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Automated thinning of road networks and road labels for multiscale design of The National Map of the United States / Cynthia A. Brewer in Cartography and Geographic Information Science, vol 40 n° 4 (September 2013)  

Public [article]  inCartography and Geographic Information Science > vol 40 n° 4 (September 2013) . - pp 259 - 270 Titre : Automated thinning of road networks and road labels for multiscale design of The National Map of the United States Type de document : Article/Communication Auteurs : Cynthia A. Brewer, Auteur ; Lauwrence V. Stanislawski, Auteur ; Barbara P. Buttenfield, Auteur Année de publication : 2013 Article en page(s) : pp 259 - 270 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées [Termes IGN] carte topographique [Termes IGN] conception cartographique [Termes IGN] Etats-Unis [Termes IGN] généralisation cartographique automatisée [Termes IGN] réseau routier [Termes IGN] simplification de contour [Termes IGN] The National Map (USA) [Termes IGN] traitement automatique de données [Termes IGN] traitement géométrique de données Résumé : (Auteur) This paper reports on progress in generalization and selective feature removal for a subset of fundamental base map layers that enables competent mapping through scales ranging from 1:24,000 to 1:1,000,000. Thinning and partitioning methods are applied to road features and labels for The National Map of the United States. Roads are thinned adaptively using the ArcGIS Thin Road Network geoprocessing tool, which removes features by feature hierarchy and network connectivity, yet preserves characteristic urban/rural local density patterns that can be lost through simple category removals. The paper describes thinning for label hierarchies within road categories, improved preference in placement for more important road labels, and selective removal of labels through scale. Use of the Radical Law to guide matches between thinning parameters and suitable scales of representation also is shown. Inspection of graphic results of these treatments can help to establish parameters for automated base map design for US topographic mapping. Numéro de notice : A2013-757 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1080/15230406.2013.799735 En ligne : https://doi.org/10.1080/15230406.2013.799735 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32893 [article]

Exemplaires(1)

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032-2013041	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Real-time generalization of point data in mobile and web mapping using quadtrees / Pia Bereuter in Cartography and Geographic Information Science, vol 40 n° 4 (September 2013)  

Public [article]  inCartography and Geographic Information Science > vol 40 n° 4 (September 2013) . - pp 271 - 281 Titre : Real-time generalization of point data in mobile and web mapping using quadtrees Type de document : Article/Communication Auteurs : Pia Bereuter, Auteur ; Robert Weibel, Auteur Année de publication : 2013 Article en page(s) : pp 271 - 281 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique web [Termes IGN] arbre quadratique [Termes IGN] généralisation à la volée [Termes IGN] généralisation cartographique automatisée [Termes IGN] objet géographique ponctuel [Termes IGN] structure de données localisées [Termes IGN] système de numérisation mobile [Termes IGN] téléphone intelligent [Termes IGN] temps réel [Termes IGN] web mapping Résumé : (Auteur) With a focus on mobile and web mapping, we propose several algorithms for on-the-fly generalization of point data, such as points of interest (POIs) or large point collections. In order to achieve real-time performance, we use a quadtree data structure. With their hierarchical subdivision structure and progressive levels of detail, indices of the quadtree family lend themselves as auxiliary data structures to support algorithms for generalization operations, including selection, simplification, aggregation, and displacement of point data. The spatial index can further be used to generate several local and global measures that can then serve to make educated guesses on the density and proximity of points across map scales, and thus enable control of the operation of the generalization algorithms. An implementation of the proposed algorithms has shown that, and thanks to the quadtree index, real-time performance can be achieved even for large point sets. Furthermore, the quadtree data structure can be extended into a caching structure, which can be used to store pre-computed generalizations; thus, a desired level of detail (LOD) can simply be retrieved from cache. Numéro de notice : A2013-758 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/15230406.2013.779779 En ligne : https://doi.org/10.1080/15230406.2013.779779 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32894 [article]

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The space oblique conic projection / Liucheng Ren in Cartography and Geographic Information Science, vol 40 n° 4 (September 2013)  

