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Empirical studies on the visual perception of spatial patterns in choropleth maps / Jochen Schiewe in KN, Journal of Cartography and Geographic Information, vol 69 n° 3 (September 2019)  

Public [article]  inKN, Journal of Cartography and Geographic Information > vol 69 n° 3 (September 2019) . - pp 217 - 228 Titre : Empirical studies on the visual perception of spatial patterns in choropleth maps Type de document : Article/Communication Auteurs : Jochen Schiewe, Auteur Année de publication : 2019 Article en page(s) : pp 217 - 228 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes descripteurs IGN] analyse de données [Termes descripteurs IGN] carte choroplèthe [Termes descripteurs IGN] couleur (rédaction cartographique) [Termes descripteurs IGN] enquête [Termes descripteurs IGN] erreur systématique [Termes descripteurs IGN] rédaction cartographique [Termes descripteurs IGN] vision [Vedettes matières IGN] Cartologie Résumé : (Auteur) An essential purpose of choropleth maps is the visual perception of spatial patterns (such as the detection of hot spots or extreme values). This requires an effective and as intuitive as possible comparison of color values between different regions. Accordingly, a number of design requirements must be considered. Due to the lack of empirical evidence regarding some elementary design aspects, an online study with 260 participants was conducted. Three closely related effects were examined: the “dark-is-more bias” (i.e., the intuitive ranking of color lightness), the “area-size bias” (i.e., the neglect of small areas, since these are less dominant in perception than larger ones) and the “data-classification effect” (i.e., attention to data classification when interpreting spatial patterns). For each hypothesis, one or more maps in connection with single or multiple choice questions were presented. Users should detect extreme values, central tendencies or homogeneities of values as well as comment on their task solving certainty. In general, the hypotheses regarding the mentioned effects could be confirmed by statistical analysis. The results are used to derive conclusions and topics for future research. In particular, further comparative empirical studies are recommended to determine the best possible map types for given applications, also considering alternatives to choropleth maps. Numéro de notice : A2019-459 Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s42489-019-00026-y date de publication en ligne : 13/08/2019 En ligne : https://doi.org/10.1007/s42489-019-00026-y Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=93550 [article]

Expanding the Sémiologie Graphique for contemporary cartography, some ideas from visual semiotics, art history and design / Laurent Jégou in Cartography and Geographic Information Science, vol 46 n° 2 (March 2019)  

Public [article]  inCartography and Geographic Information Science > vol 46 n° 2 (March 2019) . - pp 182 - 188 Titre : Expanding the Sémiologie Graphique for contemporary cartography, some ideas from visual semiotics, art history and design Type de document : Article/Communication Auteurs : Laurent Jégou, Auteur Année de publication : 2019 Article en page(s) : pp 182 - 188 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes descripteurs IGN] couleur (rédaction cartographique) [Termes descripteurs IGN] esthétique cartographique [Termes descripteurs IGN] sémiologie graphique [Vedettes matières IGN] Géovisualisation Résumé : (Auteur)In this article, we describe some ideas based on Bertin’s Sémiologie Graphique with a focus on extending it for aesthetic quality issues in cartography. We consider research in semiotics, aesthetics, and graphic design, with some fruitful results about the use of color or composition. We present several tools, oriented toward a pedagogical use and accessibility, helping to examine the color composition of an expressing image or to create meaningful gradients. While Bertin’s concepts still remain relevant and efficient, specific ideas can be developed further, to adapt to current media and gain from scientific advances from related disciplines. Numéro de notice : A2019-099 Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/15230406.2018.1513343 date de publication en ligne : 27/09/2018 En ligne : https://doi.org/10.1080/15230406.2018.1513343 Format de la ressource électronique : URL Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=92356 [article]

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Cartographic design and the space–time cube / Irma Kveladze in Cartographic journal (the), Vol 56 n° 1 (February 2019)  

Public [article]  inCartographic journal (the) > Vol 56 n° 1 (February 2019) . - pp 73 - 90 Titre : Cartographic design and the space–time cube Type de document : Article/Communication Auteurs : Irma Kveladze, Auteur ; Menno-Jan Kraak, Auteur ; Corné P.J.M. Van Elzakker, Auteur Année de publication : 2019 Article en page(s) : pp 73 - 90 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes descripteurs IGN] convivialité [Termes descripteurs IGN] couleur (rédaction cartographique) [Termes descripteurs IGN] cube espace-temps [Termes descripteurs IGN] estompage en fonction de l'éloignement [Termes descripteurs IGN] information complexe [Termes descripteurs IGN] oculométrie [Termes descripteurs IGN] taille (variable visuelle) [Termes descripteurs IGN] variable visuelle [Vedettes matières IGN] Géovisualisation Résumé : (Auteur) This paper reports on the results of an empirical evaluation that aimed to define the effectiveness and efficiency of different visual variables in depicting the Space–Time Cube’s (STC) content. Existing STC applications demonstrate that the most used visual variables are size and colour hue. Less is known, however, about their usability metrics. The research sets design criteria for STC contents, such as space–time paths, based on the cartographic design theory. The visual variables colour hue, colour value, colour saturation, size and orientation have been applied in two different use case studies. Besides, to support the three-dimensional visual environment, depth cues such as shading and transparency were considered too. User tests have been executed based on real-world problems with particular attention for the visualization strategy and data complexity. The outcomes revealed the most efficient and effective visual variables to represent data of various complexities in the STC. Numéro de notice : A2019-449 Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/00087041.2018.1495898 date de publication en ligne : 13/12/2018 En ligne : https://doi.org/10.1080/00087041.2018.1495898 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=92796 [article]

