Cartography and Geographic Information Science / Cartography and geographic information society . vol 30 n° 1Paru le : 01/01/2003 ISBN/ISSN/EAN : 1523-0406 |
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Code-barres | Cote | Support | Localisation | Section | Disponibilité |
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032-03011 | RAB | Revue | Centre de documentation | En réserve L003 | Disponible |
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Ajouter le résultat dans votre panierB-spline functions and wavelets for geographic line generalization / Eric Saux in Cartography and Geographic Information Science, vol 30 n° 1 (January 2003)
[article]
Titre : B-spline functions and wavelets for geographic line generalization Type de document : Article/Communication Auteurs : Eric Saux, Auteur Année de publication : 2003 Article en page(s) : pp 33 - 50 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] B-Spline
[Termes IGN] données multiéchelles
[Termes IGN] généralisation cartographique automatisée
[Termes IGN] lissage de courbe
[Termes IGN] objet géographique linéaire
[Termes IGN] ondelette
[Termes IGN] polyligne
[Vedettes matières IGN] GénéralisationRésumé : (Auteur) Most line processing algorithms developed so far in cartographic generalization focus on polygonal curves (or polylines). This representation model is sometimes not sufficient for certain processes due to its lack of continuity or smoothness. Indeed, it may provide poor résults for lines having "smooth" initial shapes such as roads. Thus, we suggest using a modeling method based on B-spline curves. A maritime case study described in this paper shows that this representation provides good results at a fixed scale and is suitable for several automatic line cartographic generalization operators (smoothing, displacement, aggregation and compression). Lastly, we discuss the application of B-spline wavelets used in dealing with multiscaling. Numéro de notice : A2003-051 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1559/152304003100010938 En ligne : https://doi.org/10.1559/152304003100010938 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22347
in Cartography and Geographic Information Science > vol 30 n° 1 (January 2003) . - pp 33 - 50[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 032-03011 RAB Revue Centre de documentation En réserve L003 Disponible Representation of generalized map series using semi-structured data models / Emmanuel Stefanakis in Cartography and Geographic Information Science, vol 30 n° 1 (January 2003)
[article]
Titre : Representation of generalized map series using semi-structured data models Type de document : Article/Communication Auteurs : Emmanuel Stefanakis, Auteur Année de publication : 2003 Article en page(s) : pp 51 - 68 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Cartographie numérique
[Termes IGN] cartographie par internet
[Termes IGN] échange de données informatisé
[Termes IGN] généralisation cartographique automatisée
[Termes IGN] langage de requête
[Termes IGN] modèle conceptuel de données localisées
[Termes IGN] représentation cartographiqueRésumé : (Auteur) Large cartographic organizations worldwide produce generalized map series (GMS) in order to meet varions user requirements. A GMS consists of maps of the same geographic region at different scales. Most of these maps currently are designed in a digital environment, and recently some of them have been distributed through the web. One important issue is the appropriate modelling and handling of cartographic entities composing individual maps in a GMS. Since these entities have rather complex descriptions and may be provided by varions agencies, they usually do not conform to a fixed schema (i.e., they do not have a common structure). Hence, their representation in traditional data models, such as the relational or object-oriented, is not always feasible. This paper investigates the use of semi-structured data (SSD) models, an innovative approach recently developed in Information Technology for representing and handling entities in a GMS. Specifically, the Object Exchange Model (OEM), a popular database model for SSD, has been adopted to represent a GMS. How useful information can be extracted from such a representation using the LOREL query language, a popular language for SSD is also shown. Numéro de notice : A2003-052 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1559/152304003100010947 En ligne : https://doi.org/10.1559/152304003100010947 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22348
in Cartography and Geographic Information Science > vol 30 n° 1 (January 2003) . - pp 51 - 68[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 032-03011 RAB Revue Centre de documentation En réserve L003 Disponible Projecting global datasets to achieve equal areas / E. Lynn Usery in Cartography and Geographic Information Science, vol 30 n° 1 (January 2003)
[article]
Titre : Projecting global datasets to achieve equal areas Type de document : Article/Communication Auteurs : E. Lynn Usery, Auteur ; M.P. Finn, Auteur ; et al., Auteur Année de publication : 2003 Article en page(s) : pp 69 - 79 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Cartographie numérique
[Termes IGN] analyse comparative
[Termes IGN] coordonnées planes
[Termes IGN] coordonnées sphériques
[Termes IGN] données localisées numériques
[Termes IGN] données maillées
[Termes IGN] projectionRésumé : (Auteur) Scientists routinely accomplish global modeling in the raster domain, but recent research has indicated that the transformation of large areas through map projection equations leads to errors. This research attempts to gauge the extent of map projection and resampling effects on the tabulation of categorical areas by comparing the results of three datasets for seven common projections. The datasets, Global Land Cover, Holdridge Life Zones, and Global Vegetation, were compiled at resolutions of 30 arcsecond, 1/2 degree, and 1 degree, respectively. These datasets were projected globally from spherical coordinates to plane representations. Results indicate significant problems in the implementation of global projection transformations in commercial software, as well as differences in areal accuracy across projections. The level of raster resolution directly affects the accuracy of areal tabulations, with higher resolution yielding higher accuracy. If the raster resolution is high enough for individual pixels to approximate points, the areal error tends to zero. The 30arcsecond cells appear to approximate this condition. Numéro de notice : A2003-053 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1559/152304003100010956 En ligne : https://doi.org/10.1559/152304003100010956 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22349
in Cartography and Geographic Information Science > vol 30 n° 1 (January 2003) . - pp 69 - 79[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 032-03011 RAB Revue Centre de documentation En réserve L003 Disponible