Public [article]  inCartography and Geographic Information Science > vol 40 n° 4 (September 2013) . - pp 282 - 282 Titre : The space oblique conic projection Type de document : Article/Communication Auteurs : Liucheng Ren, Auteur ; Keith C. Clarke, Auteur ; Chengzu Zhou, Auteur ; He Ren, Auteur Année de publication : 2013 Article en page(s) : pp 282 - 282 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Projections [Termes IGN] acquisition d'images [Termes IGN] image radar [Termes IGN] image SeaSat [Termes IGN] radar à visée latérale Résumé : (Auteur) The problem of determining a suitable map projection for side-looking synthetic aperture radar (SAR) satellite imagery is examined. Using a foundation in dynamic mathematics, a new Space Oblique Conic (SOC) projection is proposed that is specifically designed for a side-looking radar imagery. The geometric model of SOC is formalized, and the projection of the central line of a side-looking field of view is established based on this model. The forward and inverse formulas for the SOC projection are derived and the projection's pattern of distortion is discussed. As an example, SEASAT-A radar imagery is considered, and a particular SOC projection model for this satellite derived. Numéro de notice : A2013-759 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/POSITIONNEMENT Nature : Article DOI : 10.1080/15230406.2013.810804 En ligne : https://doi.org/10.1080/15230406.2013.810804 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32895 [article]

Exemplaires(1)

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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)  

Public [article]  inCartography and Geographic Information Science > vol 40 n° 4 (September 2013) . - pp 289 - 296 Titre : Blending world map projections with Flex Projector Type de document : Article/Communication Auteurs : Bernhard Jenny, Auteur ; Tom Patterson, Auteur Année de publication : 2013 Article en page(s) : pp 289 - 296 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Projections [Termes IGN] cartographie [Termes IGN] monde (géographie politique) [Termes IGN] projection Résumé : (Auteur) The idea of designing a new map projection via combination of two projections is well established. Some of the most popular world map projections in use today were devised in this manner. One construction method is to combine two source projections along a common parallel; a second method calculates the arithmetic means of two projections. These two methods for creating new world map projections are included in the latest version of Flex Projector. Flex Projector, afreeware mapping application, offers a graphical approach for customizing existing projections and creating new projections. The Mixer is a new feature in the latest version that allows the user to blend two existing projections to create a new hybrid projection. In addition to the two established combination methods, the software includes a new method for blending projections specific to its visual design approach. With this new method, a unique trait of one projection is transferable to a second projection. Flex Projector allows for the blending of four different projection traits separately or in combination: (1) the horizontal length of parallels, (2) the vertical distance of parallels from the equator, (3) the distribution of meridians, and (4) the bending of parallels. This article briefly describes the main characteristics of Flex Projector and then documents the new approaches to projection blending. The integration of the three methods into Flex Projector makes creating new projections simple and easy to control and allows the user to evaluate distortion characteristics of new projections. As an applied example, the article also introduces the new Pacific projection that is a blend of the Ginzburg VIII and Mollweide projections. Numéro de notice : A2013-760 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/POSITIONNEMENT Nature : Article DOI : 10.1080/15230406.2013.795002 En ligne : https://doi.org/10.1080/15230406.2013.795002 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32896 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
032-2013041	RAB	Revue	Centre de documentation	En réserve L003	Disponible

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)  

