [Termes IGN] interpolation spatiale [Termes IGN] krigeage [Termes IGN] régression Résumé : (Auteur) Census population data are associated with several analytical and cartographic problems. Regression models using remote-sensing covariates have been examined to estimate urban population density, but the performance may not be satisfactory. This paper describes a kriging-based areal interpolation method, namely area-to-point residual kriging, which can be used to disaggregate the residuals remaining from regression. Compared with conventional cokriging, the area-to-point residual kriging is much simpler in that only a semivariogram model for the point residuals is required, as opposed to a set of auto- and cross-semivariogram models involving the dependent variable and all the covariates. In addition, area-to-point residual kriging explicitly accounts for any scale differences between source data and target values. The method is illustrated by disaggregating population from census units to the land-use zones within them. Comparative results for regression with and without area-to-point residual kriging show that area-to-point residual kriging can substantially improve interpolation accuracy. Copyright Taylor & Francis Numéro de notice : A2008-148 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810701492225 En ligne : https://doi.org/10.1080/13658810701492225 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29143 [article]

Exemplaires(2)

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Sweep-line algorithm for constrained Delaunay triangulation / V. Domiter in International journal of geographical information science IJGIS, vol 22 n° 4-5 (april 2008)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 22 n° 4-5 (april 2008) . - pp 449 - 462 Titre : Sweep-line algorithm for constrained Delaunay triangulation Type de document : Article/Communication Auteurs : V. Domiter, Auteur ; B. Zalik, Auteur Année de publication : 2008 Article en page(s) : pp 449 - 462 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique [Termes IGN] contrainte géométrique [Termes IGN] isoligne [Termes IGN] triangulation de Delaunay Résumé : (Auteur) This paper introduces a new algorithm for constrained Delaunay triangulation, which is built upon sets of points and constraining edges. It has various applications in geographical information system (GIS), for example, iso-lines triangulation or the triangulation of polygons in land cadastre. The presented algorithm uses a sweep-line paradigm combined with Lawson's legalisation. An advancing front moves by following the sweep-line. It separates the triangulated and non-triangulated regions of interest. Our algorithm simultaneously triangulates points and constraining edges and thus avoids consuming location of those triangles containing constraining edges, as used by other approaches. The implementation of the algorithm is also considerably simplified by introducing two additional artificial points. Experiments show that the presented algorithm is among the fastest constrained Delaunay triangulation algorithms available at the moment. Copyright Taylor & Francis Numéro de notice : A2008-149 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1080/13658810701492241 En ligne : https://doi.org/10.1080/13658810701492241 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29144 [article]

Exemplaires(2)

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The effect of instructions on distance and similarity judgements in information spatializations / Sara Irina Fabrikant in International journal of geographical information science IJGIS, vol 22 n° 4-5 (april 2008)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 22 n° 4-5 (april 2008) . - pp 463 - 478 Titre : The effect of instructions on distance and similarity judgements in information spatializations Type de document : Article/Communication Auteurs : Sara Irina Fabrikant, Auteur ; Daniel R. Montello, Auteur Année de publication : 2008 Article en page(s) : pp 463 - 478 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Cartographie [Termes IGN] détail topographique [Termes IGN] distance euclidienne [Termes IGN] représentation cognitive [Termes IGN] similitude [Termes IGN] visualisation de données Résumé : (Auteur) We investigate the relationship of perceived distances to judged similarities between document points in various types of spatialized displays. Our findings suggest that the distance-similarity relationship is not as self-evident to viewers as is commonly assumed in the information visualization literature. We further investigate how participants interpret instructions to judge distances when those instructions do or do not specify the type of distance. We find that in all types of spatialization displays, there is no significant difference between default and direct judgements of distance; people clearly interpret default distance instructions to refer to direct (straight-line) distance. These findings provide direct evidence on the conditions under which people employ distance when assessing similarity between data objects in various types of spatialized views and, when they do, which type of distance. They also give insight into how people explore the similarity of geographic features depicted in cartographic maps or GIS displays. Copyright Taylor & Francis Numéro de notice : A2008-150 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810701517096 En ligne : https://doi.org/10.1080/13658810701517096 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29145 [article]

Exemplaires(2)

