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La généralisation avance à petits pas / Françoise de Blomac in SIG la lettre, n° 46 (avril 2003)
[article]
Titre : La généralisation avance à petits pas Type de document : Article/Communication Auteurs : Françoise de Blomac, Auteur Année de publication : 2003 Article en page(s) : pp 2 - 6 Langues : Français (fre) Descripteur : [Termes IGN] déplacement d'objet géographique
[Termes IGN] généralisation cartographique automatisée
[Termes IGN] lisibilité perceptive
[Termes IGN] qualité cartographique
[Termes IGN] représentation multiple
[Termes IGN] réseau routier
[Termes IGN] système multi-agents
[Vedettes matières IGN] GénéralisationRésumé : (Documentaliste) Processus complexe, la généralisation permet de créer des cartes à partir de données à plus grande échelle, en effectuant des opérations diverses de simplification, de sélection, d'agrégation des objets géographiques. Afin d'automatiser ce processus, les chercheurs ont développé des algorithmes qui ne répondent qu'à certaines contraintes. les recherches s'orientent davantage aujourd'hui vers "l'orchestration des algorithmes". Plusieurs pistes sont étudiées : la hiérarchisation des agents (projet Agent), le dialogue entre agents qui détermine leurs modifications, les éléments structurants de l'espace, ... et se pose ensuite la question de l'évaluation de la généralisation. Les industriels sont frileux pour développer des produits de généralisation, même si quelques uns offrent des modules de généralisation, qui gère certaines actions. Les travaux sur la représentation multi-échelle ouvrent un nouveau champ d'exploration. Numéro de notice : A2003-054 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22350
in SIG la lettre > n° 46 (avril 2003) . - pp 2 - 6[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 286-03041 RAB Revue Centre de documentation En réserve L003 Disponible Multiresolution compression and visualization of global topographic data / T. Gerstner in Geoinformatica, vol 7 n° 1 (March - May 2003)
[article]
Titre : Multiresolution compression and visualization of global topographic data Type de document : Article/Communication Auteurs : T. Gerstner, Auteur Année de publication : 2003 Article en page(s) : pp 7 - 32 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Cartographie numérique
[Termes IGN] arbre-B
[Termes IGN] compression de données
[Termes IGN] données topographiques
[Termes IGN] modèle numérique de terrain
[Termes IGN] représentation multiple
[Termes IGN] Triangulated Irregular Network
[Termes IGN] visualisationRésumé : (Auteur) We present a multiresolution model for terrain surfaces which is able to handle large-scale global topographic. It is based on a hierarchical decomposition of the sphere by a recursive bisection triangulation in geographic coordinates. Error indicators allow the representation of the data at various levels of detail and enable data compression by local omission of data values. The resulting adaptive hierarchical triangulation is stored using a bit code of the underlying binary tree and additionally, relative pointers which allow a selective tree traversal. This way, it is possible to work directly on the compressed data. We show that significant compression rates can be obtained already for small threshold values. In a visualization application, adaptive triangulations which consist of hundreds of thousands of shaded triangles are extracted and drawn at interactive rates. Numéro de notice : A2003-059 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1023/A:1022818126783 En ligne : https://doi.org/10.1023/A:1022818126783 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22355
in Geoinformatica > vol 7 n° 1 (March - May 2003) . - pp 7 - 32[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 057-03011 RAB Revue Centre de documentation En réserve L003 Disponible
Titre : 3D image models in a dynamic environmental GIS Type de document : Article/Communication Auteurs : Eva Savina Malinverni, Auteur ; F. Di Gioia, Auteur Editeur : International Society for Photogrammetry and Remote Sensing ISPRS Année de publication : 2003 Collection : International Archives of Photogrammetry and Remote Sensing, ISSN 0252-8231 num. 34-5/W10 Conférence : ISPRS 2003, WG V/6 International Workshop Visualization and animation of reality-based 3D Models 24/02/2003 27/02/2003 Tarasp-Vulpera Suisse OA proceedings Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique
[Termes IGN] aménagement du territoire
[Termes IGN] base de données cartographiques
[Termes IGN] cartographie numérique
[Termes IGN] modèle numérique de terrain
[Termes IGN] orthoimage
[Termes IGN] représentation multiple
[Termes IGN] SIG dynamique
[Termes IGN] système d'information environnementale
