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Elevation models for reproducible evaluation of terrain representation / Patrick Kennelly in Cartography and Geographic Information Science, vol 48 n° 1 (January 2021)  

Public [article]  inCartography and Geographic Information Science > vol 48 n° 1 (January 2021) . - pp 63 - 77 Titre : Elevation models for reproducible evaluation of terrain representation Type de document : Article/Communication Auteurs : Patrick Kennelly, Auteur ; Tom Patterson, Auteur ; Bernhard Jenny, Auteur ; et al., Auteur Année de publication : 2021 Article en page(s) : pp 63 - 77 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique [Termes IGN] altitude [Termes IGN] données multiéchelles [Termes IGN] figuré du terrain [Termes IGN] modèle numérique de surface [Termes IGN] réalité de terrain [Termes IGN] relief [Termes IGN] représentation du relief [Termes IGN] reproductibilité [Termes IGN] visualisation de données Résumé : (auteur) This paper proposes elevation models to promote, evaluate, and compare various terrain representation techniques. Our goal is to increase the reproducibility of terrain rendering algorithms and techniques across different scales and landscapes. We introduce elevation models of varying terrain types, available to the user at no cost, with minimal common data imperfections such as missing data values, resampling artifacts, and seams. Three multiscale elevation models are available, each consisting of a set of elevation grids, centered on the same geographic location, with increasing cell sizes and spatial extents. We also propose a collection of single-scale elevation models of archetypal landforms including folded ridges, a braided riverbed, active and stabilized sand dunes, and a volcanic caldera. An inventory of 78 publications with a total of 155 renderings illustrating terrain visualization techniques guided the selection of landform types in the elevation models. The benefits of using the proposed elevation models include straightforward comparison of terrain representation methods across different publications and better documentation of the source data, which increases the reproducibility of terrain representations. Numéro de notice : A2021-719 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/15230406.2020.1830856 date de publication en ligne : 04/11/2020 En ligne : https://doi.org/10.1080/15230406.2020.1830856 Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=96459 [article]

The Equal Earth map projection / Bojan Šavrič in International journal of geographical information science IJGIS, Vol 33 n° 3-4 (March - April 2019)  

Public [article]  inInternational journal of geographical information science IJGIS > Vol 33 n° 3-4 (March - April 2019) . - pp 454 - 465 Titre : The Equal Earth map projection Type de document : Article/Communication Auteurs : Bojan Šavrič, Auteur ; Tom Patterson, Auteur ; Bernhard Jenny, Auteur Année de publication : 2019 Article en page(s) : pp 454 - 465 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Projections [Termes IGN] carroyage géographique [Termes IGN] mappemonde [Termes IGN] projection (équivalente) de Mollweide [Termes IGN] projection de Peters [Termes IGN] projection de Robinson [Termes IGN] projection sinusoïdale Résumé : (auteur) The Equal Earth map projection is a new equal-area pseudocylindrical projection for world maps. It is inspired by the widely used Robinson projection, but unlike the Robinson projection, retains the relative size of areas. The projection equations are simple to implement and fast to evaluate. Continental outlines are shown in a visually pleasing and balanced way. Numéro de notice : A2019-023 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/13658816.2018.1504949 date de publication en ligne : 07/08/2018 En ligne : https://doi.org/10.1080/13658816.2018.1504949 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91951 [article]

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Enhancing adaptive composite map projections: Wagner transformation between the Lambert azimuthal and the transverse cylindrical equal-area projections / Bernhard Jenny 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 456 - 463 Titre : Enhancing adaptive composite map projections: Wagner transformation between the Lambert azimuthal and the transverse cylindrical equal-area projections Type de document : Article/Communication Auteurs : Bernhard Jenny, Auteur ; Bojan Šavrič, Auteur Année de publication : 2018 Article en page(s) : pp 456 - 463 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Projections [Termes IGN] cartographie dynamique [Termes IGN] changement de projection [Termes IGN] projection azimutale équivalente de lambert [Termes IGN] projection conique [Termes IGN] projection cylindrique Résumé : (Auteur) The adaptive composite map projection technique changes the projection to minimize distortion for the geographic area shown on a map. This article improves the transition between the Lambert azimuthal projection and the transverse equal-area cylindrical projection that are used by adaptive composite projections for portrait-format maps. Originally, a transverse Albers conic projection was suggested for transforming between these two projections, resulting in graticules that are not symmetric relative to the central meridian. We propose the alternative transverse Wagner transformation between the two projections and provide equations and parameters for the transition. The suggested technique results in a graticule that is symmetric relative to the central meridian, and a map transformation that is visually continuous with changing map scale. Numéro de notice : A2018-273 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/MATHEMATIQUE/POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/15230406.2017.1379036 date de publication en ligne : 02/10/2017 En ligne : https://doi.org/10.1080/15230406.2017.1379036 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=90339 [article]

