|
[n° ou bulletin]
[n° ou bulletin]
|  |
Exemplaires(2)
| Code-barres | Cote | Support | Localisation | Section | Disponibilité |
|---|---|---|---|---|---|
| 079-2010071 | RAB | Revue | Centre de documentation | En réserve L003 | Disponible |
| 079-2010072 | RAB | Revue | Centre de documentation | En réserve L003 | Disponible |
Dépouillements
Ajouter le résultat dans votre panierModeling the scale dependences of topological relations between lines and regions induced by reduction of attributes / S. Du in International journal of geographical information science IJGIS, vol 24 n°11-12 (december 2010)
Titre : Modeling the scale dependences of topological relations between lines and regions induced by reduction of attributes Type de document : Article/Communication Auteurs : S. Du, Auteur ; Q. Wang, Auteur ; Luo Guo, Auteur Année de publication : 2010 Article en page(s) : pp 1649 - 1686 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées
[Termes IGN] analyse multiéchelle
[Termes IGN] attribut
[Termes IGN] facteur d'échelle
[Termes IGN] généralisation cartographique automatisée
[Termes IGN] graphe
[Termes IGN] objet géographique linéaire
[Termes IGN] objet géographique zonal
[Termes IGN] relation topologiqueRésumé : (Auteur) The scale dependences of topological relations are caused by the changes of spatial objects at different scales, which are induced by the reduction of attributes. Generally, the detailed partitions and multi-scale attributes are stored in spatial databases, while the coarse partitions are not. Consequently, the detailed topological relations can be computed and regarded as known information, while the coarse relations stay unknown. However, many applications (e.g., multi-scale spatial data query) need to deal with the topological relations at multiple scales. In this study new methods are proposed to model and derive the scale dependences of topological relations between lines and multi-scale region partitions. The scale dependences of topological relations are modeled and used to derive the relations between lines and coarse partitions from the relations about the detailed partitions. The derivation can be performed in two steps. At the first step, the topological dependences between a line and two meeting, covered and contained regions are computed and stored into composition tables, respectively. At the second step, a graph is used to represent the neighboring relations among the regions in a detailed partition. The scale dependences and detailed relations are then used to derive topological relations at the coarse level. Our methods can also be extended to handle the scale dependences of relations about disconnected regions, or the combinations of connected and disconnected regions. Because our methods use the scale dependences to derive relations at the coarse level, rather than generating coarse partition and computing the relations with geometric information, they are more efficient to support scale-dependent applications. Numéro de notice : A2010-547 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1080/13658811003591672 En ligne : https://doi.org/10.1080/13658811003591672 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30739
in International journal of geographical information science IJGIS > vol 24 n°11-12 (december 2010) . - pp 1649 - 1686[article]Exemplaires(2)
Code-barres Cote Support Localisation Section Disponibilité 079-2010071 RAB Revue Centre de documentation En réserve L003 Disponible 079-2010072 RAB Revue Centre de documentation En réserve L003 Disponible
Titre : Graphical design of world map projections Type de document : Article/Communication Auteurs : Bernhard Jenny, Auteur ; T. Patterson, Auteur ; Lorenz Hurni, Auteur Année de publication : 2010 Article en page(s) : pp 1687 - 1702 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Projections
[Termes IGN] application informatique
[Termes IGN] carroyage géographique
[Termes IGN] déformation géométrique
[Termes IGN] logiciel libre
[Termes IGN] mappemonde
[Termes IGN] projectionRésumé : (Auteur) The design of new map projections has up until now required mathematical and cartographic expertise that has limited this activity to a small group of specialists. This article introduces the background mathematics for a software-based method that enables cartographers to easily design new small-scale world map projections. The software is usable even by those without mathematical expertise. A new projection is designed interactively in an iterative process that allows the designer to graphically and numerically assess the graticule, the representation of the continents, and the distortion properties of the new projection. The method has been implemented in Flex Projector, a free and open-source application enabling users to quickly create new map projections and modify existing projections. We also introduce new tools that help evaluate the distortion properties of projections, namely a configurable acceptance index to assess areal and angular distortion, a derived acceptance visualization, and interactive profiles through the distortion space of a projection. To illustrate the proposed method, a new projection, the Cropped Ginzburg VIII projection, is presented. Numéro de notice : A2010-548 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/POSITIONNEMENT Nature : Article DOI : 10.1080/13658811003596101 En ligne : https://doi.org/10.1080/13658811003596101 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30740