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Hierarchical lane-oriented 3D road-network model / Q. Zhu in International journal of geographical information science IJGIS, vol 22 n° 4-5 (april 2008)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 22 n° 4-5 (april 2008) . - pp 479 - 505 Titre : Hierarchical lane-oriented 3D road-network model Type de document : Article/Communication Auteurs : Q. Zhu, Auteur ; Y. Li, Auteur Année de publication : 2008 Article en page(s) : pp 479 - 505 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes d'information géographique [Termes IGN] approche hiérarchique [Termes IGN] diagramme [Termes IGN] réseau routier [Termes IGN] segmentation dynamique [Termes IGN] SIG 3D [Termes IGN] UML [Termes IGN] voie de communication Résumé : (Auteur) The existing road-network models based on the 2D link-node of roadway centrelines have inhibited lane-oriented network flow analysis and multi-dimensional inventory management in complicated 3D urban environments. This paper proposes a hierarchical lane-oriented 3D road-network model (HL-3DRNM), with a unified modelling language (UML) diagram. HL-3DRNM is a non-planar topological model with the support of a 3D lane ribbon cartographic display, which is characterized by: (1) multiple topological and cartographic representations and various abstraction levels (street, road segment, carriageway and lane); and (2) referenced multi-dimensional road information (point, line, area and volume) at lane level. HL-3DRNM provides solid mathematical foundations for a more detailed inventory management, effective network analysis and realistic navigation in the increasingly complicated 3D urban transportation systems. Copyright Taylor & Francis Numéro de notice : A2008-151 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1080/13658810701492324 En ligne : https://doi.org/10.1080/13658810701492324 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29146 [article]

Exemplaires(2)

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Seeking the Pareto front for multiobjective spatial optimization problems / B. Huang in International journal of geographical information science IJGIS, vol 22 n° 4-5 (april 2008)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 22 n° 4-5 (april 2008) . - pp 507 - 526 Titre : Seeking the Pareto front for multiobjective spatial optimization problems Type de document : Article/Communication Auteurs : B. Huang, Auteur ; P. Fery, Auteur ; L. Xue, Auteur ; Y. Wang, Auteur Année de publication : 2008 Article en page(s) : pp 507 - 526 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications SIG [Termes IGN] approximation [Termes IGN] erreur systématique [Termes IGN] optimisation (mathématiques) [Termes IGN] réseau routier [Termes IGN] Singapour [Termes IGN] système d'information géographique Résumé : (Auteur) Spatial optimization problems, such as route selection, usually involve multiple, conflicting objectives relevant to locations. An ideal approach to solving such multiobjective optimization problems (MOPs) is to find an evenly distributed set of Pareto-optimal alternatives, which is capable of representing the possible trade-off among different objectives. However, these MOPs are commonly solved by combining the multiple objectives into a parametric scalar objective, in the form of a weighted sum function. It has been found that this method fails to produce a set of well spread solutions by disregarding the concave part of the Pareto front. In order to overcome this ill-behaved nature, a novel adaptive approach has been proposed in this paper. This approach seeks to provide an unbiased approximation of the Pareto front by tuning the search direction in the objective space according to the largest unexplored region until a set of well-distributed solutions is reached. To validate the proposed methodology, a case study on multiobjective routing has been performed using the Singapore road network with the support of GIS. The experimental results confirm the effectiveness of the approach. Copyright Taylor & Francis Numéro de notice : A2008-152 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810701492365 En ligne : https://doi.org/10.1080/13658810701492365 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29147 [article]

Exemplaires(2)

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A spatiotemporal data model for dynamic transit networks / R. Huang in International journal of geographical information science IJGIS, vol 22 n° 4-5 (april 2008)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 22 n° 4-5 (april 2008) . - pp 527 - 545 Titre : A spatiotemporal data model for dynamic transit networks Type de document : Article/Communication Auteurs : R. Huang, Auteur ; Z.R. Peng, Auteur Année de publication : 2008 Article en page(s) : pp 527 - 545 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées [Termes IGN] calcul d'itinéraire [Termes IGN] données spatiotemporelles [Termes IGN] modèle conceptuel de données localisées [Termes IGN] modèle orienté objet [Termes IGN] modèle topologique complet [Termes IGN] relation topologique [Termes IGN] réseau de transport Résumé : (Auteur) A transit network is a spatiotemporally dynamic system whose topology, components, and services all change over time. The complexity and dynamic nature of transit networks make it difficult to model by traditional transportation models. This paper presents an object-oriented data model that coherently represents space, time, and dynamics of transit networks and supports schedule-based pathfinding. In this data model, a transit network and its components are modelled as spatiotemporal objects that have properties and behaviours. Unlike traditional roadway transportation network models that define topology as connectivity between geometric elements such as edges and nodes, this data model uniquely defines topology as sequences and collections of transit features which are application domain objects. Moreover, this data model supports the generation of active network topologies based on given times to represent real-time network states as well as to reduce topological redundancy. Implementations of the data model in two Internet transit trip planners have demonstrated that it can effectively reduce computation complexity of schedule-based pathfinding algorithms and enhance pathfinding performance. Copyright Taylor & Francis Numéro de notice : A2008-153 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1080/13658810701492399 En ligne : https://doi.org/10.1080/13658810701492399 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29148 [article]

