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Interpolating spatial interaction data / W. Jang in Transactions in GIS, vol 15 n° 4 (August 2011)  

Public [article]  inTransactions in GIS > vol 15 n° 4 (August 2011) . - pp 541 - 555 Titre : Interpolating spatial interaction data Type de document : Article/Communication Auteurs : W. Jang, Auteur ; X. Yao, Auteur Année de publication : 2011 Article en page(s) : pp 541 - 555 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale [Termes IGN] commutateur [Termes IGN] données localisées [Termes IGN] flux de données [Termes IGN] Géorgie (Etats-Unis) [Termes IGN] interpolation linéaire [Termes IGN] interpolation spatiale Résumé : (Auteur) Spatial interpolation has been widely used to improve the spatial granularity of data, or to mediate between inconsistent zoning schemes of spatial data. Traditional areal interpolation methods translate values of source zones to those of target zones. These methods have difficulty in dealing with flow data, as each instance is associated with a pair of zones. This study develops a new concept, flow line interpolation, to fill the abovementioned gap. We also develop a first flow line interpolation method to estimate commuting flow data between spatial units in a target zoning scheme based on such data in a source zoning scheme. Three models (i.e., areal-weighted, intelligent, and gravity-type flow line interpolation) are presented. To test the estimation accuracy and the application potential of these models, a case study of Fulton County in Georgia is conducted. The results reveal that both the areal-weighted and intelligent models are very promising flow line interpolation methods. Numéro de notice : A2011-348 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/j.1467-9671.2011.01273.x Date de publication en ligne : 16/08/2011 En ligne : https://doi.org/10.1111/j.1467-9671.2011.01273.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31127 [article]

Interoperable Internet mapping: an open source approach / X. Yao in Cartography and Geographic Information Science, vol 35 n° 4 (October 2008)  

Public [article]  inCartography and Geographic Information Science > vol 35 n° 4 (October 2008) . - pp 279 - 293 Titre : Interoperable Internet mapping: an open source approach Type de document : Article/Communication Auteurs : X. Yao, Auteur ; L.. Zou, Auteur Année de publication : 2008 Article en page(s) : pp 279 - 293 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes d'information géographique [Termes IGN] cartographie par internet [Termes IGN] internet [Termes IGN] interopérabilité [Termes IGN] logiciel libre [Termes IGN] service web géographique [Termes IGN] système d'information géographique [Termes IGN] Web Feature Service Résumé : (Auteur) The development of geographic information systems (GIS) is now being accompanied by an increasing popularity of Internet GIS mapping services. This study concerns two important issues with Internet GIS interoperability and Open source resources. Centering on the interplay of these two issues, we provide a systematic overview of techniques that have been used to deliver Internet GIS mapping and the relevance of the two issues with regard to these techniques. We then present a standard-and-open-source-based framework for Internet GIS mapping services to achieve data interoperability and high visual quality. The framework employs the Web Feature Service (WFS) to handle vector data and raster data. The Geography Markup Language (GML) standard is used for interoperable data storage and management. The Scalable Vector Graphic (SVG) standard is used to visualize GML data in web browsers. Two preliminary prototypes have been developed to demonstrate the capabilities of the framework. We conclude that using standard-based solutions is an important and viable direction of interoperable Internet GIS services. Advances in standardization and technology have significant implications for Internet GIS mapping. There are many powerful open sources tools which, when coupled with open standards, may be used to develop high-quality online GIS services. Importantly, these solutions require no investment in software, yet achieve excellent interoperability and visualization quality; they are excellent alternative approaches to Internet mapping. Copyright CaGISociety Numéro de notice : A2008-440 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1559/152304008786140560 En ligne : https://doi.org/10.1559/152304008786140560 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29509 [article]

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Visualisation of qualitative locations in geographic information systems / X. Yao in Cartography and Geographic Information Science, vol 32 n° 4 (October 2005)  

Public [article]  inCartography and Geographic Information Science > vol 32 n° 4 (October 2005) . - pp 219 - 229 Titre : Visualisation of qualitative locations in geographic information systems Type de document : Article/Communication Auteurs : X. Yao, Auteur ; Bin Jiang, Auteur Année de publication : 2005 Article en page(s) : pp 219 - 229 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Cartographie numérique [Termes IGN] carte interactive [Termes IGN] incertitude des données [Termes IGN] position directe [Termes IGN] position indirecte [Termes IGN] système d'information géographique [Termes IGN] traitement interactif [Termes IGN] visualisation cartographique Résumé : (Auteur) A qualitative location (QL) refers to the reference of a spatial location using linguistic terms such as qualitative descriptions and qualitative spatial relations with other geo-referenced features. Qualitative locations will be increasingly more popular in the future, driven by theoretical, technological, and database developments. Multiplicity and uncertainty are two innate characteristics of QLs. In other words, a QL often has multiple target locations (multiplicity), and the target locations sometimes cannot be pinpointed exactly due to the qualitative nature (uncertainty) of the qualitative descriptions and relations. The presence of the characteristics imposes research challenges on visualization of QL in geographic information systems (GIS). In response to the visualization challenges we discuss four strategies-namely proportional symbol mapping, fog map, fuzzy 3D surface, and fuzzy-logic-based animation-for the visualization of QL referents in GIS. These strategies combine conventional mapping and advanced interactive visualization methods. Each of them is suitable for one or more scenarios, depending on the presence of either one or both of the two characteristics. Numéro de notice : A2005-528 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1559/152304005775194683 En ligne : https://doi.org/10.1559/152304005775194683 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27664 [article]

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Code-barres	Cote	Support	Localisation	Section	Disponibilité
032-05041	RAB	Revue	Centre de documentation	En réserve L003	Disponible