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A framework to enhance semantic flexibility for analysis of distributed phenomena / J Mcintosh in International journal of geographical information science IJGIS, vol 19 n° 10 (november 2005)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 19 n° 10 (november 2005) . - pp 999 - 1018 Titre : A framework to enhance semantic flexibility for analysis of distributed phenomena Type de document : Article/Communication Auteurs : J Mcintosh, Auteur ; M. Yuan, Auteur Année de publication : 2005 Article en page(s) : pp 999 - 1018 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale [Termes IGN] analyse d'image orientée objet [Termes IGN] analyse spatiale [Termes IGN] distribution spatiale [Termes IGN] données maillées [Termes IGN] données vectorielles [Termes IGN] information sémantique [Termes IGN] modèle conceptuel de données spatio-temporelles [Termes IGN] modèle logique de données [Termes IGN] problème des valeurs limites [Termes IGN] représentation des détails topographiques [Termes IGN] représentation multiple [Termes IGN] requête spatiotemporelle [Termes IGN] seuillage [Termes IGN] système d'information géographique [Termes IGN] variance Résumé : (Auteur) While some geographic phenomena hold uniform properties, such as land-use zones, many geographic phenomena are distributed such that their properties vary across an extended area. While such distributed phenomena are best represented as continuous surfaces, individual objects (or features) often emerge among clusters of high or low values in a field. For example, areas of relatively high elevation may be viewed as hills, while flat low-lying areas are perceived as plains in a terrain. A comprehensive spatial analysis of distributed phenomena should examine both the spatial variance of its attribute surfaces and the characteristics of individual objects embedded in the field. An immediate research challenge to meet such spatial analysis needs is that these emerging features often have vague boundaries that vary according to the use and the user. The nature, and even existence, of these objects depend upon the range of values, or thresholds, used to define them. We propose a representation framework that takes a dual raster-vector approach to capture both field- and object-like characteristics of distributed phenomena and maintain multiple representations of embedded features delineated by boundaries that are likely to be relevant for the expected uses of the data. We demonstrate how boundaries influence the analysis and understanding of spatiotemporal characteristics of distributed phenomena. Using precipitation as a proof of concept, we show how the proposed framework enhances semantic flexibility in spatiotemporal query and analysis of distributed phenomena in geographic information systems. Numéro de notice : A2005-496 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810500197652 En ligne : https://doi.org/10.1080/13658810500197652 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27632 [article]

Exemplaires(2)

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An integrated TIN and Grid method for constructing multi-resolution digital terrain models / B. Yang in International journal of geographical information science IJGIS, vol 19 n° 10 (november 2005)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 19 n° 10 (november 2005) . - pp 1019 - 1038 Titre : An integrated TIN and Grid method for constructing multi-resolution digital terrain models Type de document : Article/Communication Auteurs : B. Yang, Auteur ; Wei Shi, Auteur ; Qi Li, Auteur Année de publication : 2005 Article en page(s) : pp 1019 - 1038 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Information géographique [Termes IGN] analyse multirésolution [Termes IGN] modèle numérique de terrain [Termes IGN] système d'information géographique [Termes IGN] tessellation [Termes IGN] Triangulated Irregular Network [Termes IGN] visualisation 3D Résumé : (Auteur) Multi-resolution terrain models are an efficient approach to improve the speed of three dimensional (3D) visualizations, especially for terrain visualization in Geographical Information Systems (GIS). As a further development to existing algorithms and models, a new model is proposed for the construction of multiresolution terrain models in a 3D GIS. The new model represents multi-resolution terrains using two major methods for terrain representation: Triangulated Irregular Network (TIN) and regular grid (Grid). In this paper, first, the concepts and formal definitions of the new model are presented. Second, the methodology for constructing multi-resolution terrain models based on the new model is proposed. Third, the error of multi-resolution terrain models is analysed, and a set of rules is proposed to retain the important features (e.g. boundaries of man-made objects) within the multi-resolution terrain models. Finally, several experiments are undertaken to test the performance of the new model. The experimental results demonstrate that the new model can be applied to construct multi-resolution terrain models with good performance in terms of time cost and maintenance of the important features. Furthermore, a comparison with previous algorithms/models shows that the speed of rendering for 3D walking/flying through has been greatly improved by applying the new model. Numéro de notice : A2005-497 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810500391156 En ligne : https://doi.org/10.1080/13658810500391156 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27633 [article]

Exemplaires(2)

