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Visual clutter reduction in zoomable proportional point symbol maps / Tomasz Opach in Cartography and Geographic Information Science, Vol 46 n° 4 (July 2019)  

Public [article]  inCartography and Geographic Information Science > Vol 46 n° 4 (July 2019) . - pp. 347 - 367 Titre : Visual clutter reduction in zoomable proportional point symbol maps Type de document : Article/Communication Auteurs : Tomasz Opach, Auteur ; Jolanta Korycka-Skorupa, Auteur ; Izabela Karsznia, Auteur ; et al., Auteur Année de publication : 2019 Article en page(s) : pp. 347 - 367 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Cartographie numérique [Termes descripteurs IGN] approche holistique [Termes descripteurs IGN] carte cognitive [Termes descripteurs IGN] etude empirique [Termes descripteurs IGN] figuré ponctuel [Termes descripteurs IGN] fouillis d'échos [Termes descripteurs IGN] modèle analytique [Termes descripteurs IGN] précision cartographique [Termes descripteurs IGN] test statistique Résumé : (auteur) Proportional point symbols are commonly used in map displays. However, when such displays are zoomed out, the available map space shrinks and consequently symbols overlap and the display suffers from visual clutter. Therefore, solutions are needed to reduce visual clutter in zoomable map displays that contain proportional point symbols. The authors add to the body of knowledge through the investigation of the performance of three solutions: aggregation of unit areas, the displacement of overlapping symbols, and modified symbolization; four variations of modified symbolization are examined in detail. The original study begins with a consideration of the strengths and weaknesses of the solutions, with an emphasis on information loss. Thereafter, user sessions with 165 participants are arranged to gain empirical evidence of the performance of the solutions. The results reveal that although participants zoom out the map to zoom levels that implement visual clutter reduction techniques, they tend to zoom in the map and pan it to examine specific areas. Moreover, they willingly use the map with aggregated unit areas in cases when the solution facilitates task accomplishment. A certain amount of skepticism attaches to the solution that displaces overlapping symbols. Numéro de notice : A2019-202 Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/15230406.2018.1490202 date de publication en ligne : 10/07/2018 En ligne : https://doi.org/10.1080/15230406.2018.1490202 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=92661 [article]

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Star and polyline glyphs in a grid plot and on a map display: which perform better? / Tomasz Opach in Cartography and Geographic Information Science, Vol 45 n° 5 (August 2018)  

Public [article]  inCartography and Geographic Information Science > Vol 45 n° 5 (August 2018) . - pp 400 - 419 Titre : Star and polyline glyphs in a grid plot and on a map display: which perform better? Type de document : Article/Communication Auteurs : Tomasz Opach, Auteur ; Stanislav Popelka, Auteur ; Jitka Dolezalova, Auteur ; Jan Ketil Rød, Auteur Année de publication : 2018 Article en page(s) : pp 400 - 419 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Rédaction cartographique [Termes descripteurs IGN] oculométrie [Termes descripteurs IGN] symbole graphique [Termes descripteurs IGN] utilisateur [Termes descripteurs IGN] variable visuelle Résumé : (Auteur) Glyphs are small geometric shapes that in geovisualization are often used to represent multidimensional spatial data. The aim of this study is to investigate the effectiveness of their two types – star and polyline glyphs, as they can encode the same message and can provide similar functionality. Thus, if the two glyph types are similar and can be used for the same data, the question arises as to which of them better facilitates various user tasks. To address this question, an empirical study of 26 individual users is conducted to investigate differences in user performance for polyline and star glyphs shown either in a grid plot or on a map display. In this study, a task-based approach with eye-tracking is applied, as well as a subjective questionnaire and a psychological test of cognitive style. The finding is that polyline glyphs better facilitate tasks when datapoint values in glyphs are to be read, whereas star glyphs are better when a visual search among glyphs is to be done. Moreover, the results reveal that the map display works better than the grid plot. If star glyphs are to be used, the key (legend) needs to be better incorporated into a visual interface. Numéro de notice : A2018-510 Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/15230406.2017.1364169 date de publication en ligne : 29/08/2017 En ligne : https://doi.org/10.1080/15230406.2017.1364169 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=90334 [article]