[Termes IGN] visualisation 3DIndex. décimale : 33.30 Photogrammétrie numérique Résumé : (Auteur) The modem digital cartography, represented by numerical cartography, digital elevation models (DEM, DTM, DSM), orthoimages or the same like photo textured on DEM, is the metrically correct and highly descriptive system on which integrate any other source of information. These three-dimensional models in dynamic GIS can provide an interesting tool for the environmental and territorial data management. Aim of this research is to set up procedures for generating a three-dimensional map with maximum characteristics of description and the best accuracy, in order to be over the bidimensional GIS mapping system. DTMs, orthoimages and their 3D models overlay are performed by softwares dedicated to digital photogrammetry (ER Mapper, Surfer) and CAD designs (3dStudio Max, AutoCAD 2000). Successively these representations have been elaborated within the GIS system for a series of different themes and queries, which can be of a great support for a decision system. The use of geographic computerised system is fundamental to acquire, manage and revise all sort of information. This work shows how to create a complete, as far as the cartography is concerned, threedimensional database within the GIS system. Digital sensor derived images, or digitalised images, remote sensing acquired, or any other spatial referred qualitative or quantitative data can be used as data for the application of new methodologies and new procedures for the cartographical elaborations and their representations. Their final products, or the intermediate ones, are easily managed by very well and worldwide known systems, such as the GIS one. Numéro de notice : 15075 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Communication DOI : sans En ligne : https://www.isprs.org/proceedings/XXXIV/5-W10/papers/malinver.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=64386 Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 15075-01 33.30 Tiré à part Centre de documentation Photogrammétrie - Lasergrammétrie Disponible
Titre : Automated aggregation of geographic objects : a new approach to the conceptual generalisation of geographic databases Type de document : Thèse/HDR Auteurs : J.W.N. van Smaalen, Auteur Editeur : Delft : Netherlands Geodetic Commission NGC Année de publication : 2003 Collection : Netherlands Geodetic Commission Publications on Geodesy, ISSN 0165-1706 num. 55 Importance : 94 p. Format : 17 x 24 cm ISBN/ISSN/EAN : 978-90-6132-282-5 Note générale : Bibliographie
doctoral dissertationLangues : Anglais (eng) Descripteur : [Termes IGN] agrégation de données
[Termes IGN] base de données localisées
[Termes IGN] généralisation cartographique automatisée
[Termes IGN] généralisation de base de données
[Termes IGN] implémentation (informatique)
[Termes IGN] modèle (conceptuel) de généralisation
[Termes IGN] modèle conceptuel de données
[Termes IGN] modèle topologique de données
[Termes IGN] relation spatiale
[Termes IGN] représentation multiple
[Vedettes matières IGN] GénéralisationRésumé : (Auteur) Since the late 1960's automated methods for map generalisation have been studied, but thus far no comprehensive system has been achieved. This is due to the general complexity of the matter, part of which is caused by the inability to separate the conceptual and the graphic issues. These aspects of map generalisation are considered separate issues ever since the advent of GIS but in practice it has been difficult to disconnect the conceptual issues from the impediments of graphic representation, either in the form of a paper map or on a computer screen. Current research into automated map generalisation generally appears to be in a cul-de-sac for this reason.
This study therefore aims to concentrate on strictly non-graphic operations and large generalisation steps, i.e. big scale changes. Whereas most existing methods work towards a clear end result, this approach does not. Instead, it is entirely based on the input data. Minimizing generalisation errors is a priority and assessment of the generalisation results is also an issue to consider. The goal is to develop a system for the generalisation of object-and vector-based categorical maps, such as large-scale topographic data, that is to a large extent automated and can be operated by non-expert users. In the past, several generalisation procedures have been developed for individual objects and dichotomous maps, but the number of procedures for categorical maps is still limited and the methods that do exist rely on similarity and importance factors that are hard to determine.
Large-scale categorical data mostly form an area partition, i.e. the whole spatial extent of the dataset is covered by objects and the objects do not overlap. This implies that objects cannot simply be removed - since this would cause 'holes' -but have to be combined or aggregated.
Objects can be aggregated based on taxonomy or partonomy relationships. Taxonomy relationships are based on similarity between the objects or classes. Aggregation based on taxonomy relationships has been described extensively in map generalisation literature, but only works within a limited spatial range. Since this study is aimed at large-scale changes it is based on the much less described partonomy relationships. Inter-object and inter-class relationships are used to determine functionally related classes in order to aggregate the object instances of the class. It is assumed that spatial correlations indicate functional relationships. The class adjacency index is used as a measure of spatial correlation between classes. Combinations of classes with a high class adjacency index are likely candidates for the creation of composite classes. Adjacent objects of these classes can subsequently be aggregated and reclassified to create composite objects.
The class adjacency index is determined based on adjacency measures of the member objects. The input dataset must therefore form a topologically correct, object-based area partition. The implementation is based on a stored adjacency graph and uses regular relational database management software. The data model is object-based and supports the concept of composite objects. In the process a multiple representations dataset is produced by connecting the composite objects created in every aggregation cycle to the constituent parts in the previous level.