in International journal of geographical information science IJGIS > vol 24 n°11-12 (december 2010) . - pp 1687 - 1702[article]Exemplaires(2)
Code-barres Cote Support Localisation Section Disponibilité 079-2010071 RAB Revue Centre de documentation En réserve L003 Disponible 079-2010072 RAB Revue Centre de documentation En réserve L003 Disponible
Titre : Equal arc ratio projection and a new spherical triangle quadtree model Type de document : Article/Communication Auteurs : Y. Wen, Auteur ; Z. Dafang, Auteur ; Y. Wu, Auteur ; Q. Dongsheng, Auteur Année de publication : 2010 Article en page(s) : pp 1703 - 1723 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Projections
[Termes IGN] arbre quadratique
[Termes IGN] carroyage
[Termes IGN] icosahèdre
[Termes IGN] planisphère
[Termes IGN] projection équivalente
[Termes IGN] translation
[Termes IGN] trigonométrie sphériqueRésumé : (Auteur) A projection family, named Equal Arc Ratio Projection (EARP), is proposed in this paper, which has two kinds of geometric cases. Coordinates in the projections are determined by the ratios between four special arcs. The projection for spherical octahedron is derived, which is available for Dutton's Quaternary Triangular Mesh (QTM), and both projections of Goodchild's and Otoo's for QTM are found to be two special implementations of EARP. The icosahedral projection and thus the corresponding spherical triangle quadtree partition model are also developed. The partition model is compared with several other global grid models. Numéro de notice : A2010-549 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/POSITIONNEMENT Nature : Article DOI : 10.1080/13658811003619168 En ligne : https://doi.org/10.1080/13658811003619168 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30741
in International journal of geographical information science IJGIS > vol 24 n°11-12 (december 2010) . - pp 1703 - 1723[article]Exemplaires(2)
Code-barres Cote Support Localisation Section Disponibilité 079-2010071 RAB Revue Centre de documentation En réserve L003 Disponible 079-2010072 RAB Revue Centre de documentation En réserve L003 Disponible
Titre : Adjustment computation of HASM : a high-accuracy and high speed method Type de document : Article/Communication Auteurs : T. Yue, Auteur ; Shuo Wang, Auteur Année de publication : 2010 Article en page(s) : pp 1725 - 1743 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique
[Termes IGN] compensation par modèles
[Termes IGN] Kansou (Chine)
[Termes IGN] modèle numérique de surface
[Termes IGN] modélisation 2D
[Termes IGN] Setchouan (Chine)
[Termes IGN] surface (géométrie)
[Termes IGN] test de performance
[Termes IGN] traitement de données localisées
[Termes IGN] Tsinghai (Chine)
[Termes IGN] visualisation simultanéeRésumé : (Auteur) We developed a method for high-accuracy surface modeling (HASM) in terms of the fundamental theorem of surfaces, which has theoretically found a solution for error problems. However, the computing speed of HASM was too slow to be widely applied in practice. Thus, adjustment computation of HASM (HASM-AC) is developed in this article. For comparatively testing HASM-AC accuracy, a mathematical surface is first selected so that the true value is able to be predetermined to avoid uncontrollable data errors. The numerical test indicates that HASM-AC has the highest accuracy and its accuracy is 20.67, 15.67, and 14.67 times higher than the inverse distance weighting (IDW), kriging, and spline, respectively. Then, a 0.4 km times 0.5 km rectangular area is used to test the effects of different spatial resolutions and sampling intervals on accuracy. This real-world test demonstrates that HASM-AC accuracy increases at a much better and stable pace as the spatial resolution becomes finer and sampling intervals get shorter, compared to the classic methods. Finally, the computing speed is tested in an area with 6000 times 6000 grid cells where Qinghai, Gansu, and Sichuan provinces meet. The computing speed of HASM-AC is 11, 8, and 563 times faster than IDW, spline, and kriging, respectively, which makes HASM-AC able to process data in a huge size and make real-time visualization realizable. In short, HASM-AC performs best in both the numerical and real-world tests. Numéro de notice : A2010-550 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810903569580 En ligne : https://doi.org/10.1080/13658810903569580 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30742
in International journal of geographical information science IJGIS > vol 24 n°11-12 (december 2010) . - pp 1725 - 1743[article]Exemplaires(2)
Code-barres Cote Support Localisation Section Disponibilité 079-2010071 RAB Revue Centre de documentation En réserve L003 Disponible 079-2010072 RAB Revue Centre de documentation En réserve L003 Disponible
Titre : Ontologies of geographic information Type de document : Article/Communication Auteurs : Helen Couclelis, Auteur Année de publication : 2010 Article en page(s) : pp 1785 - 1809 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Infrastructure de données
[Termes IGN] approche hiérarchique
[Termes IGN] données localisées
[Termes IGN] information sémantique
[Termes IGN] ontologie
[Termes IGN] relation sémantique
