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Roads, lines, and boundary objects : a critical cartographic look at the development of the Serengeti highway / Eric J. Lovell in Cartographica, vol 52 n° 4 (Winter 2017)  

Public [article]  inCartographica > vol 52 n° 4 (Winter 2017) . - pp 310 - 321 Titre : Roads, lines, and boundary objects : a critical cartographic look at the development of the Serengeti highway Type de document : Article/Communication Auteurs : Eric J. Lovell, Auteur Année de publication : 2017 Article en page(s) : pp 310 - 321 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] autoroute [Termes IGN] frontière [Termes IGN] frontière naturelle [Termes IGN] parc naturel national [Termes IGN] Tanzanie [Termes IGN] tracé routier [Vedettes matières IGN] Cartologie Résumé : (Auteur) In 2010, the then President of Tanzania, Jakaya Kikwete, announced an economic development plan to build a highway that spanned northern Tanzania. The map of the plan revealed a transportation network that traversed the Greater Serengeti–Mara ecosystem and bisected the iconic Serengeti National Park. Given the importance of the Serengeti–Mara ecosystem to conservation and savannah ecology, not to mention international tourism, the plan immediately came under worldwide scrutiny. The Tanzanian state and the Kikwete administration were lambasted, ultimately fixing the highway project in the form of polylines on maps rather than an infrastructure project on the ground. As such, the mutability of lines on maps give the highway project the flexibility to transcend conversations across institutions that span the conservation–development spectrum with limited interrogation. This article addresses the circulation of maps representing the failed highway project through various epistemic communities. My purpose is neither to advocate the development of the Serengeti Highway nor to criticize it. Rather, I use examples of Serengeti Highway maps to discuss the way cartography travels through these conversations, reflect on the international conversation surrounding the Serengeti Highway project, and explore the question of who can (and cannot) draw lines in the contested spaces of East African rangelands. Numéro de notice : A2017-829 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.3138/cart.52.4.2017-0011 En ligne : https://doi.org/10.3138/cart.52.4.2017-0011 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=89363 [article]

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031-2017041	SL	Revue	Centre de documentation	Revues en salle	Disponible

What is so “hot” in heatmap? qualitative code cluster analysis with foursquare venue / Ilyoung Hong in Cartographica, vol 52 n° 4 (Winter 2017)  

Public [article]  inCartographica > vol 52 n° 4 (Winter 2017) . - pp 332 - 348 Titre : What is so “hot” in heatmap? qualitative code cluster analysis with foursquare venue Type de document : Article/Communication Auteurs : Ilyoung Hong, Auteur ; Jin-Kyu Jung, Auteur Année de publication : 2017 Article en page(s) : pp 332 - 348 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] analyse spatiale [Termes IGN] carte de densité de clics [Termes IGN] distribution spatiale [Termes IGN] réseau social géodépendant [Termes IGN] Seattle (Washington) [Vedettes matières IGN] Géovisualisation Résumé : (Auteur) Foursquare is a popular Web service and a representative location-based social network (LBSN) service using position data. Heatmap is a widely used means of geovisualization for analyzing social data with locational values. Until now, heatmap analysis of LBSN has focused on identifying quantitative distribution and patterns, with little consideration of the qualitative analysis of data content. Based on a case study of Foursquare venues and user-created content in Seattle, WA, this study conducts analyses assessing both the quantitative spatial distribution and the qualitative characteristics of coffee shops in the Seattle metropolitan area. It specifically proposes a new analytical method referred to as “code cluster,” which is designed to employ quantitative and qualitative approaches simultaneously. The significance of this method is its capacity to explain geographical differences in terms of qualitative traits in cluster regions, in addition to analyzing their spatial characteristics and distributions. In introducing this new hybrid approach, our aims are to reflect the original intent and essence of the data throughout the research process and to make further efforts to analyze and interpret the contextualized meanings. This will be possible through integration of advanced spatial analysis, geovisualization, and qualitative research that build on current geographic and geovisual research with big data. Numéro de notice : A2017-830 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.3138/cart.52.4.2016-0005 En ligne : https://doi.org/10.3138/cart.52.4.2016-0005 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=89364 [article]

