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A spatio-temporal scenario model for emergency decision / Cheng Liu in Geoinformatica, vol 22 n° 2 (April 2018)  

Public [article]  inGeoinformatica > vol 22 n° 2 (April 2018) . - pp 411 - 433 Titre : A spatio-temporal scenario model for emergency decision Type de document : Article/Communication Auteurs : Cheng Liu, Auteur ; Jing Qian, Auteur ; Danhuai Guo, Auteur ; Yi Liu, Auteur Année de publication : 2018 Article en page(s) : pp 411 - 433 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique [Termes IGN] cadre conceptuel [Termes IGN] catastrophe naturelle [Termes IGN] dommage matériel [Termes IGN] données spatiotemporelles [Termes IGN] modèle conceptuel de données [Termes IGN] outil d'aide à la décision [Termes IGN] relation topologique [Termes IGN] représentation [Termes IGN] secours d'urgence Résumé : (Auteur) A structural and quantitative representation of disaster status contributes to efficient emergency decision-making, for this purpose, a representation model for disaster status is developed in this paper, called spatio-temporal scenario model (short for STSM model). Concept of the term `scenario' is discussed at first. Then, based on the concept, STSM model is proposed and introduced in detail. It contains two components: developing scenario connotation and developing spatio-temporal framework. Scenario connotation is to develop representation of disaster status of each object, consisting of object representation and damage representation. Spatio-temporal framework is to develop representation of evolution of disaster status, consisting of representation of spatial relation, temporal relation, natural environment and emergency response. Finally, an example is provided to show the effectiveness of STSM model. Advantages of the developed model lie in four aspects: flexibility in describing dynamic disaster status; universal representation of disaster status contributing to similarity assessment; helping in evaluating emergency severity with the quantitative representation of disaster status. Moreover, it helps decision-makers obtain a more comprehensive representation for disaster evolution in a certain time space. Numéro de notice : A2018-368 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s10707-017-0313-2 Date de publication en ligne : 20/12/2017 En ligne : https://doi.org/10.1007/s10707-017-0313-2 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=90733 [article]

An extension of virtual globe to build on-demand geospatial data sharing capability using peer-to-peer technology / Yi Liu in Transactions in GIS, vol 16 n° 6 (December 2012)  

Public [article]  inTransactions in GIS > vol 16 n° 6 (December 2012) . - pp 807 - 827 Titre : An extension of virtual globe to build on-demand geospatial data sharing capability using peer-to-peer technology Type de document : Article/Communication Auteurs : Yi Liu, Auteur ; Bin Liu, Auteur ; Liwei Fan, Auteur Année de publication : 2012 Article en page(s) : pp 807 - 827 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique web [Termes IGN] globe virtuel [Termes IGN] interconnexion [Termes IGN] partage de données localisées Résumé : (Auteur) In the virtual globe system, ever higher performance is demanded for high quality service, especially when requesting intensive data from large-scale networks, such as large scene 3D city models with fine textures. Extending the virtual globe platform from the present centralized mode into a decentralized mode can significantly improve platform capacity and service quality without additional investment in hardware, but presents new challenges such as the time cost of finding a peer, unstable offering, and low service capacity. A GeoODP2P network is designed based on specific features of spatial data transmission. Next, we discuss peer selection mechanisms that relieve the negative influence of peers, and propose a pre-fetch mechanism that takes advantage of the unique characteristics of the P2P environment. This article implements a simulation system for a GeoODP2P network and presents a prototype platform that incorporates P2P functionality. Peer selection and pre-fetch mechanisms are studied and tested on this simulation system. The prototype platform run in a real scenario demonstrates the effectiveness of applying P2P to a virtual globe platform. Numéro de notice : A2012-617 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/j.1467-9671.2012.01346.x En ligne : https://doi.org/10.1111/j.1467-9671.2012.01346.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32063 [article]