The process can be fully automated but it is also possible to allow user interaction at several points in the process without compromising the approach. Since it is entirely based on characteristics of the input dataset, the method is also suited for exploratory purposes. To a certain degree, the meaning of the classes is not even relevant, although in interactive mode the user naturally has to be aware of the classes.
The method was applied to two Dutch topographic datasets: TOP10 vector and GBKN. The results show that this is a very promising method for conceptual generalisation. The concept of composite classes makes that generalisation errors are not an issue. Therefore, it cannot be evaluated using conventional generalisation effect measures. The output of the aggregation process is not readily suitable for mapping purposes, and additional cartographic generalisation is in that case required. The current implementation is not intended as a complete solution for conceptual generalisation. But since it is set in an environment of other conceptual generalisation operations, such as structural generalisation and extended adjacency graphs, it can be extended to create such a comprehensive system.Note de contenu : Chapter 1 : Introduction
Chapter 2 : Related literature
Chapter 3 : Conceptual data model
Chapter 4 : Abstraction process
Chapter 5 : Datasets
Chapter 6 : Implementation
Chapter 7 : Results and discussion
Chapter 8 : Conclusions and recommendationsNuméro de notice : 15084 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Thèse étrangère Note de thèse : PhD thesis : Geo-information : Wageningen University : 2003 DOI : sans En ligne : https://www.ncgeo.nl/downloads/55VanSmaalen.pdf Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=55057 Exemplaires(3)
Code-barres Cote Support Localisation Section Disponibilité 15084-02 37.10 Livre Centre de documentation Géomatique Disponible 15084-01 37.10 Livre Centre de documentation Géomatique Disponible 15084-03 37.10 Livre Centre de documentation Géomatique Disponible
contenu dans Workshop on progress in automated map generalization, IGN, St Mandé (Paris), France, 28 - 30 April 2003 / Commission on map generalization ICA (2003)
Titre : Coordinative agents for automated generalisation of rural areas Type de document : Article/Communication Auteurs : Cécile Duchêne , Auteur Editeur : International Cartographic Association ICA - Association cartographique internationale ACI Année de publication : 2003 Conférence : ICA 2003, 7th workshop commission on Progress in automated map generalisation 28/04/2003 30/04/2003 Paris France OA Proceedings Importance : 8 p. Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] base de données topographiques
[Termes IGN] généralisation cartographique automatisée
[Termes IGN] objet géographique
[Termes IGN] représentation multiple
[Termes IGN] système multi-agents
[Termes IGN] zone rurale
[Vedettes matières IGN] GénéralisationRésumé : (Auteur) We work on automating the generalisation of topographic databases, in order to produce topographic maps. We use an agent-oriented approach: the geographic features (roads, rivers, buildings etc.) are modelled as autonomous agents, as it has previously been done within the European AGENT project. To handle rural areas, our approach then consists in letting these agents interact so that each of them either finds its new place and geometric representation or eliminates itself, so that the whole fits to the generalisation specifications. For that, our agents are provided with capacities of perception of their spatial environment, as well as capacities of dialoguing with the surrounding agents. This approach has been implemented and tested on real subsets of data. In this paper we describe the system. Some encouraging results are also presented and discussed. Numéro de notice : C2003-026 Affiliation des auteurs : COGIT (1988-2011) Thématique : GEOMATIQUE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : sans En ligne : https://kartographie.geo.tu-dresden.de/downloads/ica-gen/workshop2003/duchene_v1 [...] Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=65005 Etude de l'évolution des mécanismes d'échange de données vectorielles dans le contexte Défense / V. Donato (2003)PermalinkIntégration de bases de données spatiales / A. Cleach (2003)PermalinkMise en place et développement d'une base de données de renseignement de terrain (BDRT) à l'aide de l'outil ArcGis d'ESRI / V. Duault (2003)PermalinkSpatial databases integration : interpretation of multiple representations by using machine learning techniques / David Sheeren (2003)PermalinkVers la représentation multiple : le projet Murmur / Sandrine Balley in Bulletin d'information de l'Institut géographique national, n° 73 (septembre 2002)PermalinkAnalyse descriptive multi-échelle de la structure d'un paysage : application à la mosaïque d'occupation du sol d'un territoire agricole dans le bocage breton / Nicolas Schermann in Revue internationale de géomatique, vol 12 n° 2 (juin - août 2002)PermalinkL'appariement pour la constitution de bases de données géographiques multirésolutions. Vers une interprétation des différences de représentation / David Sheeren in Revue internationale de géomatique, vol 12 n° 2 (juin - août 2002)Permalink6èmes Journées Cassini 2002, Presqu'Ile de Crozon, Finistère, France, 19-20 septembre 2002 / François Cuq (2002)PermalinkL'appariement pour la constitution de bases de données géographiques multi-résolutions / David Sheeren (2002)PermalinkPermalink