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The design and composition of persuasive maps / Ian Muehlenhaus in Cartography and Geographic Information Science, vol 40 n° 5 (November 2013)  

Public [article]  inCartography and Geographic Information Science > vol 40 n° 5 (November 2013) . - pp 401 - 414 Titre : The design and composition of persuasive maps Type de document : Article/Communication Auteurs : Ian Muehlenhaus, Auteur Année de publication : 2013 Article en page(s) : pp 401 - 414 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] analyse de données [Termes IGN] carte thématique [Termes IGN] communication cartographique [Termes IGN] conception cartographique [Termes IGN] style cartographique [Vedettes matières IGN] Cartologie Résumé : (Auteur) Persuasive maps are ubiquitous in society, yet cartographers have largely neglected to conduct serious, holistic research on them. Persuasive maps represent a form of visual communication that differs markedly from scientific geovisualization. First, many of these maps' communicative goals are anathema to those of scientific representation. Second, many persuasive maps ignore and defy established cartographic conventions. This article argues two things. First, the cartographic discipline can gain insight about how maps communicate information from the longitudinal and holistic analysis of persuasive maps. By comparing the differences and similarities of persuasive maps to scientific geovisualizations, researchers can begin to understand how persuasive maps communicate differently than scientific ones. Second, breaking persuasive maps down into composite parts may make it possible to identify persuasive map norms (i.e., methods of design that are embraced by producers of persuasive maps). The results of a content analysis of 256 persuasive maps are discussed. The article concludes that it may be possible to take the most statistically significant results from this study to begin identifying different rhetorical styles of persuasive maps. Numéro de notice : A2013-763 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/15230406.2013.783450 En ligne : https://doi.org/10.1080/15230406.2013.783450 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32899 [article]

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Scale-specific automated line simplification by vertex clustering on a hexagonal tessellation / Paulo Raposo in Cartography and Geographic Information Science, vol 40 n° 5 (November 2013)  

Public [article]  inCartography and Geographic Information Science > vol 40 n° 5 (November 2013) . - pp 427 - 443 Titre : Scale-specific automated line simplification by vertex clustering on a hexagonal tessellation Type de document : Article/Communication Auteurs : Paulo Raposo, Auteur Année de publication : 2013 Article en page(s) : pp 427 - 443 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées [Termes IGN] analyse de groupement [Termes IGN] distance de Hausdorff [Termes IGN] généralisation cartographique automatisée [Termes IGN] noeud [Termes IGN] simplification de contour [Termes IGN] tessellation Résumé : (Auteur) A new method of cartographic line simplification is presented. Regular hexagonal tessellations are used to sample lines for simplification, where hexagon width, reflecting sampling fidelity, is varied in proportion to target scale and drawing resolution. Tesserae constitute loci at which new sets of vertices are defined by vertex clustering quantization, and these vertices are used to compose simplified lines retaining only visually resolvable detail at target scale. Hexagon scaling is informed by the Nyquist–Shannon sampling theorem. The hexagonal quantization algorithm is also compared to an implementation of the Li–Openshaw raster-vector algorithm, which undertakes a similar process using square raster cells. Lines produced by either algorithm using like tessera widths are compared for fidelity to the original line in two ways: Hausdorff distances to the original lines are statistically analyzed, and simplified lines are presented against input lines for visual inspection. Results show that hexagonal quantization offers advantages over square tessellations for vertex clustering line simplification in that simplified lines are significantly less displaced from input lines. Visual inspection suggests lines produced by hexagonal quantization retain informative geographical shapes for greater differences in scale than do those produced by quantization in square cells. This study yields a scale-specific cartographic line simplification algorithm, following Li and Openshaw's natural principle, which is readily applicable to cartographic linework. Open-source Java code implementing the hexagonal quantization algorithm is available online. Numéro de notice : A2013-764 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1080/15230406.2013.803707 En ligne : https://doi.org/10.1080/15230406.2013.803707 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32900 [article]

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A method to generalize stream flowlines in small-scale maps by a variable flow-based pruning threshold / Michael Tinker in Cartography and Geographic Information Science, vol 40 n° 5 (November 2013)  