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A combinatorial data model for representing topological relations among 3D geographical features in micro-spatial environments / J. Lee in International journal of geographical information science IJGIS, vol 19 n° 10 (november 2005)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 19 n° 10 (november 2005) . - pp 1039 - 1056 Titre : A combinatorial data model for representing topological relations among 3D geographical features in micro-spatial environments Type de document : Article/Communication Auteurs : J. Lee, Auteur ; Mei-Po Kwan, Auteur Année de publication : 2005 Article en page(s) : pp 1039 - 1056 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées [Termes IGN] analyse spatiale [Termes IGN] approche hiérarchique [Termes IGN] bati [Termes IGN] homologie [Termes IGN] modèle topologique de données [Termes IGN] objet géographique 3D [Termes IGN] relation topologique [Termes IGN] requête spatiale [Termes IGN] SIG 3D [Termes IGN] théorie des graphes [Termes IGN] visualisation 3D Résumé : (Auteur) This research is motivated by the need for 3D GIS data models that allow for 3D spatial query, analysis and visualization of the subunits and internal network structure of 'micro-spatial environments' (the 3D spatial structure within buildings). It explores a new way of representing the topological relationships among 3D geographical features such as buildings and their internal partitions or subunits. The 3D topological data model is called the combinatorial data model (CDM). It is a logical data model that simplifies and abstracts the complex topological relationships among 3D features through a hierarchical network structure called the node-relation structure (NRS). This logical network structure is abstracted by using the property of Poincaré duality. It is modelled and presented in the paper using graph-theoretic formalisms. The model was implemented with real data for evaluating its effectiveness for performing 3D spatial queries and visualization. Numéro de notice : A2005-498 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1080/13658810500399043 En ligne : https://doi.org/10.1080/13658810500399043 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27634 [article]

Exemplaires(2)

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An application of problem and product ontologies for the revision beach nourishments / Daniel van de Vlag in International journal of geographical information science IJGIS, vol 19 n° 10 (november 2005)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 19 n° 10 (november 2005) . - pp 1057 - 1072 Titre : An application of problem and product ontologies for the revision beach nourishments Type de document : Article/Communication Auteurs : Daniel van de Vlag, Auteur ; Bérengère Vasseur, Auteur ; Alfred Stein, Auteur ; Robert Jeansoulin, Auteur Année de publication : 2005 Article en page(s) : pp 1057 - 1072 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale [Termes IGN] altitude [Termes IGN] analyse de sensibilité [Termes IGN] classification automatique d'objets [Termes IGN] ensablement [Termes IGN] érosion côtière [Termes IGN] imprécision des données [Termes IGN] littoral [Termes IGN] ontologie [Termes IGN] Pays-Bas [Termes IGN] plage [Termes IGN] système d'information géographique Résumé : (Auteur) An ontological approach in GIS serves as a framework for the conceptualization of processes in the real world. In this paper, we examine an application in coastal change in the Netherlands, whereby beaches are subject to artificial nourishment to offset the effect of severe erosion. The use of ontologies helps to define two scenarios: S1 determined by the regulations from the Ministry for Public Works; S2 grounded on the abilities from an existing spatial dataset. A comparison between S1 and S2 shows that 72.8% of the objects suitable and unsuitable for nourishment are correctly classified. A higher overlap is found in areas where actual beach nourishments were carried out. Inaccuracies in attributes influence the determination of the objects. A sensitivity analysis applied to altitude illustrates a significant increase of objects suitable for nourishment for both scenarios, when altitude is decreased within the lower limit of the root mean square error for the 95% confidence interval. Moreover, the sensitivity of altitude shows that artificial boundaries for beach nourishment objects are not reasonable and consequently should be treated as vague objects. Numéro de notice : A2005-499 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810500032404 En ligne : https://doi.org/10.1080/13658810500032404 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27635 [article]

Exemplaires(2)

