Centre de documentation
scientifique

Dépouillements

Map generalization with a triangulated data structure / Christopher B. Jones in Cartography and geographic information systems, vol 22 n° 4 (December 1995)  

Public [article]  inCartography and geographic information systems > vol 22 n° 4 (December 1995) . - pp 317 - 331 Titre : Map generalization with a triangulated data structure Type de document : Article/Communication Auteurs : Christopher B. Jones, Auteur ; G.L. Bundy, Auteur ; J. Mark Ware, Auteur Année de publication : 1995 Article en page(s) : pp 317 - 331 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] conflit d'espace [Termes IGN] généralisation cartographique automatisée [Termes IGN] généralisation géométrique (de visualisation) [Termes IGN] intégrité topologique [Termes IGN] objet géographique [Termes IGN] primitive géométrique [Termes IGN] triangulation de Delaunay [Vedettes matières IGN] Généralisation Résumé : (Auteur) Automation of map generalization requires facilities to monitor the spatial relationships and interactions among multiple map objects. An experimental map generalization system has been developed which addresses this issue by representing spatial objects within a simplicial data structure (SDS) based on constrained Delaunay triangulation of the source data. Geometric generalization operators that have been implemented include object exaggeration, collapse, amalgamation, boundary reduction and displacement. The generalization operators exploit a set of primitive SDS functions to determine topological and proximal relationships, measure map objects, apply transformations, and detect and resolve spatial conflicts. Proximal search functions are used for efficient analysis of the structure and dimensions of the intervening spaces between map objects. Because geometric generalization takes place within a fully triangulated representation of the map surface, the presence of overlap conflicts, resulting from individual operators, can be detected due to the introduction of singularities in the triangulation, the structure of which is used to generate displacement vectors to resolve the conflict. Examples of the application of the implemented operators are described and illustrated using large scale topographic map data. Numéro de notice : A1995-003 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1559/152304095782540221 En ligne : https://www.tandfonline.com/doi/abs/10.1559/152304095782540221 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=25733 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
032-95041	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Analysis of urban road networks to support cartographic generalization / William A Mackaness in Cartography and geographic information systems, vol 22 n° 4 (December 1995)  

Public [article]  inCartography and geographic information systems > vol 22 n° 4 (December 1995) . - pp 306 - 316 Titre : Analysis of urban road networks to support cartographic generalization Type de document : Article/Communication Auteurs : William A Mackaness, Auteur Année de publication : 1995 Article en page(s) : pp 306 - 316 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] échelle cartographique [Termes IGN] espace urbain [Termes IGN] généralisation cartographique automatisée [Termes IGN] objet géographique linéaire [Termes IGN] réseau routier [Termes IGN] route [Termes IGN] système expert [Vedettes matières IGN] Généralisation Résumé : (Auteur) When a human cartographer designs a map, the symbols represent objects in a way that attempts to convey geographic process occurring at a given scale. The skill is in abstracting patterns of process and representing them in a context at an appropriate scale. The cartographer conveys the essence of the phenomenon by capturing the essential characteristics of a feature. In order for automated cartographic systems to match this subtlety in design and this ability to characterize, they must have cartometric techniques that enable the same abstraction of pattern to take place; techniques that take into account the phenomenological aspects of features. This article utilizes an algorithm for urban space pattern analysis and illustrates how it can be applied to capture the essence of urban settlement in order to generate objective, intermediate design solutions for the representation of urban settlement at a range of scales. Such an algorithm is considered to be one of a growing set of generalization operators that need to be developed as part of a knowledgebased cartographic expert system. The article begins with a description of a "Iine of sight" pattern analysis algorithm applied to road networks and then demonstrates how the algorithm can be used to derive hierarchies of meaningful patterns-patterns which capture the character and extent of urban areas appropriate to a given scale. The article concludes with a discussion of how such techniques may be utilized for automated cartographic generalization of urban space. Numéro de notice : A1995-004 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1559/152304095782540267 En ligne : https://www.tandfonline.com/doi/abs/10.1559/152304095782540267 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=25734 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
032-95041	RAB	Revue	Centre de documentation	En réserve L003	Disponible

The importance of geometric modeling in linear feature generalization / Corinne Plazanet in Cartography and geographic information systems, vol 22 n° 4 (December 1995)    

Public [article]  inCartography and geographic information systems > vol 22 n° 4 (December 1995) . - pp 291 - 305 Titre : The importance of geometric modeling in linear feature generalization Type de document : Article/Communication Auteurs : Corinne Plazanet , Auteur ; Jean-Georges Affholder , Auteur ; Emmanuel Fritsch , Auteur Année de publication : 1995 Article en page(s) : pp 291 - 305 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] exagération de forme [Termes IGN] généralisation cartographique automatisée [Termes IGN] lissage de courbe [Termes IGN] modèle géométrique [Termes IGN] objet géographique linéaire [Termes IGN] segmentation [Termes IGN] simplification de contour [Vedettes matières IGN] Généralisation Résumé : (Auteur) This paper highlights the importance of modeling the geometry of linear features in order to generalize them and addresses research issues that relate to this problem. Three ongoing research projects and the results obtained so far are presented. The research projects focus on, respectively, a piecewise algebraic representation and associated transformation, a frequential representation and its use, and a hierarchical segmentation and characterization of linear features. These three complementary approaches aim to allow new generalization tools to be devised and the choice of tools for a given feature to be automated. These tools are simplification and smoothing tools, the prominent characteristic of which consists in respecting local and global shapes, and exaggeration and caricaturization tools. Numéro de notice : A1995-005 Affiliation des auteurs : COGIT (1988-2011) Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1559/152304095782540276 Date de publication en ligne : 14/03/2013 En ligne : https://doi.org/10.1559/152304095782540276 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=25735 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
032-95041	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Documents numériques

peut être téléchargé The importance of geometric modeling in linear feature generalization - pdf auteur Adobe Acrobat PDF

