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Geographic automata systems / Paul M. Torrens in International journal of geographical information science IJGIS, vol 19 n° 4 (april 2005)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 19 n° 4 (april 2005) . - pp 385 - 412 Titre : Geographic automata systems Type de document : Article/Communication Auteurs : Paul M. Torrens, Auteur ; Itzhak Benenson, Auteur Année de publication : 2005 Article en page(s) : pp 385 - 412 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale [Termes IGN] automate cellulaire [Termes IGN] géographie sociale [Termes IGN] géoréférencement [Termes IGN] milieu urbain [Termes IGN] modèle de simulation [Termes IGN] objet géographique [Termes IGN] système d'information géographique [Termes IGN] système multi-agents Résumé : (Auteur) A novel approach to automata-based modeling for spatial systems is described: geographic automata and Geographic Automata Systems. We detail a framework that takes advantage of the formalism of automata theory and GI Science to unite cellular automata and multi-agent systems techniques, and provides a spatial approach to bottom-up modeling of complex geographic systems that are comprised of infrastructure and human objects. The suitability of the framework is also discussed with reference to existing cellular automata and multi-agent systems models used in urban studies. Practical implementation of the framework is illustrated with reference to an object-based urban simulation environment and implementation of a popular socio-spatial segregation model. Numéro de notice : A2005-096 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810512331325139 En ligne : https://doi.org/10.1080/13658810512331325139 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27234 [article]

Exemplaires(2)

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079-05042	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Colour-coded pixel-based highly interactive web mapping for georeferenced data exploration / H. Zhao in International journal of geographical information science IJGIS, vol 19 n° 4 (april 2005)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 19 n° 4 (april 2005) . - pp 413 - 428 Titre : Colour-coded pixel-based highly interactive web mapping for georeferenced data exploration Type de document : Article/Communication Auteurs : H. Zhao, Auteur ; B. Shneiderman, Auteur Année de publication : 2005 Article en page(s) : pp 413 - 428 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique web [Termes IGN] carte choroplèthe [Termes IGN] carte interactive [Termes IGN] cartographie par internet [Termes IGN] couleur à l'écran [Termes IGN] échange dynamique de données [Termes IGN] exploration de données géographiques [Termes IGN] pixel [Termes IGN] système d'information géographique [Termes IGN] utilisateur [Termes IGN] visualisation cartographique [Termes IGN] web mapping Résumé : (Auteur) This paper describes a pixel-based technique that enables highly interactive Web choropleth maps for georeferenced data publishing and visual exploration. Instead of delivering geographic knowledge to the client in polygon-based vector formats, we encode geographic object IDs and shape information into highly compact pixel images (decoding maps). This allows the combination of raster and vector characteristics while avoiding the problems in the currently existing pixel-based (raster-lmage -based) or vector-based techniques. Differing from traditional pixel-based techniques that are static and allow very little user interaction, our pixel-based technique allows varieties of sub-second (less than 1 s) interface controls such as dynamic query, dynamic classification, geographic object data identification, user-setting adjusting, as well as turning on/off layers, panning and zooming, with no or minimum server support. Compared with Web GIS techniques that use vector geographic data, our technique avoids transferring over the network large vector geographic data. It also avoids the non-trivial client-side computation to interpret the vector data and render the maps. Our technique features a short initial download time, near-constant performance scalability for larger numbers of geographic objects, and download-map-segment- only-when-necessary which potentially reduces the overall data transfer over the network. As a result, it accommodates general public users with slow modem network connections and low-end machines, as well as users with fast T-1 connections and fast machines. The client-side (browser) is implemented as lightweight Java applets. YMap, an easy-to-use, user-task-oriented highly interactive mapping tool for visual georeferenced data exploration is implemented using this technique. The performance comparison of YMap to some other vector-based Web GIS demonstrates the feasibility and benefits of this technique. Numéro de notice : A2005-097 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/1365881051233125120 En ligne : https://doi.org/10.1080/1365881051233125120 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27235 [article]

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-05041	RAB	Revue	Centre de documentation	En réserve L003	Disponible
079-05042	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Embedding landscape processes into triangulated terrain models / E.R. Vivoni in International journal of geographical information science IJGIS, vol 19 n° 4 (april 2005)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 19 n° 4 (april 2005) . - pp 429 - 457 Titre : Embedding landscape processes into triangulated terrain models Type de document : Article/Communication Auteurs : E.R. Vivoni, Auteur ; V. Teles, Auteur ; V.Y. Ivanov, Auteur ; R.L. Bras, Auteur ; Dara Entekhabi, Auteur Année de publication : 2005 Article en page(s) : pp 429 - 457 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications SIG [Termes IGN] bassin hydrographique [Termes IGN] discrétisation spatiale [Termes IGN] érosion hydrique [Termes IGN] géomorphologie [Termes IGN] modèle de simulation [Termes IGN] pente [Termes IGN] prédiction [Termes IGN] ruissellement [Termes IGN] simulation [Termes IGN] système d'information géographique [Termes IGN] topographie [Termes IGN] Triangulated Irregular Network [Termes IGN] triangulation locale Résumé : (Auteur) Triangulated irregular networks (TIN) can form the basis for multiple-resolution representations in distributed hydrogeomorphic simulations over complex basins. Current methods for deriving TIN meshes depend primarily on surface slope without considering other terrain attributes significant to the watershed response such as the specific basin area. As an alternative, we present a methodology for combining a hydrogeomorphic or landscape index with an unstructured triangulated mesh. Landscape indices provide a concise method for describing steady-state terrain processes by isolating the dominant physical factors. The mesh-generation algorithm results in an adaptive discretization that resembles the spatial pattern of the landscape index with a high resolution retained in areas expected to impact the basin response. We compare the proposed algorithm with a slope-preserving method as a means for initializing the terrain representation in two TIN-based hydrogeomorphic models. Through three case studies in saturation-excess runoff, transport-limited soil erosion and shallow landslide simulation, we assess the distributed model sensitivity to the triangulated terrain algorithm. Model comparisons reveal that the process-based triangulations focus the distributed simulation in regions anticipated via a steady-state index to affect the transient watershed response. Numéro de notice : A2005-098 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810512331325111 En ligne : https://doi.org/10.1080/13658810512331325111 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27236 [article]

