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Multicriteria spatial decision analysis in web GIS environment / Harish Chandra Karnatak in Geoinformatica, vol 11 n° 4 (December 2007)

Public [article]  inGeoinformatica > vol 11 n° 4 (December 2007) . - pp 405 - 429 Titre : Multicriteria spatial decision analysis in web GIS environment Type de document : Article/Communication Auteurs : Harish Chandra Karnatak, Auteur ; S. Saran, Auteur ; K. Bhatia, Auteur ; P.S. Roy, Auteur Année de publication : 2007 Article en page(s) : pp 405 - 429 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications SIG [Termes IGN] analyse multicritère [Termes IGN] analyse spatiale [Termes IGN] approche hiérarchique [Termes IGN] ArcIms [Termes IGN] ArcSDE [Termes IGN] base de données documentaires [Termes IGN] biodiversité [Termes IGN] diffusion de données [Termes IGN] diffusion par internet [Termes IGN] Oracle 9I [Termes IGN] outil d'aide à la décision [Termes IGN] serveur de données localisées [Termes IGN] système d'information géographique Résumé : (Auteur) Internet, a client/server system, is a perfect means of GIS data accessing, analyzing and transmission. The World Wide Web, FTP (file transfer protocol) and HTTP programs make it convenient to access and transfer data files across the Internet. Using Internet for GIS makes it easy access to acquire GIS data from diverse data sources in the distributed environment. The geospatial multicriteria decision analysis in a client/server environment is an important and challenging task for the GIS community because of narrow Internet bandwidth for large geospatial data sets. In the present paper, we are developing a multicriteria decision analysis tool for spatial decision making in the web GIS environment. The developed system has been demonstrated for biodiversity conservation and priorities. An attempt has been made to generate the alternative decisions based on priority vectors. The multicriteria technique of Analytic Hierarchy Process (AHP) is used to derive the eigen vectors with the given multiple constraints of conflicting criteria and aims at selecting optimal alternative from the available sets. However, the evaluation recognizes the importance of expert knowledge when assigning the weights for the best spatial priorities. Comparing within classes and alternatives using judgment and decision matrix is based on Saaty's Pairwise Comparison. The Multicriteria Spatial Decision Support System (MC-SDSS) software development uses ASP, ArcIMS 9.0, ArcSDE9.0, and Oracle 9i data server in the web GIS environment. The database organization of spatial and non-spatial data is done in the RDBMS environment using ArcSDE and Oracle 9i data server. Copyright Springer Numéro de notice : A2007-468 Affiliation des auteurs : non IGN Thématique : BIODIVERSITE/GEOMATIQUE Nature : Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28831 [article]

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Logical representation of a conceptual model for spatial data warehouses / E. Malinowski in Geoinformatica, vol 11 n° 4 (December 2007)

Public [article]  inGeoinformatica > vol 11 n° 4 (December 2007) . - pp 431 - 457 Titre : Logical representation of a conceptual model for spatial data warehouses Type de document : Article/Communication Auteurs : E. Malinowski, Auteur ; E. Zimanyi, Auteur Année de publication : 2007 Article en page(s) : pp 431 - 457 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées [Termes IGN] contrainte d'intégrité [Termes IGN] entrepôt de données localisées [Termes IGN] modèle conceptuel de données localisées [Termes IGN] modèle logique de données [Termes IGN] modèle relationnel [Termes IGN] OLAP [Termes IGN] Oracle 10G [Termes IGN] SQL Résumé : (Auteur) The MultiDimER model is a conceptual model used for representing a multidimensional view of data for Data Warehouse (DW) and On-Line Analytical Processing (OLAP) applications. This model includes a spatial extension allowing spatiality in levels, hierarchies, fact relationships, and measures. In this way decision-making users can represent in an abstract manner their analysis needs without considering complex implementation issues and spatial OLAP tools developers can have a common vision for representing spatial data in a multidimensional model. In this paper we propose the transformation of a conceptual schema based on the MultiDimER constructs to an object-relational schema. We based our mapping on the SQL:2003 and SQL/MM standards giving examples of commercial implemen-tation using Oracle lOg with its spatial extension. Further we use spatial integrity constraints to ensure the semantic equivalence of the conceptual and logical schemas. We also show some examples of Oracle spatial functions, including aggregation functions required for the manipulation of spatial data. The described mappings to the object-relational model along with the examples using a commercial system show the feasibility of implementing spatial DWs in current commercial DBMSs. Further, using integrated architectures, where spatial and thematic data is defined within the same DBMS, facilitates the system management simplifying data definition and manipulation. Copyright Springer Numéro de notice : A2007-469 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28832 [article]