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079-05092	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Implementing a new model for simulating processes / F. Reitsma in International journal of geographical information science IJGIS, vol 19 n° 10 (november 2005)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 19 n° 10 (november 2005) . - pp 1073 - 1090 Titre : Implementing a new model for simulating processes Type de document : Article/Communication Auteurs : F. Reitsma, Auteur ; J. Albrecht, Auteur Année de publication : 2005 Article en page(s) : pp 1073 - 1090 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale [Termes IGN] analyse spatiale [Termes IGN] bassin hydrographique [Termes IGN] implémentation (informatique) [Termes IGN] modèle conceptuel de flux [Termes IGN] modèle dynamique [Termes IGN] processus spatio-temorel [Termes IGN] prototype [Termes IGN] requête spatiale [Termes IGN] ruissellement [Termes IGN] simulation Résumé : (Auteur) The paper describes the development of a new methodological approach for simulating geographic processes through the development of a data model that represents a process. This methodology complements existing approaches to dynamic modelling, which focus on the states of the system at each time step, by storing and representing the processes that are implicit in the model. The data model, called nen, focuses existing modelling approaches on representing and storing process information, which provides advantages for querying and analysing processes. The flux simulation framework was created utilizing the nen data model to represent processes. This simulator includes basic classes for developing a domain specific simulation and a set of query tools for inquiring after the results of a simulation. The methodology is prototyped with a watershed runoff simulation. Numéro de notice : A2005-500 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810500390943 En ligne : https://doi.org/10.1080/13658810500390943 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27636 [article]

Exemplaires(2)

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079-05092	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Query processing in spatial databases containing obstacles / Jun Zhang in International journal of geographical information science IJGIS, vol 19 n° 10 (november 2005)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 19 n° 10 (november 2005) . - pp 1091 - 1111 Titre : Query processing in spatial databases containing obstacles Type de document : Article/Communication Auteurs : Jun Zhang, Auteur ; Dimitris Papadias, Auteur ; et al., Auteur Année de publication : 2005 Article en page(s) : pp 1091 - 1111 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale [Termes IGN] appariement de graphes [Termes IGN] arbre-R [Termes IGN] barycentre [Termes IGN] base de données localisées [Termes IGN] distance euclidienne [Termes IGN] jointure spatiale [Termes IGN] plus proche voisin, algorithme du [Termes IGN] relation topologique [Termes IGN] requête spatiale Résumé : (Auteur) Despite the existence of obstacles in many database applications, traditional spatial query processing assumes that points in space are directly reachable and utilizes the Euclidean distance metric. In this paper, we study spatial queries in the presence of obstacles, where the obstructed distance between two points is defined as the length of the shortest path that connects them without crossing any obstacles. We propose efficient algorithms for the most important query types, namely, range search, nearest neighbours, e-distance joins, closest pairs and distance semi-joins, assuming that both data objects and obstacles are indexed by R-trees. The effectiveness of the proposed solutions is verified through extensive experiments. Numéro de notice : A2005-501 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810500286935 En ligne : https://doi.org/10.1080/13658810500286935 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27637 [article]

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
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079-05092	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Towards a potential research agenda to guide the implementation of spatial data infrastructures: a case study from India / Yola Georgiadou in International journal of geographical information science IJGIS, vol 19 n° 10 (november 2005)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 19 n° 10 (november 2005) . - pp 1113 - 1130 Titre : Towards a potential research agenda to guide the implementation of spatial data infrastructures: a case study from India Type de document : Article/Communication Auteurs : Yola Georgiadou, Auteur ; S.K. Puri, Auteur ; S. Sahay, Auteur Année de publication : 2005 Article en page(s) : pp 1113 - 1130 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Infrastructure de données [Termes IGN] cultures [Termes IGN] gestion de l'eau [Termes IGN] gestion des connaissances (organisation) [Termes IGN] implémentation (informatique) [Termes IGN] Inde [Termes IGN] infrastructure nationale des données localisées [Termes IGN] pays en développement Résumé : (Auteur) Recently, Spatial Data Infrastructures (SDIs) has been a rapidly expanding field and broadly assumed to underpin the development of information society and the knowledge economy. In this paper, we argue that the anticipated benefits of SDIs have largely not yet been generally realized in practice due to a lack of a robust theoretical framework as well as insufficient empirical research to guide the implementation efforts. We posit that learnings from the allied discipline of Information Infrastructures, which has matured during the 1990s in response to the proliferation of distributed, complex, and heterogeneous networked systems, can provide a useful theoretical lens to inform the emerging domain of SDIs. We focus on three key concepts identified in the domain of information infrastructure theory, viz. the installed base, reflexive standardization, and cultivation approach to design, to develop a theoretical framework, which is then applied to analyse the ongoing initiative to establish National Spatial Data Infrastructure (NSDI) in India. This analysis helps us to provide the basis to articulate a potential research agenda for both theory and practice-which, we believe, offers the promise to better conceptualize and implement SDIs, particularly in developing country settings like India. Numéro de notice : A2005-502 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810500286950 En ligne : https://doi.org/10.1080/13658810500286950 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27638 [article]

