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A back-propagation neural network-based approach for multi-represented feature matching in update propagation / Yanxia Wang in Transactions in GIS, vol 19 n° 6 (December 2015)  

Public [article]  inTransactions in GIS > vol 19 n° 6 (December 2015) . - pp 964 – 993 Titre : A back-propagation neural network-based approach for multi-represented feature matching in update propagation Type de document : Article/Communication Auteurs : Yanxia Wang, Auteur ; Deng Chen, Auteur ; Zhiyuan Zhao, Auteur ; et al., Auteur Année de publication : 2015 Article en page(s) : pp 964 – 993 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées [Termes descripteurs IGN] appariement de données localisées [Termes descripteurs IGN] apprentissage automatique [Termes descripteurs IGN] Chine [Termes descripteurs IGN] mise à jour de base de données [Termes descripteurs IGN] objet géographique zonal [Termes descripteurs IGN] pondération [Termes descripteurs IGN] représentation multiple [Termes descripteurs IGN] réseau neuronal artificiel Résumé : (auteur) Spatial data infrastructures, which are characterized by multi-represented datasets, are prevalent throughout the world. The multi-represented datasets contain different representations for identical real-world entities. Therefore, update propagation is useful and required for maintaining multi-represented datasets. The key to update propagation is the detection of identical features in different datasets that represent corresponding real-world entities and the detection of changes in updated datasets. Using polygon features of settlements as examples, this article addresses these key problems and proposes an approach for multi-represented feature matching based on spatial similarity and a back-propagation neural network (BPNN). Although this approach only utilizes the measures of distance, area, direction and length, it dynamically and objectively determines the weight of each measure through intelligent learning; in contrast, traditional approaches determine weight using expertise. Therefore, the weight may be variable in different data contexts but not for different levels of expertise. This approach can be applied not only to one-to-one matching but also to one-to-many and many-to-many matching. Experiments are designed using two different approaches and four datasets that encompass an area in China. The goals are to demonstrate the weight differences in different data contexts and to measure the performance of the BPNN-based feature matching approach. Numéro de notice : A2015--077 Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern En ligne : http://dx.doi.org/10.1111/tgis.12138 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=81352 [article]

Dynamic styling for thematic mapping / Simon Moncrieff (2015) 

Public contenu dans FOSS4G, Seoul 2015, Free and open source software for geospatial conference, September 14 - 19, 2015, Seoul, Korea / Sanghee Shin (2015)     Titre : Dynamic styling for thematic mapping Type de document : Article/Communication Auteurs : Simon Moncrieff, Auteur ; Elizabeth-Kate Gulland, Auteur Congrès : FOSS4G 2015, International conference, Free and open source software for geospatial conference (14 - 19 septembre 2015; Séoul, Corée du Sud), Auteur Editeur : [s.l.] : [s.n.] Année de publication : 2015 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes descripteurs IGN] architecture REST [Termes descripteurs IGN] carte thématique [Termes descripteurs IGN] cartographie à la volée [Termes descripteurs IGN] cartographie dynamique [Termes descripteurs IGN] démonstration de faisabilité [Termes descripteurs IGN] objet cartographique [Termes descripteurs IGN] objet géographique ponctuel [Termes descripteurs IGN] objet géographique zonal [Termes descripteurs IGN] prototype [Termes descripteurs IGN] service web géographique [Termes descripteurs IGN] style cartographique [Termes descripteurs IGN] Styled Layer Descriptor [Vedettes matières IGN] Géovisualisation Résumé : (auteur) Current web standards have facilitated the online production and publication of thematic maps as a useful aid to interpretation of spatial data and decision making. Patterns within the raw data can be highlighted with careful styling choices, which can be defined for online maps using tools such as Styled Layer Descriptor (SLD) XML schema. Dynamic generation of maps and map styles extends their use beyond static publication and into exploration of data which may require multiple styles and visualisations for the same set of data. This paper explores the application of thematic styling options to online data, including mapping services such as Open Geospatial Consortium (OGC)-compliant Web Mapping and Web Feature Services. In order to be relevant for both user-specified and automated styling, a prototype online service was developed to explore the generation of styling schema when given data records plus the required output data type and styling parameters. Style choices were applied on-the-fly and to inform the styling characteristics of non-spatial visualisations. A stand-alone web service to produce styling definitions requires a mechanism, such as a RESTful interface, to specify its own capabilities, accept style parameters, and produce schema. The experiments in this paper are an investigation into the requirements and possibilities for such a system. Styles were applied using point and polygon feature data as well as spatially-contextual records (for example, data that includes postal codes or suburb names but no geographical feature definitions). Functionality was demonstrated by accessing it from an online geovisualisation and analysis system. This exploration was carried out as a proof of concept for generation of a map styling web service that could be used to implement automated or manual design choices. Numéro de notice : C2015-045 Thématique : GEOMATIQUE Nature : Communication Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=83775

