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A geodesic map projection for quadrilaterals / J. Crider in Cartography and Geographic Information Science, vol 36 n° 2 (April 2009)  

Public [article]  inCartography and Geographic Information Science > vol 36 n° 2 (April 2009) . - pp 131 - 147 Titre : A geodesic map projection for quadrilaterals Type de document : Article/Communication Auteurs : J. Crider, Auteur Année de publication : 2009 Article en page(s) : pp 131 - 147 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Projections [Termes IGN] polygone [Termes IGN] projection [Termes IGN] transformation de coordonnées [Termes IGN] transformation linéaire Résumé : (Auteur) Part of a cuboctahedron-based geodesic map projection by Buckminster Fuller is expanded to spherical quadrilaterals with opposite sides equal. Points on such a quadrilateral can be described by intersections of geodesies, which provide parameterized coordinate values in a Geodesic Coordinate System. Through a linear transform of the geodesic coordinates, a spherical quadrilateral maps to a parallelogram. The resulting map has the same constant scale on all four sides. Within the map, all lines parallel to the sides correspond to geodesies on the globe. Spherical rectangles, spherical squares, and diamonds (spherical rhombi) are specifically examined; various tiling sets of diamonds can be used to cover the globe. Non-projection applications in geometry, astronomy, and computer graphics are described. Copyright CaGISociety Numéro de notice : A2009-163 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/POSITIONNEMENT Nature : Article DOI : 10.1559/152304009788188781 En ligne : https://doi.org/10.1559/152304009788188781 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29793 [article]

Exemplaires(1)

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032-09021	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Star plots: how shape characteristics influence classification tasks / Alexander Klippel in Cartography and Geographic Information Science, vol 36 n° 2 (April 2009)  

Public [article]  inCartography and Geographic Information Science > vol 36 n° 2 (April 2009) . - pp 149 - 163 Titre : Star plots: how shape characteristics influence classification tasks Type de document : Article/Communication Auteurs : Alexander Klippel, Auteur ; F. Hardisty, Auteur ; C. Weaver, Auteur Année de publication : 2009 Article en page(s) : pp 149 - 163 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Cartographie thématique [Termes IGN] analyse multivariée [Termes IGN] classification [Termes IGN] sémiologie graphique [Termes IGN] symbole graphique Résumé : (Auteur) Our research addresses the question of how to design interfaces for spatial analysis such that they support cognitive processes. In this paper, we specifically target the question of map symbol design for the analysis of multivariate data, which is a common problem in cartography and related fields. We focus on star plots and the largely unaddressed question of how to assign variables to rays in a star plot and which consequences specific shapes haveas the result of data characteristics and the assignment of variables to rayson interpretation and classification. We conducted an experiment with two conditions that were designed to shed light on the question: Does the shape of a star plot influence the interpretation (meaning) of the data it represents in a classification task? While previous research on multivariate point symbols has addressed this question for Chernoff faces, for example, few connections have been made to the shape of a star plot and its potential influence on meaning. We found that certain salient shape characteristics induced by variations along the horizontal and vertical axis increase the classification speed. However, we also found that salient shapes, such as has one spike, introduce a perceptual similarity that overrides the assumed similarities in the meaning of the represented data. Copyright CaGISociety Numéro de notice : A2009-164 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1559/152304009788188808 En ligne : https://doi.org/10.1559/152304009788188808 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29794 [article]

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Visualizing migration flows using kriskograms / N. Xiao in Cartography and Geographic Information Science, vol 36 n° 2 (April 2009)  

Public [article]  inCartography and Geographic Information Science > vol 36 n° 2 (April 2009) . - pp 183 - 191 Titre : Visualizing migration flows using kriskograms Type de document : Article/Communication Auteurs : N. Xiao, Auteur ; Y. Chun, Auteur Année de publication : 2009 Article en page(s) : pp 183 - 191 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Cartographie thématique [Termes IGN] carte thématique [Termes IGN] flux [Termes IGN] migration humaine Résumé : (Auteur) This paper describes a new approach called kriskogram to visualizing migration flows. To create a kriskogram, geographical units are projected as a set of points on a straight line segment called a location line. The migration flow between two points on the location line is represented using a half-circle drawn from the origin to the destination in a clockwise direction. Translucent symbols and a classification scheme can be used to make a kriskogram more effective. We demonstrate this method using a set of interstate migration data of four time periods for the conterminous United States. Copyright CaGISociety Numéro de notice : A2009-165 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1559/152304009788188763 En ligne : https://doi.org/10.1559/152304009788188763 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29795 [article]

Exemplaires(1)

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032-09021	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Evaluation of the cartographic communication performance of a route guidance and navigation system / E. Pugliesi in Cartography and Geographic Information Science, vol 36 n° 2 (April 2009)  

Public [article]  inCartography and Geographic Information Science > vol 36 n° 2 (April 2009) . - pp 193 - 207 Titre : Evaluation of the cartographic communication performance of a route guidance and navigation system Type de document : Article/Communication Auteurs : E. Pugliesi, Auteur ; M. Decanini, Auteur ; V. Tachibana, Auteur Année de publication : 2009 Article en page(s) : pp 193 - 207 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] communication cartographique [Termes IGN] guidage de véhicules [Termes IGN] performance [Vedettes matières IGN] Cartologie Résumé : (Auteur) This study evaluates the influence of different cartographic representations of in-car navigation systems on visual demand, subjective preference, and navigational error. It takes into account the type and complexity of the representation, maneuvering complexity, road layout, and driver gender. A group of 28 drivers (14 male and 14 female) participated in this experiment which was performed in a low-cost driving simulator. The tests were performed on a limited number of instances for each type of representation, and their purpose was to carry out a preliminary assessment and provide future avenues for further studies. Data collected for the visual demand study were analyzed using non-parametric statistical analyses. Results confirmed previous research that showed that different levels of design complexity significantly influence visual demand. Non-grid-like road networks, for example, influence significantly visual demand and navigational error. An analysis of simple maneuvers on a grid-like road network showed that static and blinking arrows did not present significant differences. From the set of representations analyzed to assess visual demand, both arrows were equally efficient. From a gender perspective, women seem to look at the display more than men, but this factor was not significant. With respect to subjective preferences, drivers prefer representations with mimetic landmarks when they perform straight-ahead tasks. For maneuvering tasks, landmarks in a perspective model created higher visual demands. Copyright CaGISociety Numéro de notice : A2009-166 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1559/152304009788188745 En ligne : https://doi.org/10.1559/152304009788188745 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29796 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
032-09021	RAB	Revue	Centre de documentation	En réserve L003	Disponible