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GIS&T Body of Knowledge, 1st Quarter 2019 Edition. Color theory / Sidonie Christophe (2019)  

Public Titre de série : GIS&T Body of Knowledge, 1st Quarter 2019 Edition Titre : Color theory Type de document : Chapitre/Contribution Auteurs : Sidonie Christophe , Auteur Editeur : University consortium for Geographical information science UCGIS Année de publication : 2019 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Rédaction cartographique [Termes descripteurs IGN] conception cartographique [Termes descripteurs IGN] couleur (rédaction cartographique) [Termes descripteurs IGN] couleur à l'écran [Termes descripteurs IGN] couleur imprimée Résumé : (auteur) Color is the result of the visual perception of an energy source. It is described by its physical characteristics, mainly as a tridimensional variable modeled into a color space. Online tools exist to facilitate the use of color schemes to design a color palette, for artists, web designers, statisticians, etc. Colors in maps and visualizations must be combined to promote the visual hierarchy and harmony, balancing legibility, perceptual processing, and aesthetics. Color is a powerful visual variable and requires understanding the perception of color relationships. Existing color schemes are very useful to select a suitable color palette. As color is not experienced similarly across all map readers, issues about real-world connotations, conventions, specific color contrasts, and adaptation to color visual deficiencies and devices, are also to be taken into account when designing a color palette. This entry describes the main guidelines regarding color theory and related design practices as applied to map or geovisualization design. Numéro de notice : H2019-003 Thématique : GEOMATIQUE Nature : Chapître / contribution nature-HAL : ChOuvrScient DOI : 10.22224/gistbok/2019.1.9 date de publication en ligne : 23/03/2019 En ligne : https://doi.org/10.22224/gistbok/2019.1.9 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=95310

Improving the quality of cartographic colour reproduction using the self-organizing map method / Mingguang Wu in Cartographic journal (the), Vol 55 n° 3 (August 2018)  

Public [article]  inCartographic journal (the) > Vol 55 n° 3 (August 2018) . - pp 273 - 284 Titre : Improving the quality of cartographic colour reproduction using the self-organizing map method Type de document : Article/Communication Auteurs : Mingguang Wu, Auteur ; A - Xing Zhu, Auteur ; Li He, Auteur Année de publication : 2018 Article en page(s) : pp 273 - 284 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Cartographie thématique [Termes descripteurs IGN] algorithme [Termes descripteurs IGN] carte de Kohonen [Termes descripteurs IGN] carte thématique [Termes descripteurs IGN] couleur (rédaction cartographique) [Termes descripteurs IGN] couleur imprimée [Termes descripteurs IGN] qualité cartographique [Termes descripteurs IGN] représentation cartographique Résumé : (Auteur) Colour distortion, which is caused by the unavoidable mismatch between a map’s gamut and a device’s gamut, negatively affects the semiotic quality of maps. Cartographic communication often suffers from undesirable colour inconsistency. This method models cartographic colour reproduction as a constrained transform problem, namely, adapting a map’s gamut to fit a device’s gamut while preserving the semiotic quality. First, the characteristics of the map’s gamut are investigated by considering cartographic principles, and the fundamental concerns of preserving semiotic quality are proposed. Then, the self-organizing map method is introduced to iteratively optimize the cartographic colour reproduction. We implement this method and evaluate it based on a series of thematic maps. The results indicate that the proposed algorithm offers better results than two alternatives in terms of facilitating cartographic colour reproduction. Numéro de notice : A2018-519 Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/00087041.2017.1414106 date de publication en ligne : 18/10/2018 En ligne : https://doi.org/10.1080/00087041.2017.1414106 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91325 [article]

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Cartographic continuum rendering based on color and texture interpolation to enhance photo-realism perception / Charlotte Hoarau in ISPRS Journal of photogrammetry and remote sensing, vol 127 (May 2017)  

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The effect of spatial distance on the discriminability of colors in maps / Alžběta Brychtová in Cartography and Geographic Information Science, Vol 44 n° 3 (May 2017)  

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Characterizing maps from visual properties / Catherine Dominguès (2017)  

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Expressive map design: OGC SLD/SE++ extension for expressive map styles / Sidonie Christophe (2017)    

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Personnalisation des représentations cartographiques en géovisualisation : couleurs et styles / Sidonie Christophe (2017)

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Unifying prospects : tinting geological maps in nineteenth-century Britain / Allison Ksiazkiewicz in Cartographica, vol 51 n° 3 (Fall 2016)  

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Assessing the effectiveness and efficiency of map colour for colour impairments using an eye-tracking approach / Weihua Dong in Cartographic journal (the), Vol 53 n° 2 (May 2016)  

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Towards a deeper understanding of cartographic text visualisation : assessment of user preferences and colour influence / Rasha Deeb in Cartographic journal (the), Vol 52 n° 4 (November 2015)

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Discriminating classes of sequential and qualitative colour schemes / Alžběta Brychtová in International journal of cartography, vol 1 n° 1 (August 2015)  

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A perception-based color recommendation algorithm for hierarchical regions / Shipeng Sun in Cartography and Geographic Information Science, Vol 42 n° 3 (July 2015)  

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