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Towards a multiobjective view of cartographic design / N. Xiao in Cartography and Geographic Information Science, vol 39 n° 2 (April 2012)  

Public [article]  inCartography and Geographic Information Science > vol 39 n° 2 (April 2012) . - pp 76 - 87 Titre : Towards a multiobjective view of cartographic design Type de document : Article/Communication Auteurs : N. Xiao, Auteur ; M. Armstrong, Auteur Année de publication : 2012 Article en page(s) : pp 76 - 87 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Cartographie [Termes IGN] cartographie thématique [Termes IGN] conception cartographique [Termes IGN] données localisées libres [Termes IGN] données multisources [Termes IGN] spécification de contenu Résumé : (Auteur) Cartographers must make numerous decisions during the process of constructing a map. In the present era, when spatial data sets are abundant and mapping software is accessible to the general public, cartographic knowledge developed in the literature is under-used and threatened with irrelevance. We view cartographic design as a multiobjective problem solving process that must meet many, often conflicting, goals. The application of this multiobjective view to cartographic design will help a new generation of cartographers develop design capabilities. We illustrate our concepts using several thematic mapping examples. Numéro de notice : A2012-452 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1559/1523040639276 En ligne : https://doi.org/10.1559/1523040639276 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31898 [article]

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Exploration of information: theoretic arguments for the limited amount of information in a map / J. Bjorke in Cartography and Geographic Information Science, vol 39 n° 2 (April 2012)  

Public [article]  inCartography and Geographic Information Science > vol 39 n° 2 (April 2012) . - pp 88 - 97 Titre : Exploration of information: theoretic arguments for the limited amount of information in a map Type de document : Article/Communication Auteurs : J. Bjorke, Auteur Année de publication : 2012 Article en page(s) : pp 88 - 97 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Cartographie [Termes IGN] cartographie par internet [Termes IGN] conception cartographique [Termes IGN] exploration de données [Termes IGN] lisibilité perceptive [Termes IGN] qualité des données [Termes IGN] variable visuelle [Termes IGN] visibilité [Termes IGN] visualisation cartographique Résumé : (Auteur) From the application of information theory capacity limits of maps are derived and some cartographic rules are formulated—based on theoretical models and perception studies. The perception study shows that for a relief map with coloured height intervals the channel capacity, as defined in information theory, is reached at seven~~eight height classes. Generally, the length of a visual variable may be characterized by the channel capacity of the map. This theoretical study shows how increased attention should be paid to perceptual separation as the number of categories increases. The requirement becomes more and more crucial as the number of categories exceeds five. The principle of group visibility is formulated and demonstrated. Group visibility considers the visibility of groups of map features and may be utilized in a visual search for geographical patterns. The quantitative measures presented offers computational methods to control group visibility for example in an interactive visualization system. Numéro de notice : A2012-453 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1559/1523040639288 En ligne : https://doi.org/10.1559/1523040639288 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31899 [article]

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Effectiveness and efficiency of map symbols for dynamic geographic information visualization / Weihua Dong in Cartography and Geographic Information Science, vol 39 n° 2 (April 2012)  

Public [article]  inCartography and Geographic Information Science > vol 39 n° 2 (April 2012) . - pp 98 - 106 Titre : Effectiveness and efficiency of map symbols for dynamic geographic information visualization Type de document : Article/Communication Auteurs : Weihua Dong, Auteur ; J. Ran, Auteur ; Jing Wang, Auteur Année de publication : 2012 Article en page(s) : pp 98 - 106 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique web [Termes IGN] cartographie par internet [Termes IGN] données spatiotemporelles [Termes IGN] écran [Termes IGN] signe conventionnel [Termes IGN] symbole graphique [Termes IGN] visualisation cartographique [Termes IGN] visualisation dynamique Résumé : (Auteur) The quality of dynamic map symbols plays an important role in the representation of spatial-temporal changes. This paper reports an investigation into the quality of dynamic symbols. To assess the quality of such symbols, a set of traffic flow data is used for the production of different kinds of dynamic maps, with focus on four variables, i.e. size, color, frame rate and display format. Two quantitative measures are used for analysis, i.e. deviation and response time. A set of traffic data is used for the production of dynamic maps for evaluation. The experimental results show that the size is more efficient and more effective than color for dynamic maps with the same frame rate and display format. The most efficient and effective color class number is 10 on the large format display such as 1024 * 768 pixels. And the most efficient and effective size class number is 15 on large format display such as 1024 * 768 pixels. The effective frame rate for dynamic map animation is smaller than that of the general animation on the Internet or Quick Time and AVI format video. The most efficient and most effective frame rate is 3 frames per second in the color expression and 6 frames per second in the size expression. In sum, the effective and efficient value of color, size and frame rate on large format display is less than the value on the small format display. These results suggest the frame rate should be reduced on the small format display. It is hoped that the results from this study will be of help in the design of effective and efficient dynamic map symbols for geographical information visualization. Numéro de notice : A2012-454 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1559/1523040639298 En ligne : https://doi.org/10.1559/1523040639298 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31900 [article]

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Spatial knowledge acquisition with mobile maps, augmented reality and voice in the context of GPS-based pedestrian navigation: results from a field test / H. Huang in Cartography and Geographic Information Science, vol 39 n° 2 (April 2012)  

Public [article]  inCartography and Geographic Information Science > vol 39 n° 2 (April 2012) . - pp 107 - 116 Titre : Spatial knowledge acquisition with mobile maps, augmented reality and voice in the context of GPS-based pedestrian navigation: results from a field test Type de document : Article/Communication Auteurs : H. Huang, Auteur ; M. Schmidt, Auteur ; Georg Gartner, Auteur Année de publication : 2012 Article en page(s) : pp 107 - 116 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique web [Termes IGN] acquisition de connaissances [Termes IGN] analyse comparative [Termes IGN] appareil portable [Termes IGN] interface mobile [Termes IGN] interface web [Termes IGN] navigation pédestre [Termes IGN] positionnement par GPS [Termes IGN] réalité augmentée [Termes IGN] système de navigation [Termes IGN] utilisateur nomade [Termes IGN] voix Résumé : (Auteur) GPS-based pedestrian navigation systems have become increasingly popular. Different interface technologies can be used to communicate/convey route directions to pedestrians. This paper aims to empirically study the influence of different interface technologies on spatial knowledge acquisition in the context of GPS-based pedestrian navigation. A field experiment was implemented to address this concern. Firstly, the suitability of the evaluation methods in assessing spatial knowledge acquisition was analyzed empirically (focusing on the ability of differentiating “familiar“ and “unfamiliar“ participants). The suitable methods were then used to compare the influence of mobile maps, augmented reality, and voice on spatial learning. The field test showed that in terms of spatial knowledge acquisition, the three interface technologies led to comparable results, which were not significantly different from each other. The results bring some challenging issues for consideration when designing mobile pedestrian navigation systems. Numéro de notice : A2012-455 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1559/15230406392107 En ligne : https://doi.org/10.1559/15230406392107 Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31901 [article]

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