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
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079-08032	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Modelling three-dimensional [3D] geoscientific fields with the Voronoi diagram and its dual / Hugo Ledoux in International journal of geographical information science IJGIS, vol 22 n° 4-5 (april 2008)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 22 n° 4-5 (april 2008) . - pp 547 - 574 Titre : Modelling three-dimensional [3D] geoscientific fields with the Voronoi diagram and its dual Type de document : Article/Communication Auteurs : Hugo Ledoux, Auteur ; Christopher Gold, Auteur Année de publication : 2008 Article en page(s) : pp 547 - 574 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées [Termes IGN] diagramme de Voronoï [Termes IGN] Map Algebra [Termes IGN] modélisation spatiale [Termes IGN] SIG 3D [Termes IGN] triangulation de Delaunay Résumé : (Auteur) Fields as found in the geosciences have properties that are not usually found in other disciplines: the phenomena studied are often three-dimensional (3D), they tend to change continuously over time, and the collection of samples to study the phenomena is problematic, which often results in highly anisotropic distributions of samples. In the geographical information system (GIS) community, raster structures (voxels or octrees) are the most popular solutions, but, as we show in this paper, they have shortcomings for modelling and analysing 3D geoscientific fields. As an alternative to using rasters, we propose a new spatial model based on the Voronoi diagram (VD) and its dual the Delaunay tetrahedralisation (DT), and argue that they have many advantages over other tessellations. We discuss the main properties of the 3D VD/DT, present some GIS operations that are greatly simplified when the VD/DT is used, and, to analyse two or more fields, we also present a variant of the map algebra framework where all the operations are performed directly on VDs. The usefulness of this Voronoi-based spatial model is demonstrated with a series of potential applications. Copyright Taylor & Francis Numéro de notice : A2008-154 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1080/13658810701517120 En ligne : https://doi.org/10.1080/13658810701517120 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29149 [article]

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
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Sensitivity analysis of spatially aggregated responses: a gradient-based method / F. Pantus in International journal of geographical information science IJGIS, vol 22 n° 4-5 (april 2008)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 22 n° 4-5 (april 2008) . - pp 575 - 599 Titre : Sensitivity analysis of spatially aggregated responses: a gradient-based method Type de document : Article/Communication Auteurs : F. Pantus, Auteur ; N. Ellis, Auteur ; H. Possingham, Auteur ; et al., Auteur Année de publication : 2008 Article en page(s) : pp 575 - 599 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale [Termes IGN] agrégation spatiale [Termes IGN] algorithme du gradient [Termes IGN] analyse de sensibilité [Termes IGN] données socio-économiques [Termes IGN] espace vectoriel [Termes IGN] noeud [Termes IGN] polygone Résumé : (Auteur) We often need to report on environmental, economic and social indicators, and properties at aggregated spatial scales, e.g. average income per suburb. To do this, we invariably create reporting polygons that are somewhat arbitrary. The question arises: how much does this arbitrary subdivision of space affect the outcome? In this paper, we develop a new, gradient-based framework for carrying out a rigorous analysis of the sensitivity of integrating functions to quantitative changes in their spatial configuration. This approach is applied to both analytical and empirical models, and it allows the reporting of a hierarchy of sensitivity measures (from global to local). We found that the concepts of a vector space representing the spatial configurations and the response (hyper-)surface on which gradients indicate the sensitivities to be helpful in developing the sensitivity analytical framework of spatial configurations in different dimensions. This approach works well with both analytical and empirical integrating functions. This approach resulted in a clear ranking of the sensitivities of the responses to changes in the reporting regions in an existing environmental reporting application. The approach also allowed us to find which vertices, and the directions of change of those vertices, influenced the outcome most. The application of the spatial framework allows the results to be reported in a hierarchical way, from the sensitivities of an integrative response to changes in a whole reserve/reporting system, down to the sensitivity along each of the dimensions of the vertices in the spatial configuration. The results of the spatial sensitivity framework that we developed in this paper can be readily visualized by plotting the sensitivities as vectors on geographic maps. This simplifies the presentation and facilitates the uptake of the results in the situations where the spatial configurations are complicated. Numéro de notice : A2008-155 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810701587784 En ligne : https://doi.org/10.1080/13658810701587784 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29150 [article]

Exemplaires(2)

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079-08032	RAB	Revue	Centre de documentation	En réserve L003	Disponible