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Aim4GDI: facilitating the synthesis of GDI resources through mapping and surimpositions of metadata summaries / T. Aditya in Geoinformatica, vol 11 n° 4 (December 2007)

Public [article]  inGeoinformatica > vol 11 n° 4 (December 2007) . - pp 459 - 478 Titre : Aim4GDI: facilitating the synthesis of GDI resources through mapping and surimpositions of metadata summaries Type de document : Article/Communication Auteurs : T. Aditya, Auteur ; Menno-Jan Kraak, Auteur Année de publication : 2007 Article en page(s) : pp 459 - 478 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Infrastructure de données [Termes IGN] données localisées [Termes IGN] geoportail [Termes IGN] infrastructure européenne de données localisées [Termes IGN] métadonnées Résumé : (Auteur) In the world of geospatial data infrastructures, geoportals are developed to facilitate access and use of geospatial resources, including data. The design and implementation of effective and efficient geoportals are becoming crucial. Providing possibilities for users to organize and integrate available resources can arguably enhance the process of data discovery and spatial analysis required, and hence, is the focus of this paper. We argue that the synthesis of summaries of distributed datasets, map and feature services through the geoportal can present a coherent view to support data discovery. For this purpose, the atlas metaphor is used as an indexing server and integration interface of summaries. Thematic maps and a storyteller view are accessible through the atlas metaphor. They can be used to provide a supporting context for data discovery and access purposes. Copyright Springer Numéro de notice : A2007-470 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28833 [article]

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A relative representation of trajectories in geographical spaces / V. Noyon in Geoinformatica, vol 11 n° 4 (December 2007)

Public [article]  inGeoinformatica > vol 11 n° 4 (December 2007) . - pp 479 - 496 Titre : A relative representation of trajectories in geographical spaces Type de document : Article/Communication Auteurs : V. Noyon, Auteur ; Christophe Claramunt, Auteur ; Thomas Devogele, Auteur Année de publication : 2007 Article en page(s) : pp 479 - 496 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées [Termes IGN] base de données spatiotemporelles [Termes IGN] indexation spatiale [Termes IGN] modélisation spatio-temporelle [Termes IGN] trajectoire [Termes IGN] voisinage (topologie) Résumé : (Auteur) The research presented in this paper introduces a relative representation of trajectories in space and time. The objective is to represent space the way it is perceived by a moving observer acting in the environment, and to provide a complementary view to the usual absolute vision of space. Trajectories are characterized from the perception of a moving observer where relative positions and relative velocities are the basic primitives. This allows for a formal identification of elementary trajectory configurations, and their relationships with the regions that compose the environment. The properties of the model are studied, including transitions and composition tables. These properties characterize trajectory transitions by the underlying processes that semantically qualify them. The approach provides a representation that might help the understanding of trajectory patterns space and time. Copyright Springer Numéro de notice : A2007-471 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28834 [article]

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Convergence analysis and quality criteria for an iterative schematization of networks / S. Avelar in Geoinformatica, vol 11 n° 4 (December 2007)

Public [article]  inGeoinformatica > vol 11 n° 4 (December 2007) . - pp 497 - 513 Titre : Convergence analysis and quality criteria for an iterative schematization of networks Type de document : Article/Communication Auteurs : S. Avelar, Auteur Année de publication : 2007 Article en page(s) : pp 497 - 513 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées [Termes IGN] convergence [Termes IGN] généralisation cartographique automatisée [Termes IGN] indicateur de qualité [Termes IGN] intégrité topologique [Termes IGN] itération [Termes IGN] objet géographique linéaire [Termes IGN] simplification de surface Résumé : (Auteur) Schematic networks are linear abstractions of functional networks, such as route networks. Lines in the original network are modified in order to produce a schematic network which satisfies a set of constraints chosen to design the network. A method is described which accomplishes this line transformation using an iterative improvement technique driven by design constraints. The method maintains topological characteristics of the network by the use of simple geometric operations and tests. The iterative process can be repeated until the line displacements become small enough or until it meets user denned stopping criteria. Experimental results are provided to examine the acceptability of outcomes and the convergence of the applied iterative technique. Criteria for measuring the quality of results, as well as for stopping the iterative approach are presented. Copyright Springer Numéro de notice : A2007-472 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28835 [article]

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