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Modeling 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)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 24 n°11-12 (december 2010) . - pp 1649 - 1686 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 descripteurs IGN] analyse multiéchelle [Termes descripteurs IGN] attribut [Termes descripteurs IGN] facteur d'échelle [Termes descripteurs IGN] généralisation cartographique automatisée [Termes descripteurs IGN] graphe [Termes descripteurs IGN] objet géographique linéaire [Termes descripteurs IGN] objet géographique zonal [Termes descripteurs IGN] relation topologique Résumé : (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 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 [article]

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Automatic creation of extents for forest names / Ghislaine Convers (2010)

Public Titre : Automatic creation of extents for forest names Type de document : Mémoire Auteurs : Ghislaine Convers, Auteur Editeur : Paris : Université de Paris 1 Panthéon Sorbonne Année de publication : 2010 Importance : 66 p. Format : 21 x 30 cm Note générale : Bibliographie Internship report, Master 2 Carthagéo professionnel Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées [Termes descripteurs IGN] Clarity [Termes descripteurs IGN] environnement de développement [Termes descripteurs IGN] état de l'art [Termes descripteurs IGN] forêt [Termes descripteurs IGN] généralisation automatique de données [Termes descripteurs IGN] imprécision des données [Termes descripteurs IGN] limite indéterminée [Termes descripteurs IGN] objet géographique zonal Index. décimale : DCAR Mémoires de DESS cartographie et Master CARTHAGEO Résumé : (Auteur) Un projet de recherche de 5 mois réalisé au sein d'Ordnance Survey a permis d'étudier une méthodologie afin de créer une étendue pour les noms de forêts. Le projet a commencé par un état de l'art afin de comprendre les principaux concepts et définitions en jeu. Puis une enquête avec des cartographes et experts a permis de déterminer les principales pistes à suivre. La méthodologie fut implémentée avec le langage Java sur la plateforme Radius Clarity (ISpatial) sur la zone d'étude de la New Forest, au Sud de l'Angleterre. Les algorithmes ont été développés en utilisant les outils de topologie. Malgré des imperfections et limites dans les données en entrée, les premiers résultats apportent une meilleure définition de l'étendue des forêts nommées. Note de contenu : INTRODUCTION 1. CONTEXT OF THE INTERNSHIP: THE RESEARCH DEPARTMENT OF THE NATIONAL MAPPING AGENCY OF GREAT BRITAIN 1.1. General Context: Ordnance Survey 1.1.1. History of the Ordnance Survey 1.1.2. The main Ordnance Survey Products 1.1.3. The Research Department 1.1.4. The Computer Science expert pool 1.2. Presentation of the project: automatic creation of extents for a forest names 1.2.1. Presentation of the context: the Ordnance Survey maps and databases 1.2.2. The objectives of the internship: produce a methodology and implement it 1.2.3. Presentation of the plan and the steps of the project (Pert and Gantt) 2. STATE OF THE ART: WHAT IS A FOREST? 2.1. Definitions of forest 2.1.1. Different definitions of forest 2.1.2. Definitions used by Ordnance Survey 2.1.3. Research generalisation of forest 2.2. Definitions of Vagueness 2.2.1. Definition of boundaries 2.2.2. Concept and theories of vagueness 2.3. Presentation of input data 2.3.1. The named point instances 2.3.2. The named extent features 2.3.3. The Landcover woodlands 2.3.4. Non wooded topographic features 2.4. Case studied: presentation of the New Forest 2.4.1. History of the New Forest 2.4.2. Vegetation of the New Forest 3. DEVELOPMENT OF THE METHODOLOGY AND IMPLEMENTATION 3.1. The Survey in order to understand Ordnance Survey point of view 3.1.1. Objectives of the survey 3.1.2. Preparation of the maps for the survey 3.1.3. Conducting the survey 3.1.4. Results of the survey 3.2. The methodology 3.2.1. Development of the methodology 3.2.2. Implementation in Java language 4. EVALUATION OF RESULTS 4.1. Results 4.2. Evaluation 4.2.1. Conducting the evaluation 4.2.2. Results of the evaluation 4.3. Outlooks and improvements 4.3.1. Problems and limits 4.3.2. Improvements CONCLUSION Numéro de notice : 10964 Thématique : FORET/GEOMATIQUE/INFORMATIQUE Nature : Mémoire master cartographie Note de thèse : mémoire de master : Cartographie : Paris 1, Paris 7 : 2010 Organisme de stage : Ordnance Survey Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=49461

