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Unifying prospects : tinting geological maps in nineteenth-century Britain / Allison Ksiazkiewicz in Cartographica, vol 51 n° 3 (Fall 2016)
[article]
Titre : Unifying prospects : tinting geological maps in nineteenth-century Britain Type de document : Article/Communication Auteurs : Allison Ksiazkiewicz, Auteur Année de publication : 2016 Article en page(s) : pp 159 - 174 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Cartographie thématique
[Termes IGN] carte ancienne
[Termes IGN] couleur (rédaction cartographique)
[Termes IGN] dix-neuvième siècle
[Termes IGN] esthétique cartographique
[Termes IGN] géologie
[Termes IGN] minéralogie
[Termes IGN] représentation cartographiqueRésumé : (Auteur) Geologically interested savants of the late eighteenth and early nineteenth centuries described three-dimensional spatial relationships through the visual language of maps and sections of the Earth. At this time, there was a debate whether colour or line should feature in mapping our strata. Colour was an identifying characteristic of Wernerian mineralogy, but the exact manner in which colour should be employed in representing a mineralogical landscape remained controversial. According to the engineer and geologist William Smith (1769–1839), words or symbols, engraved on a map, marred a visual simplicity that accommodated an immediate understanding of the area represented. Colour enabled a quick and rational study of the countryside so that the savant instantly visualized the logic of the landscape. André-Jean-Marie Brochant de Villiers (1792–1857), professor of geology and mineralogy at École des Mines, argued differently. In a letter to Thomas Webster (1773–1844), he remarked on the difficulty of correlating colours in the key with those of strata when studying Greenough's Map of England and Wales (1819). By examining techniques of representation and the use of colour, this paper discusses the importance of aesthetics in the depiction of geological landscape. Numéro de notice : A2016-729 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.3138/cart.51.3.3569 En ligne : http://dx.doi.org/10.3138/cart.51.3.3569 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=82273
in Cartographica > vol 51 n° 3 (Fall 2016) . - pp 159 - 174[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 031-2016031 RAB Revue Centre de documentation En réserve L003 Disponible An immune genetic algorithm to buildings displacement in cartographic generalization / Yageng Sun in Transactions in GIS, vol 20 n° 4 (August 2016)
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Titre : An immune genetic algorithm to buildings displacement in cartographic generalization Type de document : Article/Communication Auteurs : Yageng Sun, Auteur ; Qingsheng Guo, Auteur ; Yuangang Liu, Auteur ; et al., Auteur Année de publication : 2016 Article en page(s) : pp 585 - 612 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] algorithme génétique
[Termes IGN] bâtiment
[Termes IGN] contrainte géométrique
[Termes IGN] contrainte relationnelle
[Termes IGN] déplacement d'objet géographique
[Termes IGN] généralisation automatique de données
[Termes IGN] généralisation cartographique
[Vedettes matières IGN] GénéralisationRésumé : (auteur) Spatial conflicts may occur when map data are displayed at a scale smaller than that of the source map. This study applies the displacement operator in cartographic generalization to resolve such spatial conflicts and to improve the clarity and legibility of map. The immune genetic algorithm (IGA) is used in this study for buildings displacement to solve conflicts. IGA is based on the genetic algorithm (GA) and employs the self-adjusting mechanism of antibody concentration to enhance population diversity. Meanwhile, the elitism retention strategy is adopted in IGA to guarantee that the best individual (antibody) is not lost and destroyed in the next generation to strengthen convergence efficiency. The compared experiment between IGA and GA shows that the displacement result produced by IGA performs better than GA. Finally, in order to make the displaced map more attractive to cartographers, two constraints – the building alignment constraint and building tangent relation constraint – are applied in IGA to restrict the buildings’ displacement. The same experimental data are adopted to prove that the improved IGA is useful for maintaining the two constraints. Numéro de notice : A2016--053 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/tgis.12165 En ligne : http://dx.doi.org/10.1111/tgis.12165 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=83771