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For your eyes only? Evaluating a coordinated and multiple views tool with a map, a parallel coordinated plot and a table using an eye-tracking approach / Izabela Golebiowska in International journal of geographical information science IJGIS, vol 31 n° 1-2 (January - February 2017)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 31 n° 1-2 (January - February 2017) . - pp 237 - 252 Titre : For your eyes only? Evaluating a coordinated and multiple views tool with a map, a parallel coordinated plot and a table using an eye-tracking approach Type de document : Article/Communication Auteurs : Izabela Golebiowska, Auteur ; Tomasz Opach, Auteur ; Jan Ketil Rød, Auteur Année de publication : 2017 Article en page(s) : pp 237 - 252 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes descripteurs IGN] logiciel de visualisation [Termes descripteurs IGN] oculométrie [Termes descripteurs IGN] visualisation cartographique [Termes descripteurs IGN] visualisation de données [Vedettes matières IGN] Géovisualisation Résumé : (auteur) Geographic visualization tools with coordinated and multiple views (CMV) typically provide sets of visualization methods. Such configuration gives users the possibility of investigating data in various visual contexts; however, it can be confusing due to the multiplicity of visual components and interactive functions. We addressed this challenge and conducted an empirical study on how a CMV tool, consisting of a map, a parallel coordinate plot (PCP), and a table, is used to acquire information. We combined a task-based approach with eye-tracking and usability metrics since these methods provide comprehensive insights into users’ behaviour. Our empirical study revealed that the freedom to choose visualization components is appreciated by users. The individuals worked with all the available visualization methods and they often used more than one visualization method when executing tasks. Different views were used in different ways by various individuals, but in a similarly effective way. Even PCP, which is claimed to be problematic, was found to be a handy way of exploring data when accompanied by interactive functions. Numéro de notice : A2017-032 Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/13658816.2016.1191636 En ligne : http://dx.doi.org/10.1080/13658816.2016.1191636 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=84025 [article]

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Cartographic visualization of vulnerability to natural hazards / Tomasz Opach in Cartographica, vol 48 n° 2 (June 2013)  

Public [article]  inCartographica > vol 48 n° 2 (June 2013) . - pp 113 - 125 Titre : Cartographic visualization of vulnerability to natural hazards Type de document : Article/Communication Auteurs : Tomasz Opach, Auteur ; Jan Ketil Rød, Auteur Congrès : ICC 2013, 26th International Cartographic Conference ICA (25 - 30 août 2013; Dresde, Allemagne), Commanditaire Année de publication : 2013 Article en page(s) : pp 113 - 125 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique web [Termes descripteurs IGN] carte interactive [Termes descripteurs IGN] changement climatique [Termes descripteurs IGN] information sémantique [Termes descripteurs IGN] Norvège [Termes descripteurs IGN] risque naturel [Termes descripteurs IGN] visualisation cartographique [Termes descripteurs IGN] vulnérabilité [Termes descripteurs IGN] zone à risque Résumé : (Auteur) Vulnerability to natural hazards has many components. It is about exposure to various natural disasters, but a place's vulnerability also depends on its capacity to prepare for, respond to, and recover from shocks resulting from natural extreme events. To avoid increased place vulnerability due to the anticipated negative effects of climate change, local authorities need to know which places are the most vulnerable and what makes these areas vulnerable. We have developed ViewExposed to provide this information. Knowing where the most vulnerable areas are is very useful for local stakeholders, since these places may be most in need of adaptation strategies. However, stakeholders also need to have an understanding of what makes these areas vulnerable. ViewExposed provides this information using a parallel coordinates plot, a table view, sparklines, and a profile report. Although vulnerability assessment data are complex, ViewExposed has an easy-to-use interface facilitating a high degree of user interaction through multiple and linked views. An improved understanding of the many aspects of vulnerability has a far-reaching potential to inform users efficiently about factors that influence the overall vulnerability and, as a consequence, can help raise people's awareness of what makes places vulnerable to natural threats. Numéro de notice : A2013-404 Thématique : GEOMATIQUE Nature : Article En ligne : http://www.utpjournals.press/doi/full/10.3138/carto.48.2.1840 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32542 [article]

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