[Termes IGN] utilisateurRésumé : (Auteur) This article explores the notion of a system of ontologies specifically designed for the needs of an information science. A framework for geographic information ontologies is outlined that focuses on geographic information constructs rather than on the direct representation of real-world entities or on linguistic terms. The framework takes the form of a generative hierarchy anchored by the notion of intentionality at one end and of a spatiotemporal field of potentially relevant information at the other. Two theoretical notions are used in the generation of the hierarchy. The first is the principle of semantic contraction, whereby, starting from a level of geographic information constructs specified so as to reflect user intentionality, semantically coherent domains of properties are removed over several steps until only the rudiments of a spatiotemporal information system are left. The second notion is that of object of discourse, which allows entities to be represented as the composites of geographic information constructs at the higher levels of the hierarchy, explicitly reflecting the connections between the purpose, function, appropriate internal constitution, and ensuing categorization of the entities represented. The framework's main contribution is thus twofold: first, it allows the notions of user purpose and object function to be directly built into geographic representations; second, it proposes a hierarchy of ontological levels that are linked by systematic semantic relations. Further, the framework presents an integrated view of object and field representations. It may also provide a novel perspective on a number of issues of ongoing interest in geographic information science. Numéro de notice : A2010-551 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658816.2010.484392 En ligne : https://doi.org/10.1080/13658816.2010.484392 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30743
in International journal of geographical information science IJGIS > vol 24 n°11-12 (december 2010) . - pp 1785 - 1809[article]Exemplaires(2)
Code-barres Cote Support Localisation Section Disponibilité 079-2010071 RAB Revue Centre de documentation En réserve L003 Disponible 079-2010072 RAB Revue Centre de documentation En réserve L003 Disponible
Titre : Applying time-dependent variance-based global sensitivity analysis to represent the dynamics of an agent-based model of land use change Type de document : Article/Communication Auteurs : A. Ligmann-Zielinska, Auteur ; L. Sun, Auteur Année de publication : 2010 Article en page(s) : pp 1829 - 1850 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale
[Termes IGN] analyse de sensibilité
[Termes IGN] changement d'occupation du sol
[Termes IGN] complexité
[Termes IGN] données spatiotemporelles
[Termes IGN] incertitude des données
[Termes IGN] modèle orienté agent
[Termes IGN] varianceRésumé : (Auteur) The growing body of knowledge on modeling land use systems points to epistemic uncertainty as one of the challenging obstacles in development and application of agent-based models (ABMs). To decrease outcome uncertainty, sensitivity analysis (SA) is performed as part of model verification and validation. Oftentimes, however, it is inadequately addressed, partly because of the lack of tools and techniques that focus on an explicit evaluation of ABM dynamics. The nonlinear processes, inherent in such models, necessitate longitudinal SA with time path investigation of input-output relationships of endogenous variables. In response to the outlined deficiencies, this study investigates the potential of time-dependent global sensitivity analysis (time-GSA) in examining the dynamics of outcome uncertainty of a simple ABM of land use change. Specifically, we apply first and total order sensitivity indices to decompose variance of output landscape fragmentation, apportioned to model inputs for multiple time steps and multiple realizations of the ABM. We focus the analysis on selected complex systems characteristics including preference uncertainty, path dependence, access to information, and magnitude of interactions and feedbacks. We conclude that the factor sensitivity measures vary significantly during model execution. Consequently, a static snapshot of ABM sensitivity, taken at the end of the simulation, is inadequate when deciding on factor prioritization and reduction. Assuming that ABM dynamics is a result of factor interaction, we observe a distinct time lag of nonlinearity, which unfolds after the formation of the seeds of development. Therefore, we argue for further application of time-GSA in ABM as one of the visual quantitative techniques contributing to evaluation of ABM nonlinearity. Numéro de notice : A2010-552 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658816.2010.490533 En ligne : https://doi.org/10.1080/13658816.2010.490533 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30744
in International journal of geographical information science IJGIS > vol 24 n°11-12 (december 2010) . - pp 1829 - 1850[article]Exemplaires(2)
Code-barres Cote Support Localisation Section Disponibilité 079-2010071 RAB Revue Centre de documentation En réserve L003 Disponible 079-2010072 RAB Revue Centre de documentation En réserve L003 Disponible
Titre : User-friendly web mapping : lessons from a citizen science website Type de document : Article/Communication Auteurs : G. Newman, Auteur ; D. Zimmerman, Auteur ; A. Crall, Auteur ; et al., Auteur Année de publication : 2010 Article en page(s) : pp 1851 - 1869 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique web