Exemplaires(2)

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Marine GIS: identification of mesoscale oceanic thermal fronts / V.D. Valavanis in International journal of geographical information science IJGIS, vol 19 n° 10 (november 2005)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 19 n° 10 (november 2005) . - pp 1131 - 1147 Titre : Marine GIS: identification of mesoscale oceanic thermal fronts Type de document : Article/Communication Auteurs : V.D. Valavanis, Auteur ; I. Katara, Auteur ; A. Palialexis, Auteur Année de publication : 2005 Article en page(s) : pp 1131 - 1147 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications SIG [Termes IGN] ArcInfo [Termes IGN] bathymétrie [Termes IGN] carte thématique [Termes IGN] chlorophylle [Termes IGN] circulation océanique [Termes IGN] image satellite [Termes IGN] isobathe [Termes IGN] Méditerranée, mer [Termes IGN] système d'information géographique [Termes IGN] température de surface de la mer Résumé : (Auteur) A new method (the 'sink' method) is proposed for the mapping of productive mesoscale oceanic thermal fronts based on the combined analysis of satellite imagery for sea surface temperature (SST) distribution and chlorophyll (CHL) concentration under a Geographic Information System (GIS). In an SST lattice data array, data value sinks describe heterogeneous drops in SST distribution as this is compared to more homogeneously distributed SST in the surrounding area. Using Arc/Info GIS, these thermal discontinuities are flagged and applied on SST and CHL imagery for the calculation of differences in SST and CHL patterns (DSST and DCHL) inside and outside of these flagged areas. Spatially connected sinks that are characterized by simultaneous negative DSST and positive DCHL pattern are mapped as thermal fronts. Results include a time series of monthly front occurrence GIS maps in Eastern Mediterranean waters along with three calculated front characteristics (DSST, DCHL and bathymetry). Comparisons between the mapped fronts and isobath distributions present clearly visible front-to-isobath spatial and shape associations while spatial analysis between front and wind data explains 66% of the number of mapped fronts. Numéro de notice : A2005-503 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810500391206 En ligne : https://doi.org/10.1080/13658810500391206 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27639 [article]

Exemplaires(2)

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GIS-based route planning in landslide-prone areas / A.K. Saha in International journal of geographical information science IJGIS, vol 19 n° 10 (november 2005)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 19 n° 10 (november 2005) . - pp 1149 - 1175 Titre : GIS-based route planning in landslide-prone areas Type de document : Article/Communication Auteurs : A.K. Saha, Auteur ; M.K. Arora, Auteur ; et al., Auteur Année de publication : 2005 Article en page(s) : pp 1149 - 1175 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications SIG [Termes IGN] couche thématique [Termes IGN] coût [Termes IGN] effondrement de terrain [Termes IGN] Himalaya [Termes IGN] planification [Termes IGN] prévention des risques [Termes IGN] réseau routier [Termes IGN] risque naturel [Termes IGN] système d'information géographique [Termes IGN] système expert [Termes IGN] utilisation du sol Résumé : (Auteur) Many parts of the world with young mountain chains, such as the Himalayas, are highly susceptible to landslides. Due to general ruggedness and steep slopes, roads provide the only way of transportation and connectivity in such terrains. Generally, landslide hazards are overlooked during route planning. In this study, in a test area in the Himalayas, various thematic layers, viz. landslide distribution, landslide hazard zonation, landuse/landcover, drainage order and lithology are generated and integrated using Remote Sensing GIS techniques. The integrated data layer in raster form has been called a 'thematic cost map' and provides an estimate of the cost of route development and maintenance. The relative cost assignment is based on experts' knowledge. Route planning is based on neighbourhood analysis to find various movement possibilities from a pixel to its immediate neighbours. A number of patterns such as those analogous to movements in chess games have been considered. Two new neighbourhood patterns, named here Knight31 and Knight32, have been conceived in addition to commonly used Rook, Bishop and Knight patterns. The neighbourhood movement cost for moving from one pixel to a connected neighbour has been calculated for a 7 x 7 pixel window considering distance, gradient cost and thematic cost. Dijkstra's algorithm has been applied to compute the least-cost route between source and destination points. A few examples are presented to show the utility of this approach for a landslide-safe automatic route planning for a highly rugged hilly terrain. Numéro de notice : A2005-504 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810500105887 En ligne : https://doi.org/10.1080/13658810500105887 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27640 [article]

Exemplaires(2)

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