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031-2017041	SL	Revue	Centre de documentation	Revues en salle	Disponible

A simulation and visualization environment for spatiotemporal disaster risk assessments of network infrastructures / Magnus Heittzler in Cartographica, vol 52 n° 4 (Winter 2017)  

Public [article]  inCartographica > vol 52 n° 4 (Winter 2017) . - pp 349 - 363 Titre : A simulation and visualization environment for spatiotemporal disaster risk assessments of network infrastructures Type de document : Article/Communication Auteurs : Magnus Heittzler, Auteur ; Juan Carlos Lam, Auteur ; Jürgen Hackl, Auteur ; Bryan T. Adey, Auteur ; Lorenz Hurni, Auteur Année de publication : 2017 Article en page(s) : pp 349 - 363 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] analyse géovisuelle [Termes IGN] données spatiotemporelles [Termes IGN] environnement de développement [Termes IGN] évaluation [Termes IGN] modèle de simulation [Termes IGN] réseau technique [Termes IGN] risque naturel [Termes IGN] Suisse [Vedettes matières IGN] Géovisualisation Résumé : (Auteur) Emerging methodologies for risk assessments of civil infrastructure networks require the coupling of several spatiotemporal models that need to be executed multiple times with varying parametrizations to account for model uncertainty and to investigate “what-if” scenarios. These requirements led to the development of a software environment to support the simulation process and the visual analysis of its results. The simulation engine component of the environment makes it possible to define, couple, and execute models. An embedded infrastructure model facilitates the development of functionality to estimate and aggregate capacity measures of single objects affected by multiple hazards. The simulation manager component can be used to execute multiple instances of the simulation engine conveniently with varying parametrizations. The included visualization tool provides two complementary views. The ensemble view can be used to analyze the data at a highly aggregated level with information visualization techniques and the simulation view can be used to investigate simulations in greater detail via an interactive map window and a state dependency graph. The software environment is used in a risk assessment for the region of Chur, Switzerland, which comprises the simulation of multiple natural hazard scenarios that lead to impaired transport infrastructure capacities and thus to disrupted traffic flows. Numéro de notice : A2017-831 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.3138/cart.52.4.2017-0009 En ligne : https://doi.org/10.3138/cart.52.4.2017-0009 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=89367 [article]

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031-2017041	SL	Revue	Centre de documentation	Revues en salle	Disponible

An automated displaced proportional circle map using Delaunay triangulation and an algorithm for node overlap removal / David Lamb in Cartographica, vol 52 n° 4 (Winter 2017)  

Public [article]  inCartographica > vol 52 n° 4 (Winter 2017) . - pp 364 - 370 Titre : An automated displaced proportional circle map using Delaunay triangulation and an algorithm for node overlap removal Type de document : Article/Communication Auteurs : David Lamb, Auteur Année de publication : 2017 Article en page(s) : pp 364 - 370 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Cartographie thématique [Termes IGN] cartogramme [Termes IGN] sémiologie graphique [Termes IGN] triangulation de Delaunay Résumé : (Auteur) Proportional circle maps are a popular method for visualizing quantitative data on a map. Circles are scaled proportionally based on the data provided; larger circles represent larger quantities. The circles require two values, a location and a numeric quantity. For data that have a wide range of values, the resulting map will produce clutter and overlap in which large symbols obscure the information contained in smaller circles. Some previous solutions to this problem are modifying and improving the contrast between symbols, or using stacking algorithms so all symbols are visible. This article proposes the displaced proportional symbol map, which displaces the symbol's location based on the amount of overlap between neighbouring circles. At the same time, it preserves the location of non-overlapping symbols, which distinguishes it from the circular cartogram. The displacement is automated through the proximity stress model algorithm for node overlap removal. This algorithm was originally designed for graph layouts with overlapping nodes, but was modified here for circular symbols and map layout. The result is a map with improved clarity and the ability to add labelling to a cluttered proportional circle map. Numéro de notice : A2017-832 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.3138/cart.52.4.2016-0007 En ligne : https://doi.org/10.3138/cart.52.4.2016-0007 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=89368 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
031-2017041	SL	Revue	Centre de documentation	Revues en salle	Disponible