[Termes IGN] convivialité
[Termes IGN] données localisées des bénévoles
[Termes IGN] participation du public
[Termes IGN] production participative
[Termes IGN] qualité des données
[Termes IGN] science citoyenne
[Termes IGN] SIG participatif
[Termes IGN] utilisateur
[Termes IGN] web mapping
[Termes IGN] WebSIGRésumé : (Auteur) Citizen science websites are emerging as a common way for volunteers to collect and report geographic ecological data. Engaging the public in citizen science is challenging and, when involving online participation, data entry, and map use, becomes even more daunting. Given these new challenges, citizen science websites must be easy to use, result in positive overall satisfaction for many different users, support many different tasks, and ensure data quality. To begin reaching these goals, we built a geospatially enabled citizen science website, evaluated its usability, and gained experience by working with and listening to citizens using the website. We sought to determine general perceptions, discover potential problems, and iteratively improve website features. Although the website was rated positively overall, map-based tasks identified a wide range of problems. Given our results, we redesigned the website, improved the content, enhanced the ease of use, simplified the map interface, and added features. We discuss citizen science websites in relation to online Public Participation Geographic Information Systems, examine the role(s) websites may play in the citizen science research model, discuss how citizen science research advances GIScience, and offer guidelines to improve citizen-based web mapping applications. Numéro de notice : A2010-553 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/SOCIETE NUMERIQUE Nature : Article DOI : 10.1080/13658816.2010.490532 En ligne : https://doi.org/10.1080/13658816.2010.490532 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30745
in International journal of geographical information science IJGIS > vol 24 n°11-12 (december 2010) . - pp 1851 - 1869[article]Exemplaires(2)
Code-barres Cote Support Localisation Section Disponibilité 079-2010071 RAB Revue Centre de documentation En réserve L003 Disponible 079-2010072 RAB Revue Centre de documentation En réserve L003 Disponible
Titre : Area aggregation in map generalisation by mixed-integer programming Type de document : Article/Communication Auteurs : Jan‐Henrik Haunert, Auteur ; A. Wolff, Auteur Année de publication : 2010 Article en page(s) : pp 1871 - 1897 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] agrégation de données
[Termes IGN] analyse combinatoire (maths)
[Termes IGN] base de données ATKIS
[Termes IGN] base de données topographiques
[Termes IGN] distance
[Termes IGN] généralisation cartographique automatisée
[Termes IGN] graphe
[Termes IGN] jeu de données localisées
[Termes IGN] méthode heuristique
[Termes IGN] optimisation (mathématiques)
[Termes IGN] programmation par contraintes
[Termes IGN] rédaction cartographique
[Termes IGN] sémiologie graphique
[Vedettes matières IGN] GénéralisationRésumé : (Auteur) Topographic databases normally contain areas of different land cover classes, commonly defining a planar partition, that is, gaps and overlaps are not allowed. When reducing the scale of such a database, some areas become too small for representation and need to be aggregated. This unintentionally but unavoidably results in changes of classes. In this article we present an optimisation method for the aggregation problem. This method aims to minimise changes of classes and to create compact shapes, subject to hard constraints ensuring aggregates of sufficient size for the target scale. To quantify class changes we apply a semantic distance measure. We give a graph theoretical problem formulation and prove that the problem is NP-hard, meaning that we cannot hope to find an efficient algorithm. Instead, we present a solution by mixed-integer programming that can be used to optimally solve small instances with existing optimisation software. In order to process large datasets, we introduce specialised heuristics that allow certain variables to be eliminated in advance and a problem instance to be decomposed into independent sub-instances. We tested our method for a dataset of the official German topographic database ATKIS with input scale 1:50,000 and output scale 1:250,000. For small instances, we compare results of this approach with optimal solutions that were obtained without heuristics. We compare results for large instances with those of an existing iterative algorithm and an alternative optimisation approach by simulated annealing. These tests allow us to conclude that, with the defined heuristics, our optimisation method yields high-quality results for large datasets in modest time. Numéro de notice : A2010-554 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810903401008 En ligne : https://doi.org/10.1080/13658810903401008 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30746
in International journal of geographical information science IJGIS > vol 24 n°11-12 (december 2010) . - pp 1871 - 1897[article]Exemplaires(2)
Code-barres Cote Support Localisation Section Disponibilité 079-2010071 RAB Revue Centre de documentation En réserve L003 Disponible 079-2010072 RAB Revue Centre de documentation En réserve L003 Disponible