in Transactions in GIS > vol 20 n° 4 (August 2016) . - pp 585 - 612[article]Building displacement based on the topological structure / Yageng Sun in Cartographic journal (the), Vol 53 n° 3 (August 2016)
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Titre : Building displacement based on the topological structure Type de document : Article/Communication Auteurs : Yageng Sun, Auteur ; Qingsheng Guo, Auteur ; Yuangang Liu, Auteur ; et al., Auteur Année de publication : 2016 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] algorithme snake
[Termes IGN] déplacement d'objet géographique
[Termes IGN] généralisation automatique de données
[Termes IGN] optimisation (mathématiques)
[Termes IGN] partitionnement
[Termes IGN] pondération
[Termes IGN] relation spatiale
[Termes IGN] triangulation de Delaunay
[Vedettes matières IGN] GénéralisationRésumé : (auteur) Map data at smaller scales than their source can result in spatial conflict, whereby map symbols become too close, or overlaid. Server map generalisation operators may be applied to solve this problem, including displacement. In this paper, we show how an optimisation algorithm, the snake algorithm, was used to displace multiple objects in order to resolve spatial conflicts and maintain important spatial relationships between objects during displacement. Two principles based on the snake algorithm are proposed in this paper. First, the truss structure mirroring spatial proximity relationships between buildings and between building and road is formed based on the weighted proximity graph derived from constrained Delaunay triangulations (CDT) in each map partition. In the weighted proximity graph, each connecting line is determined as a snake and as an element unit to assemble the global stiffness matrix in snake algorithm. Second, a buffer method that calculates force between a building and a road (or other linear features) or between pair of buildings is adopted in the snake algorithm. This avoids the imbalance phenomenon caused by different force calculation methods during the displacement. The feasibility of the approach is demonstrated in obtaining real geographic data. Finally, the results are cartographically usable and in particular, the spatial relationships between objects are preserved. Numéro de notice : A2016-680 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1179/1743277414Y.0000000089 En ligne : http://dx.doi.org/10.1179/1743277414Y.0000000089 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=81937
in Cartographic journal (the) > Vol 53 n° 3 (August 2016)[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 030-2016031 RAB Revue Centre de documentation En réserve L003 Disponible Implications of weighting metrics for line generalization with Visvalingam's algorithm / Mahes Visvalingam in Cartographic journal (the), Vol 53 n° 3 (August 2016)
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Titre : Implications of weighting metrics for line generalization with Visvalingam's algorithm Type de document : Article/Communication Auteurs : Mahes Visvalingam, Auteur ; J.C. Whelan, Auteur Année de publication : 2016 Article en page(s) : pp 253 - 267 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] algorithme de Visvalingam
[Termes IGN] littoral
[Termes IGN] métrique
[Termes IGN] pondération
[Termes IGN] retour d'expérience technique
[Termes IGN] simplification de contour
[Vedettes matières IGN] GénéralisationRésumé : (auteur) Visvalingam's algorithm was designed for caricatural line generalization. A distinction must be made between the algorithm and its operational definition, which includes the metric used to drive it. When the algorithm was first introduced, it was demonstrated using the concept of the effective area of triangles. It was noted that alternative metrics could be used and that the metrics could be weighted, for example to take account of shape. Ordnance Survey (Great Britain) and others are using Visvalingam's algorithm for generalizing coastlines and other natural features, with complex parameter-driven functions to weight the original metric. This paper shows how free software and data were used to scrutinize the implications of one of Matthew Bloch's simple and transparent weighting functions. The results look promising, when compared with manually produced mid and small-scale maps; and encourage further research focussed on weighting functions and related topics, such as self-intersection of lines and model-based generalization. The paper discusses why weights were used in some projects. It comments on their range of applicability and reiterates the original guidance provided for the use of weights. It also demonstrates how weights can undermine the algorithm's capacity to draw caricatures with very few points. The paper provides sufficient background and links to the authors’ test data and to open source software for the benefit of others wishing to undertake research in line generalization using Visvalingam's algorithm. Numéro de notice : A2016-682 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/00087041.2016.1149906 En ligne : http://dx.doi.org/10.1080/00087041.2016.1149906 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=81942