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Generalization approaches for car navigation systems / A. Dogru (15/11/2009)

Public Titre : Generalization approaches for car navigation systems Type de document : Article/Communication Auteurs : A. Dogru, Auteur ; Cécile Duchêne , Auteur ; N. Van De Weghe, Auteur ; N. Ulugtekin, Auteur ; Sébastien Mustière , Auteur Congrès : ICC 2009, 24th International Cartographic Conference ICA (15 - 21 novembre 2009; Santiago, Chili), Auteur Année de publication : 15/11/2009 Importance : 10 p. Format : 21 X 30 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes descripteurs IGN] arbre (mathématique) [Termes descripteurs IGN] carrefour [Termes descripteurs IGN] conception cartographique [Termes descripteurs IGN] généralisation cartographique automatisée [Termes descripteurs IGN] Géoxygène (plateforme de généralisation) [Termes descripteurs IGN] instrument embarqué [Termes descripteurs IGN] matrice [Termes descripteurs IGN] navigation automobile [Termes descripteurs IGN] objet géographique linéaire [Termes descripteurs IGN] objet géographique zonal [Termes descripteurs IGN] réseau routier [Vedettes matières IGN] Généralisation Résumé : (Auteur) In this study, the main theories, which were proposed in a PhD study completed at the Cartography Division of Istanbul Technical University, were presented. This study aimed to develop new approaches for covering the generalization based map design deficiencies of car navigation systems currently in use. For this purpose, commercial car navigation products were examined depending on the technologies that they used for map design. Optimization of the road network data and determination of the land use information of areal data were considered as the problems to be solved in this study and a route dependant generalization process was proposed to add value of current car navigation systems. This approach covered generalization processes applied on both areal and linear objects for optimizing the data presented at detailed level. Another approach, which determines the geometries of the road network interchanges and classifies them automatically, was also presented in this paper. This classification approach aimed to formalize interchanges efficiently to generalize them depending on the aim of the application. Two different methods that define interchanges mathematically were used in this context. Interchanges were defined as matrices and tree structures depending on the requirements of the navigating user in these methods. Numéro de notice : 13916 Thématique : GEOMATIQUE/INFORMATIQUE Nature : Communication Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=64299

Introducing scale parameters for adjusting area objects in GIS based on least squares and variance component estimation / X. Tong in International journal of geographical information science IJGIS, vol 23 n°11-12 (november 2009)

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Event-based topology for dynamic planar areal objects / J. Jiang in International journal of geographical information science IJGIS, vol 23 n° 1-2 (january 2009)

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Extracting composite cartographic area features in low-quality maps / S. Leyk in Cartography and Geographic Information Science, vol 36 n° 1 (January 2009)

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Road junction extraction from high-resolution aerial imagery / M. Ravanbakhsh in Photogrammetric record, vol 23 n° 124 (December 2008 - February 2009)  

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A framework of region-based spatial relations for non-overlapping features and its application in object based image analysis / Y. Liu in ISPRS Journal of photogrammetry and remote sensing, vol 63 n° 4 (July - August 2008)

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An analysis of urban spatial structure using comprehensive prominence of irregular areas / C. Zhang in International journal of geographical information science IJGIS, vol 22 n° 6-7 (june 2008)

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Understanding spatiotemporel patterns: visual ordening of space and time / Menno-Jan Kraak in Cartographica, vol 42 n° 2 (June 2007)  

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Effect of generalization on area features: a comparative study of two strategies / T. Cheng in Cartographic journal (the), vol 43 n° 2 (July 2006)

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Toward quantitative measures for the semantic quality of polygon generalization / T. Cheng in Cartographica, vol 41 n° 2 (June 2006)

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Extraction semi-automatique de bâtiments par contours actifs surfaciques : adaptation au contexte Pléiades / P. Cornic in Revue Française de Photogrammétrie et de Télédétection, n° 180 (Décembre 2005)

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