Public [article]  inCartography and Geographic Information Science > vol 40 n° 5 (November 2013) . - pp 444 - 457 Titre : A method to generalize stream flowlines in small-scale maps by a variable flow-based pruning threshold Type de document : Article/Communication Auteurs : Michael Tinker, Auteur ; Peter Anthamatten, Auteur ; Jeff Simley, Auteur ; Michael P. Finn, Auteur Année de publication : 2013 Article en page(s) : pp 444 - 457 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées [Termes IGN] courant fluvial [Termes IGN] débit [Termes IGN] données hydrographiques [Termes IGN] Etats-Unis [Termes IGN] généralisation cartographique automatisée [Termes IGN] hydrographie de surface [Termes IGN] précipitation [Termes IGN] régression [Termes IGN] représentation cartographique [Termes IGN] seuillage Résumé : (Auteur) The aim of this paper is to explore and describe a method of automated generalization designed to produce a map which strikes a balance between cartographic and hydrologic representations. Following a discussion of scholarly literature on generalization, we describe a novel method for automated generalization of hydrographic stream data, using the National Hydrography Data Set (NHDPlus) as an example. Traditional hydrography shows a fairly uniform density of stream flowlines over space. While this is pleasing to the eye, traditional methods tend to under-represent rivers in humid areas and over-represent them in arid areas. We address this problem through a method in automated generalization to produce a high-quality presentation of hydrographic data, suitable for display as a wall map or in an atlas. Streams are pruned based on a variable flow threshold, derived from the local mean annual precipitation by a regression equation. After running the model using different parameters, we produce a more satisfactory portrayal of stream networks in the United States that communicates the flow of water through rivers and reflects the regional climate. Specific advantages in generalizing with variable flow threshold include (1) the method allows for fine gradations in output scale; (2) the output maps tend to minimize density variations in the raw data; (3) the subjective criteria are easily derived; and (4) the method can be performed rapidly on large data sets, as long as the stream data has been enriched with reliable flow rates. Numéro de notice : A2013-765 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1080/15230406.2013.801701 En ligne : https://doi.org/10.1080/15230406.2013.801701 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32901 [article]

Exemplaires(1)

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Symbol stores: sharing maps symbol for emergency management / Anthony C. Robinson in Cartography and Geographic Information Science, vol 40 n° 5 (November 2013)  

Public [article]  inCartography and Geographic Information Science > vol 40 n° 5 (November 2013) . - pp 415 - 426 Titre : Symbol stores: sharing maps symbol for emergency management Type de document : Article/Communication Auteurs : Anthony C. Robinson, Auteur ; Scott Pezanowski, Auteur ; Sarah Troedson, Auteur ; et al., Auteur Année de publication : 2013 Article en page(s) : pp 415 - 426 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Rédaction cartographique [Termes IGN] cartographie d'urgence [Termes IGN] communication cartographique [Termes IGN] partage de données localisées [Termes IGN] signe conventionnel [Termes IGN] symbole graphique Résumé : (auteur) Maps are a primary means for supporting information sharing and collaboration in emergency management and crisis situations. While a variety of formalized map symbol standards for emergency contexts exist, they have not been widely adopted by mapmakers. Informal symbol conventions are commonly used within emergency management stakeholder groups, but until now there has not been a flexible mechanism for discovering, sharing, and previewing these symbol sets among mapmakers. In this paper, we describe the design and development of the Symbol Store, a visually enabled, web-based interactive tool intended to help mapmakers share point symbols. The Symbol Store allows users to browse symbols by keyword, category tags, and contributors. It also allows for symbols to be previewed on realistic maps prior to download. An initial prototype of the Symbol Store was evaluated by flood mapping experts from the State of California, and the results of this user study led to multiple refinements now implemented in the public version of Symbol Store located at www.symbolstore.org. Numéro de notice : A2013-785 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/15230406.2013.803833 En ligne : https://doi.org/10.1080/15230406.2013.803833 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=76132 [article]

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The lay of the language: Surveying the cartographic characteristic of the language maps / Candice R. Luebbering in Cartography and Geographic Information Science, vol 40 n° 5 (November 2013)  

Public [article]  inCartography and Geographic Information Science > vol 40 n° 5 (November 2013) . - pp 383 - 400 Titre : The lay of the language: Surveying the cartographic characteristic of the language maps Type de document : Article/Communication Auteurs : Candice R. Luebbering, Auteur ; Korine N. Kolivras, Auteur ; Stephen P. Prisley, Auteur Année de publication : 2013 Article en page(s) : pp 383 - 400 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Rédaction cartographique [Termes IGN] cartologie [Termes IGN] langage cartographique [Termes IGN] style cartographique [Termes IGN] surveillance [Termes IGN] symbole graphique Résumé : (auteur) Although visible in research in the 1980s and 1990s, works concerning language-mapping issues are recently rather absent. This is an unfortunate oversight given current GIS capability and its potential to tackle visualization issues that were previously simply acknowledged and accepted. Given that there are no established guidelines for language map construction, this work aims to renew attention to language mapping, beginning with a survey documenting the characteristics of published language maps. The survey components address the problematic aspects described in the literature, such as boundary representation and depicting linguistic diversity, and reveal their usage and frequency. The noted map characteristics include, but are not limited to: publication type, publication year, coverage area, language data or variable used, and symbology details. For consistent classification, we use a language-map symbology classification scheme found in previous research. In general, chorochromatic maps using polygonal map units dominate our survey. We also find further evidence supporting the problems outlined in language mapping literature with the widespread use of solid-line boundaries and depiction of only one language or feature per place. However, we also note some unique strategies used for handling uncertainty and linguistic plurality. Observations of tactics not captured by the existing 20-year-old typology lead us to create an updated language map symbology typology consistent with the trends observed in our survey. Overall, we document language mapping strategies in practice and provide direction for future research by highlighting the pros and cons of current cartographic approaches for depicting language. Numéro de notice : A2013-786 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/15230406.2013.809892 En ligne : https://doi.org/10.1080/15230406.2013.809892 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=76133 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
032-2013051	RAB	Revue	Centre de documentation	En réserve L003	Disponible