in Cartographic journal (the) > Vol 53 n° 3 (August 2016) . - pp 253 - 267[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 030-2016031 RAB Revue Centre de documentation En réserve L003 Disponible The Visvalingam algorithm: metrics, measures and heuristics / Mahes Visvalingam in Cartographic journal (the), Vol 53 n° 3 (August 2016)
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Titre : The Visvalingam algorithm: metrics, measures and heuristics Type de document : Article/Communication Auteurs : Mahes Visvalingam, Auteur Année de publication : 2016 Article en page(s) : pp 242 - 252 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] algorithme de généralisation
[Termes IGN] algorithme de Visvalingam
[Termes IGN] généralisation cartographique automatisée
[Termes IGN] littoral
[Termes IGN] méthode heuristique
[Termes IGN] métrique
[Vedettes matières IGN] GénéralisationRésumé : (auteur) This paper provides the background necessary for a clear understanding of forthcoming papers relating to the Visvalingam algorithm for line generalization, for example on the testing and usage of its implementations. It distinguishes the algorithm from implementation-specific issues to explain why it is possible to get inconsistent but equally valid output from different implementations. By tracing relevant developments within the now-disbanded Cartographic Information Systems Research Group (CISRG) of the University of Hull, it explains why (a) a partial metric-driven implementation was, and still is, sufficient for many projects but not for others; (b) why the effective area (EA) is a measure derived from a metric; (c) why this measure (EA) may serve as a heuristic indicator for in-line feature segmentation and model-based generalization; (d) how metrics may be combined to change the order of point elimination; and (e) how Tobler's rule-of-thumb is useful for scale-related filtering of EA. The issues discussed in this paper also apply to the use of other metrics. It is hoped that the background and guidance provided in this paper will enable others to participate in further research based on the algorithm. Numéro de notice : A2016-681 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/00087041.2016.1151097 En ligne : http://dx.doi.org/10.1080/00087041.2016.1151097 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=81938
in Cartographic journal (the) > Vol 53 n° 3 (August 2016) . - pp 242 - 252[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 030-2016031 RAB Revue Centre de documentation En réserve L003 Disponible From taxonomies to ontologies: formalizing generalization knowledge for on-demand mapping / Nicholas Gould in Cartography and Geographic Information Science, Vol 43 n° 3 (June 2016)PermalinkLes temps de transport pour délimiter des aires urbaines fonctionnelles ? Une investigation critique à partir de trois métropoles européennes / Marianne Guérois in Belgeo, vol 2016 n° 2 (2016-2)PermalinkAssessing the planimetric accuracy of historical maps (sixteenth to nineteenth centuries): new methods and potential for coastal landscape reconstruction / Iason Jongepier in Cartographic journal (the), Vol 53 n° 2 (May 2016)PermalinkRepresentation and discovery of building patterns: a three-level relational approach / Shihong Du in International journal of geographical information science IJGIS, vol 30 n° 5-6 (May - June 2016)PermalinkDasymetric mapping for an improved modeling of diseases / Gianluca Boo in Géomatique suisse, vol 114 n° 4 (avril 2016)PermalinkAn impressionistic cartographic solution for base map land cover with coarse pixel data / Paulo Raposo in Cartographic perspectives, n° 83 (2016)PermalinkGéo-poppy, un serveur web SIG portable pour le recueil de données terrain / Julien Ancelin in Géomatique expert, n° 109 (mars - avril 2016)PermalinkPhysical 3D map of the Planica Nordic Center, Slovenia: cartographic principles and techniques used with 3D printing / Primož Kete in Cartographica, vol 51 n° 1 (Spring 2016)PermalinkReconstruction automatique d'itinéraires à partir de textes descriptifs / Ludovic Moncla in Cartes & Géomatique, n° 227 (mars - mai 2016)PermalinkThe interaction of landmarks and map alignment in you-are-here maps / Grant McKenzie in Cartographic journal (the), Vol 53 n° 1 (February 2016)Permalink