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Point grid map : a new type of thematic map for statistical data associated with geographic points / Mengjie Zhou in Cartography and Geographic Information Science, Vol 44 n° 5 (September 2017)  

Public [article]  inCartography and Geographic Information Science > Vol 44 n° 5 (September 2017) . - pp 374 - 389 Titre : Point grid map : a new type of thematic map for statistical data associated with geographic points Type de document : Article/Communication Auteurs : Mengjie Zhou, Auteur ; Jing Tian, Auteur ; Fuquan Xiong, Auteur ; Rui Wang, Auteur Année de publication : 2017 Article en page(s) : pp 374 - 389 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Cartographie thématique [Termes IGN] cartographie statistique [Termes IGN] diagramme [Termes IGN] données socio-économiques [Termes IGN] grille [Termes IGN] point [Termes IGN] représentation cartographique [Termes IGN] symbole graphique Résumé : (Auteur) Social, economic, and environmental statistical data associated with geographic points are currently globally available in large amounts. When conventional thematic maps, such as proportional symbol maps or point diagram maps, are used to represent these data, the maps appear cluttered if the point data volumes are relatively large or cover a relatively dense region. To overcome these limitations, we propose a new type of thematic map for statistical data associated with geographic points: the point grid map. In a point grid map, an input point data set is transformed into a grid in which each point is represented by a square grid cell of equal size while preserving the relative position of each point, which leads to a clear and uncluttered appearance, and the grid cells can be shaded or patterned with symbols or diagrams according to the attributes of the points. We present an algorithm to construct a point grid map and test it with several simulated and real data sets. Furthermore, we present some variants of the point grid map. Numéro de notice : A2017-447 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/15230406.2016.1160797 En ligne : http://dx.doi.org/10.1080/15230406.2016.1160797 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=86355 [article]

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BinSq : visualizing geographic dot density patterns with gridded maps / Alvin Chua in Cartography and Geographic Information Science, Vol 44 n° 5 (September 2017)  

Public [article]  inCartography and Geographic Information Science > Vol 44 n° 5 (September 2017) . - pp 390 - 409 Titre : BinSq : visualizing geographic dot density patterns with gridded maps Type de document : Article/Communication Auteurs : Alvin Chua, Auteur ; Andrew Vande Moere, Auteur Année de publication : 2017 Article en page(s) : pp 390 - 409 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] carte de répartition par points [Termes IGN] déplacement d'objet géographique [Termes IGN] données localisées [Termes IGN] généralisation cartographique [Termes IGN] grille [Termes IGN] visualisation de données [Vedettes matières IGN] Géovisualisation Résumé : (Auteur) Dot maps have become a popular way to visualize discrete geographic data. Yet, beyond showing how the data are spatially distributed, dot maps are often visually cluttered in terms of consistency, overlap, and representativeness. Existing clutter reduction techniques like jittering, refinement, distortion, and aggregation also address this issue, but do so by arbitrarily displacing dots from their exact location, removing dots from the map, changing the spatial reference of the map, or reducing its level of detail, respectively. We present BinSq, a novel visualization technique to compare variations in dot density patterns without visual clutter. Based on a careful synthesis of existing clutter reduction techniques, BinSq reduces the wide variety of dot density variations on the map to a representative subset of density intervals that are more distinguishable. The subset is derived from a nested binning operation that introduces order and regularity to the map. Thereafter, a dot prioritization operation improves the representativeness of the map by equalizing visible data values to correspond with the actual data. In this paper, we describe the algorithmic implementation of BinSq, explore its parametric design space, and discuss its capabilities in comparison to six existing clutter reduction techniques for dot maps. Numéro de notice : A2017-448 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/15230406.2016.1174623 En ligne : http://dx.doi.org/10.1080/15230406.2016.1174623 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=86357 [article]

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Crowdsourcing a cyclist perspective on suggested recreational paths in real-world networks / Kevin Baker in Cartography and Geographic Information Science, Vol 44 n° 5 (September 2017)  