Evaluating alternative line simplification strategies for multiple representations of cartographic lines / C. Barber in Cartography and geographic information systems, vol 22 n° 4 (December 1995)  

Public [article]  inCartography and geographic information systems > vol 22 n° 4 (December 1995) . - pp 276 - 290 Titre : Evaluating alternative line simplification strategies for multiple representations of cartographic lines Type de document : Article/Communication Auteurs : C. Barber, Auteur ; R. Cromley, Auteur ; R. Andrle, Auteur Année de publication : 1995 Article en page(s) : pp 276 - 290 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Cartographie numérique [Termes IGN] approche hiérarchique [Termes IGN] généralisation cartographique automatisée [Termes IGN] lissage de courbe [Termes IGN] objet géographique linéaire [Termes IGN] représentation cartographique Résumé : (Auteur) Two basic strategies have been identified for handling multiple representations of line features in digital databases. Either a finite number of scale-dependent representations of cartographic lines can be explicitly stored, or a scale-independent database is generated from which subsequent scale representations can be extracted as needed. These two strategies parallel differences in hierarchical and non-hierarchical line simplification operators. Non-hierarchical line simplification can produce the most geometrically accurate simplification at any scale, while hierarchical operators are often associated with scale-independent databases. In this research, hierarchical and non-hierarchical line simplification operators are evaluated by comparing both the points retained by these different algorithms and the overall quality of the graphic portrayal for sample lines of different complexity and at different scales. Visual inspection of the results did not reveal any discernable difference at any scale for any line. Subsequent numerical analyses shows some differences but overall little geometric quality is lost by using a hierarchical operator as opposed to a non-hierarchical one and given the greater flexibility of scale representations that is possible, hierarchical methods appear to be more satisfactory. Numéro de notice : A1995-006 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1559/152304095782540230 En ligne : https://www.tandfonline.com/doi/abs/10.1559/152304095782540230 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=25736 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
032-95041	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Simplification and generalization of large scale data for roads: a comparison of two filtering algorithms / M. Visvalingam in Cartography and geographic information systems, vol 22 n° 4 (December 1995)  

Public [article]  inCartography and geographic information systems > vol 22 n° 4 (December 1995) . - pp 264 - 275 Titre : Simplification and generalization of large scale data for roads: a comparison of two filtering algorithms Type de document : Article/Communication Auteurs : M. Visvalingam, Auteur ; P.J. Williamson, Auteur Année de publication : 1995 Article en page(s) : pp 264 - 275 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] algorithme de Douglas-Peucker [Termes IGN] algorithme de filtrage [Termes IGN] algorithme de Visvalingam [Termes IGN] analyse comparative [Termes IGN] généralisation cartographique automatisée [Termes IGN] lissage de courbe [Termes IGN] objet géographique linéaire [Termes IGN] photographie à grande échelle [Termes IGN] réseau routier [Termes IGN] route [Termes IGN] segmentation [Vedettes matières IGN] Généralisation Résumé : (Auteur) This paper reports the results of an indepth study which investigated two algorithms for line simplification and caricatural generalization (namely, those developed by Douglas and Peucker, and Visvalingam, respectively) in the context of a wider program of research on scalefree mapping. The use of largescale data for man-designed objects, such as roads, has led to a better understanding of the properties of these algorithms and of their value within the spectrum of scalefree mapping. The Douglas-Peucker algorithm is better at minimal simplification. The large-scale data for roads makes it apparent that Visvalingam's technique is not only capable of removing entire scale-related features, but that it does so in a manner which preserves the shape of retained features. This technique offers some prospects for the construction of scalefree databases since it offers some scope for achieving balanced generalizations of an entire map, consisting of several complex lines. The results also suggest that it may be easier to formulate concepts and strategies for automatic segmentation of inline features using largescale road data and Visvalingam's algorithm. In addition, the abstraction of center lines may be facilitated by the inclusion of additional filtering rules with Visvalingam's algorithm. Numéro de notice : A1995-007 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1559/152304095782540249 En ligne : https://www.tandfonline.com/doi/abs/10.1559/152304095782540249 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=25737 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
032-95041	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Map generalization in the context of digital systems / Robert Weibel in Cartography and geographic information systems, vol 22 n° 4 (December 1995)  

Public [article]  inCartography and geographic information systems > vol 22 n° 4 (December 1995) . - pp 259 - 263 Titre : Map generalization in the context of digital systems Type de document : Article/Communication Auteurs : Robert Weibel, Auteur Année de publication : 1995 Article en page(s) : pp 259 - 263 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] généralisation cartographique automatisée [Vedettes matières IGN] Généralisation Numéro de notice : A1995-008 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1559/152304095782540285 En ligne : https://www.tandfonline.com/doi/abs/10.1559/152304095782540285 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=25738 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
032-95041	RAB	Revue	Centre de documentation	En réserve L003	Disponible