Public [article]  inCartography and Geographic Information Science > vol 40 n° 4 (September 2013) . - pp 297 - 304 Titre : Challenges in adapting example-based texture synthesis for panoramic map creation: a case study Type de document : Article/Communication Auteurs : Helen Jenny, Auteur ; Bernhard Jenny, Auteur Année de publication : 2013 Article en page(s) : pp 297 - 304 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Cartographie [Termes IGN] déformation géométrique [Termes IGN] image panoramique [Termes IGN] peinture [Termes IGN] synthèse d'image [Termes IGN] texture d'image Résumé : (Auteur) Panoramic hiking and skiing maps are popular among tourists and map collectors. Such three-dimensional (3D) maps allow for easy orientation and provide the observer with an immersive impression of the landscape to be discovered or remembered. The most impressive panoramic masterpieces are almost exclusively painted manually or with minor digital tool support. Software packages that allow modern cartographers to create 3D maps of comparable visual quality (semi-) automatically are currently not available. Computer graphics has developed a number of methods for painterly rendering, including imitating the characteristics of a panorama artist's brush stroke and raster-based methods that synthesize new texture from examples. In this article, the latter approach is explored, and the idea of creating terrain textures for arbitrary regions by reassembling them from pieces of scanned hand-painted masterworks is pursued. Panorama painters vary the appearance of land cover depending on terrain characteristics and viewing parameters. This article suggests how the example-based texture synthesis approach could be adapted to accommodate such dependencies. A case study of transferring the appearance of H.C. Berann's hand-painted panorama of the Swiss Jungfrau region to a digital panorama of a different region is presented. The case study shows that a number of previously unanticipated hurdles are encountered when using hand-painted panoramas as input to an example-based texture synthesis algorithm. By identifying the challenges of applying texture-by-example to panoramic map making and by suggesting possible solutions, the authors aim to promote the creation of more visually appealing and legible digital panoramic maps. Numéro de notice : A2013-761 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/15230406.2013.795001 En ligne : https://doi.org/10.1080/15230406.2013.795001 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32897 [article]

Exemplaires(1)

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Mapping social activities and concepts with social media (Twitter) and web search engines (Yahoo and Bing): a case study in 2012 US Presidential Election / Ming-Hsiang Tsou in Cartography and Geographic Information Science, vol 40 n° 4 (September 2013)  

Public [article]  inCartography and Geographic Information Science > vol 40 n° 4 (September 2013) . - pp 337 - 348 Titre : Mapping social activities and concepts with social media (Twitter) and web search engines (Yahoo and Bing): a case study in 2012 US Presidential Election Type de document : Article/Communication Auteurs : Ming-Hsiang Tsou, Auteur ; Jiue-An Yang, Auteur ; Brian Spitzberg, Auteur ; Jean Marc Gawron, Auteur ; Dipak Gupta, Auteur ; et al., Auteur Année de publication : 2013 Article en page(s) : pp 337 - 348 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale [Termes IGN] analyse diachronique [Termes IGN] comportement [Termes IGN] données issues des réseaux sociaux [Termes IGN] élection [Termes IGN] estimation par noyau [Termes IGN] Etats-Unis [Termes IGN] logiciel de navigation [Termes IGN] moteur de recherche [Termes IGN] ontologie [Termes IGN] Twitter Résumé : (Auteur) We introduce a new research framework for analyzing the spatial distribution of web pages and social media (Twitter) messages with related contents, called Visualizing Information Space in Ontological Networks (VISION). This innovative method can facilitate the tracking of ideas and social events disseminated in cyberspace from a spatial-temporal perspective. Thousands of web pages and millions of tweets associated with the same keywords were converted into visualization maps using commercial web search engines (Yahoo application programming interface (API) and Bing API), a social media search engine (Twitter APIs), Internet Protocol (IP) geolocation methods, and Geographic Information Systems (GIS) functions (e.g., kernel density and raster-based map algebra methods). We found that comparing multiple web information landscapes with different keywords or different dates can reveal important spatial patterns and “geospatial fingerprints” for selected keywords. We used the 2012 US Presidential Election candidates as our case study to validate this method. We noticed that the weekly changes of the geographic probability of hosting “Barack Obama” or “Mitt Romney” web pages are highly related to certain major campaign events. Both attention levels and the content of the tweets were deeply impacted by Hurricane Sandy. This new approach may provide a new research direction for studying human thought, human behaviors, and social activities quantitatively. Numéro de notice : A2013-762 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/15230406.2013.799738 En ligne : https://doi.org/10.1080/15230406.2013.799738 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32898 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
032-2013041	RAB	Revue	Centre de documentation	En réserve L003	Disponible