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-05041	RAB	Revue	Centre de documentation	En réserve L003	Disponible
079-05042	RAB	Revue	Centre de documentation	En réserve L003	Disponible

A proposed framework for feature-level geospatial data sharing: a case study for transportation network data / Z.R. Peng in International journal of geographical information science IJGIS, vol 19 n° 4 (april 2005)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 19 n° 4 (april 2005) . - pp 459 - 413 Titre : A proposed framework for feature-level geospatial data sharing: a case study for transportation network data Type de document : Article/Communication Auteurs : Z.R. Peng, Auteur Année de publication : 2005 Article en page(s) : pp 459 - 413 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications SIG [Termes IGN] accès aux données localisées [Termes IGN] données localisées [Termes IGN] extraction automatique [Termes IGN] format SVG [Termes IGN] fusion de données multisource [Termes IGN] GML [Termes IGN] internet [Termes IGN] logiciel libre [Termes IGN] modèle conceptuel de données localisées [Termes IGN] objet géographique [Termes IGN] Open geospatial consortium [Termes IGN] partage de données localisées [Termes IGN] réseau de transport [Termes IGN] temps réel [Termes IGN] Web Feature Service Résumé : (Auteur) Current data sharing in the Internet environment is supported using metadata at the file level. This approach has three fundamental shortcomings. First, sharing data from different sources with different semantics, data models, and acquisition methods usually requires data conversion and/or integration like data conflation. This can be tedious and error-prone. Second, data updated from one source cannot be automatically propagated to other related data or applications. Finally, data sharing at the file level makes it difficult to provide feature-level data for searching, accessing, and exchanging in real time over the Internet. This paper addresses these three issues by proposing a standards-based framework for sharing geospatial data in the transportation application domain. The proposed framework uses a standard data model-geospatial data model proposed by the Geospatial One-Stop initiative to harmonize the semantics and data models without the use of data integration methods. It uses Geography Markup Language (GML) for geospatial data coding and feature relationship, which provides a basis to propagate the data update from one source to related other sources and applications, and to search and extract data at the feature level. The framework uses the Web Feature Service (WFS) to search, access and extract data at the feature level from distributed sources. Finally, the Scalable Vector Graphics (SVG) standard was used for data display on the Web browser. Two transportation network datasets are used in the prototype case study to implement the proposed framework. The prototype allows the user to access and extract data at the feature level on the Web from distributed sources without downloading the full data file. It shows that the proposed standards-based feature-level data-sharing system is capable of sharing data without data conflation, accessing, and exchanging data in real time at the feature level. The prototype also shows that changes in one database can be automatically reflected or propagated in another related database without data downloading. Numéro de notice : A2005-099 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810512331319127 En ligne : https://doi.org/10.1080/13658810512331319127 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27237 [article]

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-05041	RAB	Revue	Centre de documentation	En réserve L003	Disponible
079-05042	RAB	Revue	Centre de documentation	En réserve L003	Disponible

An environmental decision-support system for the management of water pollution in a tidal river network / Yee Leung in International journal of geographical information science IJGIS, vol 19 n° 4 (april 2005)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 19 n° 4 (april 2005) . - pp 483 - 500 Titre : An environmental decision-support system for the management of water pollution in a tidal river network Type de document : Article/Communication Auteurs : Yee Leung, Auteur ; Y. Lee, Auteur ; K. Lin, Auteur ; F.T. Zeng, Auteur Année de publication : 2005 Article en page(s) : pp 483 - 500 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes d'information géographique [Termes IGN] architecture de système [Termes IGN] Chine [Termes IGN] environnement [Termes IGN] estuaire [Termes IGN] modèle orienté objet [Termes IGN] outil d'aide à la décision [Termes IGN] pollution des eaux [Termes IGN] réseau hydrographique [Termes IGN] système d'information géographique Résumé : (Auteur) This paper is about the development of a decision-support system for water-pollution management and environmental planning. More specifically, the paper first presents the overall concept and the system architecture of a generic environmental decision-support system (EDSS) and then develops an EDSS especially for analysing the tidal flow pattern and water quality of China's Pearl River Delta. The EDSS developed here employs the object-oriented approach to design the environmental database and utilizes the system integration technology to develop the overall user-friendly system that operates in the Windows environment. Furthermore, the system can be expanded to facilitate automated model selection and analysis. The EDSS should be of value for managing water quality of river networks with complicated flow patterns, such as that found in the Pearl River Delta. Numéro de notice : A2005-100 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1080/13658810412331317751 En ligne : https://doi.org/10.1080/13658810412331317751 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27238 [article]

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-05041	RAB	Revue	Centre de documentation	En réserve L003	Disponible
079-05042	RAB	Revue	Centre de documentation	En réserve L003	Disponible