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Web mercator and raster tile maps : two cornerstones of online map service providers / Emmanuel Stefanakis in Geomatica, vol 71 n° 2 (June 2017)
[article]
Titre : Web mercator and raster tile maps : two cornerstones of online map service providers Type de document : Article/Communication Auteurs : Emmanuel Stefanakis, Auteur Année de publication : 2017 Article en page(s) : pp 100 - 109 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique web
[Termes IGN] dalle
[Termes IGN] données maillées
[Termes IGN] projection Universal Transverse Mercator
[Termes IGN] web mappingRésumé : (Auteur)[introduction] The popularity of online map service providers, such as Google Maps, Bing Maps, ArcGIS Online, and OpenStreetMap, has rapidly grown in recent years. It is hard for younger people to imagine and for older people to remember a world without web maps (or, in the same way, without mobile phones), a world that was the reality less than a dozen years ago. Throughout these years, the developers of online map service providers had to address numerous technological challenges. They were called to provide efficient solutions and increase the popularity of the services by delivering voluminous map data to an ever increasing number of web users; and all that over a web infrastructure with severe limitations (low speed, compatibility issues, etc.). Apparently, they had to take important decisions that have eventually affected the technological developments and have imposed de facto standardizations on the online mapping domain. Inevitably, some of these decisions have also had an impact on well-established rules for visualization and delivery of digital maps over the Web. This article focuses onto two corner stones of modern online map services: Web Mercator Projection and Raster Tile Maps. Four hundred and fifty years after the Flemish geographer and cartographer Gerardus Mercator published the most popular map projection ever, Google introduced the Web Mercator variant, which, despite its initial rejection by cartographic committees as “an inappropriate geodesy and cartography,” rapidly became a de facto standard and was adopted by most online map service providers. The tiling of large maps is an old practice. Large paper maps have always been divided into a series of map sheets at various scales. With the increasing popularity of web mapping applications and the rapid growth of map data availability, the pre-computation and caching of map image tiles has become a common practice in online map services, as they use far fewer server resources than maps rendered on demand. The creation of map tiles depends on a series of properties (shape and size of tiles, numbering of zoom levels, subdivision scheme of a tile, etc.). Combining tiles from various servers, including online map providers, might involve some simple or complex transformations. Over the last decade, the values for the above properties have been standardized to facilitate the interoperability between data and applications. The content of this article is organized as follows. Section 2 briefly presents the framework of map services over the Web and describes the technological and cartographical challenges faced by online providers. Section 3 explains the roots and properties of Web Mercator projection. Section 4 describes the map tiles and cached map services. Finally, Section 5 concludes the discussion. Numéro de notice : A2017-846 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.5623/cig2017-203 En ligne : https://doi.org/10.5623/cig2017-203 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=89443
in Geomatica > vol 71 n° 2 (June 2017) . - pp 100 - 109[article]Developing an integrated cloud-based spatial-temporal system for monitoring phenology / M. Cope in Ecological Informatics, vol 39 (May 2017)
[article]
Titre : Developing an integrated cloud-based spatial-temporal system for monitoring phenology Type de document : Article/Communication Auteurs : M. Cope, Auteur ; E. Mikhailova, Auteur ; C. Post, Auteur ; M. Schlautman, Auteur ; P. McMillan, Auteur Année de publication : 2017 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique web
[Termes IGN] ArcGIS online
[Termes IGN] données écologiques
[Termes IGN] géovisualisation
[Termes IGN] image Flickr
[Termes IGN] informatique en nuage
[Termes IGN] intégration de données
[Termes IGN] inventaire de la végétation
[Termes IGN] phénologie
[Termes IGN] surveillance écologique
[Termes IGN] web mappingRésumé : (auteur) Geospatial cloud computing offers computing infrastructure, software and data services that enable rapid integration of ecological data from various resources. The objectives of this study were to utilize readily-available and low-cost technology (e.g., GPS–enabled cameras, Cloud photo storage, Google Drive) to create a cloud-based spatial-temporal inventory of plant (including flowering phenology) and other relevant information. An interactive ArcGIS Online Map of Lake Issaqueena, SC with sampling locations of flowering plants allows users to obtain additional information (plant, soil, weather data) by selecting sampling locations or soil polygons. The contents of the map can be filtered using any of the attributes (e.g., growth form) in the data tables by selecting specific information. Plant information can be viewed at custom time intervals using the settings in ArcGIS Online. Spatial patterns (e.g., clustering) in the plant data can be viewed using the ArcGIS Online heat map view. The map can be easily queried and viewed on both computers and hand-held devices. Services from multiple cloud infrastructures can be integrated for use by various species monitoring programs, improving workflow and assessment capabilities. Numéro de notice : A2017-184 Affiliation des auteurs : non IGN Thématique : FORET/GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.ecoinf.2017.04.007 En ligne : http://doi.org/10.1016/j.ecoinf.2017.04.007 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=84751