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Force-directed layout of origin-destination flow maps / Bernhard Jenny in International journal of geographical information science IJGIS, vol 31 n° 7-8 (July - August 2017)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 31 n° 7-8 (July - August 2017) . - pp 1521 - 1540 Titre : Force-directed layout of origin-destination flow maps Type de document : Article/Communication Auteurs : Bernhard Jenny, Auteur ; Daniel M. Stephen, Auteur ; Ian Muehlenhaus, Auteur ; et al., Auteur Année de publication : 2017 Article en page(s) : pp 1521 - 1540 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Cartographie numérique [Termes IGN] cartographie des flux [Termes IGN] chevauchement [Termes IGN] conception cartographique [Termes IGN] courbe de Bézier [Termes IGN] origine - destination Résumé : (Auteur) This paper introduces a force-directed layout method for creating origin-destination flow maps. Design principles derived from manual cartography and automated graph drawing to increase readability of flow maps and graph layouts are taken into account. The origin-destination flow maps produced with our algorithm show flows with quadratic Bézier curves that reduce flow-on-flow and flow-on-node overlaps, and avoid sharp or irregular bends in flow lines. A survey of expert cartographers found that flow maps created with our automated method are similar in quality to manually produced flow maps. Numéro de notice : A2017-310 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/13658816.2017.1307378 En ligne : http://dx.doi.org/10.1080/13658816.2017.1307378 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=85357 [article]

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Interactive shearing for terrain visualization : an expert study / Jonas Buddeberg in Geoinformatica [en ligne], vol 21 n° 3 (July - September 2017)  

Public [article]  inGeoinformatica [en ligne] > vol 21 n° 3 (July - September 2017) . - pp 643 - 665 Titre : Interactive shearing for terrain visualization : an expert study Type de document : Article/Communication Auteurs : Jonas Buddeberg, Auteur ; Bernhard Jenny, Auteur ; Wesley Willett, Auteur Année de publication : 2017 Article en page(s) : pp 643 - 665 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique [Termes IGN] animation graphique [Termes IGN] carte topographique [Termes IGN] extraction de traits caractéristiques [Termes IGN] extraction du relief [Termes IGN] figuré du terrain [Termes IGN] implémentation (informatique) [Termes IGN] lecture de carte [Termes IGN] test de performance [Termes IGN] visualisation 3D [Termes IGN] web mapping Résumé : (Auteur) Interpreting terrain in traditional 2D maps can be challenging. However, recent work has shown how interactive shearing of terrain can help users better understand topography and extract elevation information from a map. Using this approach, user input – paired with existing interactions such as pan and zoom – triggers brief ephemeral shearing animations that expose depth and shape information in terrain maps. The animations use motion to enhance the perception of depth and convey the impression of a shaking jelly model that oscillates until it comes to rest. However, it is still unclear how the parameters of these animations impact the effectiveness of the method or if the animations may have negative side effects. Moreover, it is unknown whether interactive relief shearing is accessible enough to be used in common web maps. To investigate these questions, we conducted a user study with 49 cartographers and visualization experts. These experts interactively configured shearing animations and assessed the technique’s usability and applicability. To create a platform for the user study and demonstrate that interactive shearing of terrain is technically feasible in browsers, we implemented a web map with interactive shearing animations. All experts found that interactive relief shearing made it easier to see differences in elevation on orthophoto maps. Future web maps could include shearing animations, making it easier for viewers to interpret terrain and see differences in elevation. Numéro de notice : A2017-385 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1007/s10707-016-0283-9 En ligne : https://doi.org/10.1007/s10707-016-0283-9 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=85818 [article]

Projection Wizard – An online map projection selection tool / Bojan Šavrič in Cartographic journal (the), Vol 53 n° 2 (May 2016)  

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Plan oblique relief for web maps / Bernhard Jenny in Cartography and Geographic Information Science, Vol 42 n° 5 (November 2015)  

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User preferences for world map projections / Bojan Šavrič in Cartography and Geographic Information Science, Vol 42 n° 5 (November 2015)  

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Design principles for Swiss-style rock drawing / Bernhard Jenny in Cartographic journal (the), vol 51 n° 4 (November 2014)

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Blending world map projections with Flex Projector / Bernhard Jenny in Cartography and Geographic Information Science, vol 40 n° 4 (September 2013)  

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Challenges in adapting example-based texture synthesis for panoramic map creation: a case study / Helen Jenny in Cartography and Geographic Information Science, vol 40 n° 4 (September 2013)  

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Cartographic Design and Aesthetics “FAQ” / Alexander J. Kent in Cartographic perspectives, n° 73 (september 2012)  

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