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Building agent-based walking models by machine-learning on diverse databases of space-time trajectory samples / Paul M. Torrens in Transactions in GIS, vol 15 supplement s1 (July 2011)  

Public [article]  inTransactions in GIS > vol 15 supplement s1 (July 2011) . - pp 67 - 94 Titre : Building agent-based walking models by machine-learning on diverse databases of space-time trajectory samples Type de document : Article/Communication Auteurs : Paul M. Torrens, Auteur ; W. Griffin, Auteur ; X. Li, Auteur Année de publication : 2011 Article en page(s) : pp 67 - 94 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale [Termes IGN] agent (intelligence artificielle) [Termes IGN] analyse spatiale [Termes IGN] apprentissage automatique [Termes IGN] base de données spatiotemporelles [Termes IGN] itinéraire [Termes IGN] milieu urbain [Termes IGN] navigation pédestre [Termes IGN] piéton [Termes IGN] service fondé sur la position [Termes IGN] trajet (mobilité) Résumé : (Auteur) We introduce a novel scheme for automatically deriving synthetic walking (locomotion) and movement (steering and avoidance) behavior in simulation from simple trajectory samples. We use a combination of observed and recorded real-world movement trajectory samples in conjunction with synthetic, agent-generated, movement as inputs to a machine-learning scheme. This scheme produces movement behavior for non-sampled scenarios in simulation, for applications that can differ widely from the original collection settings. It does this by benchmarking a simulated pedestrian's relative behavioral geography, local physical environment, and neighboring agent-pedestrians; using spatial analysis, spatial data access, classification, and clustering. The scheme then weights, trains, and tunes likely synthetic movement behavior, per-agent, per-location, per-time-step, and per-scenario. To prove its usefulness, we demonstrate the task of generating synthetic, non-sampled, agent-based pedestrian movement in simulated urban environments, where the scheme proves to be a useful substitute for traditional transition-driven methods for determining agent behavior. The potential broader applications of the scheme are numerous and include the design and delivery of location-based services, evaluation of architectures for mobile communications technologies, what-if experimentation in agent-based models with hypotheses that are informed or translated from data, and the construction of algorithms for extracting and annotating space-time paths in massive data-sets. Numéro de notice : A2011-251 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/j.1467-9671.2011.01261.x Date de publication en ligne : 09/06/2011 En ligne : https://doi.org/10.1111/j.1467-9671.2011.01261.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31029 [article]

A new GIScience application for visualized natural resources management and decision support / Y. Yang in Transactions in GIS, vol 15 supplement s1 (July 2011)  

Public [article]  inTransactions in GIS > vol 15 supplement s1 (July 2011) . - pp 109 - 124 Titre : A new GIScience application for visualized natural resources management and decision support Type de document : Article/Communication Auteurs : Y. Yang, Auteur ; Y. Lin, Auteur Année de publication : 2011 Article en page(s) : pp 109 - 124 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications SIG [Termes IGN] consommation [Termes IGN] eau souterraine [Termes IGN] impact sur l'environnement [Termes IGN] interface graphique [Termes IGN] outil d'aide à la décision [Termes IGN] requête spatiale [Termes IGN] ressources en eau [Termes IGN] risque naturel [Termes IGN] WebSIG Résumé : (Auteur) This article presents two decision support plug-ins in free GIS software: ArcGIS Explorer Desktop. The ubiquitous WebGIS Analysis Toolkit for Extensive Resources (uWATER) focuses on providing GIS analysis functions: spatial and attribute queries in the public services tool for users with limited access to commercial GIS software. The interface of uWATER is general enough to support decision-making in numerous management issues in natural resources, economics and agriculture. The uWATER-Pumping Assessment (uWATER-PA) toolkit, on the other hand, is an extended package targeting the specific environmental issue of groundwater pumping impacts. The uWATER-PA package is an excellent alternative to evaluating complex groundwater pumping assessment issues before investing significant time, labor, and funds in monitoring and detailed scientific study. It incorporates simulation of the physics of groundwater flow and user interaction into GIS software. A graphical user interface makes both data entry and interpretation of results intuitive to non-technical individuals. Results are presented as colored drawdown maps and can be saved in GIS format for future dissemination. The impact of drawdown on existing wells can be characterized and mapped, through the use of uWATER's spatial query capabilities and the drawdown maps generated by uWATER-PA. Numéro de notice : A2011-253 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/j.1467-9671.2011.01267.x Date de publication en ligne : 09/06/2011 En ligne : https://doi.org/10.1111/j.1467-9671.2011.01267.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31031 [article]

Matching INSPIRE quality of service requirements with hybrid clouds / B. Baranski in Transactions in GIS, vol 15 supplement s1 (July 2011)  

Public [article]  inTransactions in GIS > vol 15 supplement s1 (July 2011) . - pp 125 - 142 Titre : Matching INSPIRE quality of service requirements with hybrid clouds Type de document : Article/Communication Auteurs : B. Baranski, Auteur ; B. Schäffer, Auteur ; Theodor Foerster, Auteur ; K. Lange, Auteur Année de publication : 2011 Article en page(s) : pp 125 - 142 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Infrastructure de données [Termes IGN] base de données répartie [Termes IGN] données localisées des bénévoles [Termes IGN] implémentation (informatique) [Termes IGN] informatique en nuage [Termes IGN] infrastructure nationale des données localisées [Termes IGN] intégration de données [Termes IGN] qualité de service Résumé : (Auteur) A lot of effort has been invested in Spatial Data Infrastructures (SDIs) during the last decade regarding interoperable standards for services and data. But still the scalability and performance of SDI services is reported to be crucial especially if they are accessed concurrently by a high number of users. Furthermore, laws and provisions such as the INSPIRE directive specify challenging requirements regarding the performance, availability and scalability of SDI services. This article presents a Hybrid Cloud architecture for matching INSPIRE-related Quality of Service (QoS) requirements, without investing in rarely used hardware in advance, by occupying external third-party resources on a pay-as-you-go basis. The presented Hybrid Cloud is a composition of a local IT-infrastructure (Private Cloud) and the computational resources of third-party vendors (Public Cloud). The local infrastructure is laid out to handle the average main load of a service and in lasting peak times additional resources of external providers are allocated and integrated on demand into the local infrastructure to provide sufficient service quality automatically. A proof-of-concept implementation of the proposed Hybrid Cloud approach is evaluated and benchmarked with respect to INSPIRE-related QoS requirements. Numéro de notice : A2011-254 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/SOCIETE NUMERIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/j.1467-9671.2011.01265.x Date de publication en ligne : 09/06/2011 En ligne : https://doi.org/10.1111/j.1467-9671.2011.01265.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31032 [article]