in Ecological Informatics > vol 39 (May 2017)[article]Spatial query based virtual reality GIS analysis platform / Weixi Wang in Neurocomputing, vol (2017)
[article]
Titre : Spatial query based virtual reality GIS analysis platform Type de document : Article/Communication Auteurs : Weixi Wang, Auteur ; Zhihan Lv, Auteur ; Xiaoming Li, Auteur ; et al., Auteur Année de publication : 2017 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] données massives
[Termes IGN] globe virtuel
[Termes IGN] index spatial
[Termes IGN] réalité virtuelle
[Termes IGN] requête spatiale
[Termes IGN] scène virtuelle
[Termes IGN] visualisation 3D
[Termes IGN] WebSIG
[Vedettes matières IGN] GéovisualisationRésumé : (auteur) A virtual reality GIS analysis platform based on spatial query is proposed in this paper. The proposed platform serves 3D digital city and supports integrated VRGIS functions including 3D spatial analysis functions and 3D visualization functions for spatial process. The 3D analysis and visualization of the concerned city massive information are conducted on the platform. The amount of information that can be visualized through this platform is overwhelming, and the GIS-based navigational scheme allows great flexibility in accessing different available data sources. A multi-level mixed three-dimensional space index is built for the virtual scene. Multi-task parallel scheduling and pre-scheduling algorithms are designed to support the distribution and query of spatial data. Experiment result indicates that the designed query algorithm improves the performance of the proposed system. Numéro de notice : A2017-148 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1016/j.neucom.2016.06.099 Date de publication en ligne : 11/04/2017 En ligne : http://doi.org/10.1016/j.neucom.2016.06.099 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=84643
in Neurocomputing > vol (2017)[article]A virtual globe-based visualization and interactive framework for a small craft navigation assistance system in the near sea / Xinzhu Liu in Journal of Traffic and Transportation Engineering (English Edition), n° (April 2017)
[article]
Titre : A virtual globe-based visualization and interactive framework for a small craft navigation assistance system in the near sea Type de document : Article/Communication Auteurs : Xinzhu Liu, Auteur ; Shigeaki Shiotani, Auteur Année de publication : 2017 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] C#
[Termes IGN] dommage physique
[Termes IGN] globe virtuel
[Termes IGN] Japon
[Termes IGN] Javascript (langage de script)
[Termes IGN] KML
[Termes IGN] navigation maritime
[Termes IGN] objet mobile
[Termes IGN] programmation adaptée à l'objet
[Termes IGN] service web géographique
[Termes IGN] SIG 3D
[Termes IGN] temps réel
[Vedettes matières IGN] GéovisualisationRésumé : (auteur) With the growing popularization of small crafts, the accidents that happen among such crafts are also drawing increasing attention, according to the marine accident data released by the Japan Coast Guard. In order to prevent possible navigation accidents, the authors considered that besides sharing information from land by the coast office broadly, managers on land can also watch out and give appropriate advice for operators in crafts one-to-one. This paper discusses the technical issues of developing virtual globe-based (Google Maps/Earth geographic information system (GIS)) 3D visualization stand-alone software for small craft navigation assistance in the aim to facilitate the safety and sufficiency of small crafts in the near sea. The system was developed using web services and object-oriented programming disciplines to support the integration of a virtual global framework, GPS, and real-time imaging data. The authors have also developed data processing programs that are glued together with C# language, JavaScript language, National Marine Electronics Association (NMEA) instance data, and keyhole markup language (KML) data. Experiments for evaluating the framework have been made around the near coastal area. The performances and deficiencies are discussed in this paper. In order to evaluate the validity of the performance and the functionality of the system, authors conducted a questionnaire survey among third year students of the Voyage Course at Kobe University. The evaluation of the system suggests valuable potential for the small craft navigation assistance system. Numéro de notice : A2017-132 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1016/j.jtte.2016.03.011 En ligne : http://doi.org/10.1016/j.jtte.2016.03.011 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=84537