Public [article]  inCartography and Geographic Information Science > Vol 44 n° 5 (September 2017) . - pp 422 - 435 Titre : Crowdsourcing a cyclist perspective on suggested recreational paths in real-world networks Type de document : Article/Communication Auteurs : Kevin Baker, Auteur ; Kristien Ooms, Auteur ; Steven Verstockt, Auteur ; et al., Auteur Année de publication : 2017 Article en page(s) : pp 422 - 435 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique web [Termes IGN] carte thématique [Termes IGN] chemin le plus court, algorithme du [Termes IGN] cycliste [Termes IGN] données localisées des bénévoles [Termes IGN] géomatique web [Termes IGN] itinéraire [Termes IGN] loisir [Termes IGN] production participative [Termes IGN] trace GPS Résumé : (Auteur) Routing and navigation services for leisure activities are conditioned by special needs and trade-offs. The advent of online communities and large crowdsourced datasets offers opportunities to improve the adoption of a user’s perspective in these suggested paths. This paper focuses on achieving two goals. First, the presented methodology analyses a dataset of 190,610 historical GPS traces to gain insights into the appreciation or attractiveness of each edge in a real-world network for a specific leisure activity (i.e. road cycling). Second, as literature on these leisure activities is still sparse, we want to create a thorough understanding of the activities at hand for future work. An appreciation model is proposed and the spread of this score is analyzed in shortest-path alternatives of popular routing engines for this activity. This analysis successfully discriminates these shortest paths based on the scoring value and three morphological parameters of the path. However, the robustness of the model should be improved to ensure the viability of the proposed approach in future work. More specifically, further research on the local optimality of the route choices will be imperative. Numéro de notice : A2017-449 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/15230406.2016.1192486 En ligne : http://dx.doi.org/10.1080/15230406.2016.1192486 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=86359 [article]

Exemplaires(1)

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An empirical evaluation of three elevation change symbolization methods along routes in bicycle maps / Annina Brügger in Cartography and Geographic Information Science, Vol 44 n° 5 (September 2017)  

Public [article]  inCartography and Geographic Information Science > Vol 44 n° 5 (September 2017) . - pp 436 - 451 Titre : An empirical evaluation of three elevation change symbolization methods along routes in bicycle maps Type de document : Article/Communication Auteurs : Annina Brügger, Auteur ; Sara Irina Fabrikant, Auteur ; Arzu Çöltekin, Auteur Année de publication : 2017 Article en page(s) : pp 436 - 451 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Rédaction cartographique [Termes IGN] bicyclette [Termes IGN] carte thématique [Termes IGN] gradient de pente [Termes IGN] itinéraire [Termes IGN] lecture de carte [Termes IGN] oculométrie [Termes IGN] pente [Termes IGN] sémiologie graphique Résumé : (Auteur) Elevation change is critical for choosing a route when bicycling. We detail an empirical study in which we comparatively evaluated three linear symbolization types (color hue, color-coded arrows, and elevation profiles) to depict elevation change in bicycle maps for two common bicycle route planning tasks: relative height detection and slope identification. Participants performed most accurately with the color-coded arrows for relative height detection tasks, whereas symbolization did not significantly influence map-use performance for slope identification. Participants preferred the elevation profile, in spite of their lowest performance with this method overall. Our rare empirical findings offer much needed new insights into the function and appropriateness of common elevation symbolization methods, specifically to identify elevation change in bicycle route planning tasks in urban areas where map display real estate is already very limited. Numéro de notice : A2017-450 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/15230406.2016.1193766 En ligne : http://dx.doi.org/10.1080/15230406.2016.1193766 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=86361 [article]

Exemplaires(1)

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032-2017051	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Assessing professional benefits of GIS certification / Adam J. Mathews in Cartography and Geographic Information Science, Vol 44 n° 5 (September 2017)  

Public [article]  inCartography and Geographic Information Science > Vol 44 n° 5 (September 2017) . - pp 452 - 462 Titre : Assessing professional benefits of GIS certification Type de document : Article/Communication Auteurs : Adam J. Mathews, Auteur ; Thomas A. Wikle, Auteur Année de publication : 2017 Article en page(s) : pp 452 - 462 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes d'information géographique [Termes IGN] certification [Termes IGN] impact professionnel [Termes IGN] métier [Termes IGN] qualification professionnelle [Termes IGN] questionnaire [Termes IGN] système d'information géographique Résumé : (Auteur) The certification of geographic information system (GIS) professionals remains a contentious topic. After more than 25 years, the GIS community remains divided over the need to formally recognize GIS professionals who maintain standards of professional competency and conduct. Unfortunately, few studies have examined individuals who have become certified or the professional benefits of certification. This study explores GIS certification through a survey of 1731 geospatial professionals who became geographic information systems professionals (GISPs) between 2003 and 2014. A web-based questionnaire asked GISPs about the certification process, its influence on their compensation and advancement, and other issues. Quantitative and qualitative findings suggest that perceptions about certification fall along a wide spectrum with GISPs employed in private industry seeing fewer benefits compared with those employed in government or not-for-profit organizations. While a large number of respondents conveyed pride in completing the certification process, others expressed frustration over the program’s lack of visibility, standards that have enabled less qualified peers to become certified, and the slow progress at which GIS certification has achieved respect compared with programs administered in other fields such as engineering and planning. Numéro de notice : A2017-451 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/15230406.2016.1185742 En ligne : http://dx.doi.org/10.1080/15230406.2016.1185742 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=86364 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
032-2017051	RAB	Revue	Centre de documentation	En réserve L003	Disponible