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Swiss-style colour relief shading modulated by elevation and by exposure to illumination / Bernhard Jenny in Cartographic journal (the), vol 43 n° 3 (December 2006)  

Public [article]  inCartographic journal (the) > vol 43 n° 3 (December 2006) . - pp 198 - 207 Titre : Swiss-style colour relief shading modulated by elevation and by exposure to illumination Type de document : Article/Communication Auteurs : Bernhard Jenny, Auteur ; Lorenz Hurni, Auteur Année de publication : 2006 Article en page(s) : pp 198 - 207 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Rédaction cartographique [Termes IGN] carte topographique [Termes IGN] cartographie automatique [Termes IGN] charte de couleurs [Termes IGN] estompage [Termes IGN] histoire de la cartographie [Termes IGN] modèle numérique de surface [Termes IGN] représentation du relief Résumé : (Auteur) Maps with coloured relief shading, modulated by elevation and by exposure to illumination, present topography in a particularly vivid and descriptive manner. Carefully modulated illumination and shading shown in continuous colour tones simulate the third dimension of topography, helping map-readers to conceive more easily the terrain's important landforms. Since the end of the 19th century, cartographers have developed a wide variety of colour schemes. The first part of this paper illustrates the graphical and technical developments of the past, leading to Swiss-style coloured relief shading; the second part presents a new computer-based method for colourizing grey-shaded relief inspired by classic colour schemes. The method uses a colour look-up table and a digital elevation model. The colour look-up table has colours for all combinations of initial grey values and terrain elevations. It is constructed from interactively placed colour reference points. Copyright British Cartographic Society. Numéro de notice : A2006-583 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1179/000870406X158164 En ligne : https://www.tandfonline.com/doi/abs/10.1179/000870406X158164 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28306 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
030-06031	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Measuring map complexity / David Fairbairn in Cartographic journal (the), vol 43 n° 3 (December 2006)  

Public [article]  inCartographic journal (the) > vol 43 n° 3 (December 2006) . - pp 224 - 238 Titre : Measuring map complexity Type de document : Article/Communication Auteurs : David Fairbairn, Auteur Année de publication : 2006 Article en page(s) : pp 224 - 238 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Cartographie numérique [Termes IGN] complexité [Termes IGN] complexité de la carte [Termes IGN] compression de données [Termes IGN] conception cartographique [Termes IGN] données maillées [Termes IGN] données vectorielles [Termes IGN] entropie [Termes IGN] généralisation cartographique [Termes IGN] représentation cartographique [Termes IGN] vision Résumé : (Auteur) In this paper, issues of complexity and their application to cartographic practice and enquiry are addressed. After an initial discussion of the nature of complexity and its fitful study in cartography over recent years, an assessment is made of the potential for quantifying map complexity. A series of practical tests was devised and is described. These consider a wide range of metrics, including spatial statistical measures, entropy and image-based indices. Their application to both raster and vector mapping is investigated. Data compression shows promise as an index which can be used to characterize the graphical variation within the map face. The nature of digital data compression is described, with reference to raster map representations, and it is determined that a data-compression ratio can act as a simple and effective complexity measure. The paper concludes by listing some of the reasons why complexity, as measured by data compression, could be used in cartographic practice. Copyright British Cartographic Society Numéro de notice : A2006-584 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1179/000870406X169883 En ligne : https://www.tandfonline.com/doi/abs/10.1179/000870406X169883 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28307 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
030-06031	RAB	Revue	Centre de documentation	En réserve L003	Disponible