in Journal of Traffic and Transportation Engineering (English Edition) > n° (April 2017)[article]
Titre : EuroSDR seminar report Graphical interfaces for historical data Type de document : Actes de congrès Auteurs : Bénédicte Bucher , Éditeur scientifique ; François Golay, Éditeur scientifique Editeur : Dublin : European Spatial Data Research EuroSDR Année de publication : 2017 Collection : EuroSDR Workshop report Conférence : EuroSDR 2017, Seminar Graphical interfaces for historical data 26/06/2017 26/06/2017 Saint-Mandé France Importance : 15 p. Format : 21 x 30 cm Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique web
[Termes IGN] base de données historiques
[Termes IGN] base de données localisées
[Termes IGN] géoportail
[Termes IGN] interface graphique
[Termes IGN] interface web
[Termes IGN] organisme cartographique national
[Termes IGN] valorisation des donnéesRésumé : (auteur) Digitized archives of national mapping agencies are valuable assets for a number of usages. One is to evaluate hypothesis about a past state of Earth – for example to assess the past presence of water sources based on old maps - , another usage is to observe dynamics – for example to describe urban sprawl based on series of images and maps - and to geo - reference documents that can be indexed and integrated based on their location in time and space. Last, a growing need is to provide a referencing framework in space and time for thematic digitized data, typically in the digital humanities or in the cultural industry. Besides, more and more data are being produced and the question of how to archive them efficiently is tightly related to the expected usage of the archives. Late 2014, EuroSDR started a specific initiative targeting the valorization of existing digitized archives of national mapping agencies and cadasters - following up the EuroSDR Archiving project - extended to any geodata that has been or will be replaced by newer one. A first seminar in December 2014 led to define a strategy comprising two facets. First facet was to reach out users to learn from them what are the priorities and requirements. Second facet was to share more elements between NMCAs’ good practices, and then maybe infrastructure components, datasets, servers, software, licenses, etc. but also with other actors. A follow up seminar targeted both facets through the focus on graphical interfaces. It aimed at presenting latest research and developments about graphical interfaces to interact with geographical historical data, at getting more insight on user communities’ requirements and fostering collaborations between national mapping agencies, academics and the industry in this domain. This report presents the highlights of this EuroSDR seminar of graphical interfaces for historical data, which took place in Saint Mandé (near Paris, France), on June 26th 2017. It was organized in three parts: presentations from national portals, presentations from research, discussions to draft a EuroSDR roadmap on graphical interfaces for historical data. Numéro de notice : 17506 Affiliation des auteurs : LASTIG COGIT+Ext (2012-2019) Thématique : GEOMATIQUE Nature : Actes nature-HAL : DirectOuvrColl/Actes DOI : sans En ligne : http://www.eurosdr.net/publications/eurosdr-seminar-report-graphical-interfaces- [...] Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=90436 Documents numériques
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EuroSDR seminar report Graphical interfaces - pdf éditeurAdobe Acrobat PDF A virtual globe-oriented visualization method for 3D meteorological fields / Jing Chen in Geomatics and Information Science of Wuhan University, vol 41 n° 12 (December 2016)PermalinkRendering interior-filled polygonal vector data in a virtual globe / Mengyun Zhou in International journal of geographical information science IJGIS, vol 30 n° 11-12 (November - December 2016)PermalinkAn adaptable equal-area pseudoconic map projection / Daniel "daan" Strebe in Cartography and Geographic Information Science, Vol 43 n° 4 (September 2016)PermalinkLa cartographie à l'heure du géoweb : retour sur les nouveaux modes de représentation spatiale des données numériques / Boris Mericskay in Cartes & Géomatique, n° 229-230 (septembre 2016 - février 2017)PermalinkFrom virtual globes to ArcheoGIS : determining the technical and practical feasibilities / Berdien de Roo in Photogrammetric Engineering & Remote Sensing, PERS, vol 82 n° 9 (September 2016)PermalinkInteractive map to illustrate seat distributions of political party support levels : a web GIS application / Yifei Chen in Cartographica, vol 51 n° 3 (Fall 2016)PermalinkFrom taxonomies to ontologies: formalizing generalization knowledge for on-demand mapping / Nicholas Gould in Cartography and Geographic Information Science, Vol 43 n° 3 (June 2016)PermalinkNew 3D Map Solution Covering Norway / Kenneth Øyen-Eriksen in GIM international [en ligne], vol 30 n° 6 (June 2016)PermalinkLe géoportail de la confédération: 3D Viewer et des 3D services / Cédric Métraux in Géomatique suisse, vol 114 n° 5 (mai 2016)PermalinkOnline interactive thematic mapping: Applications and techniques for socio-economic research / Duncan A. Smith in Computers, Environment and Urban Systems, vol 57 (May 2016)Permalink