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Dépouillements
Ajouter le résultat dans votre panierA Temporal variant-invariant validation approach for agent-based models of landscape dynamics / Christopher Bone in Transactions in GIS, vol 18 n° 2 (April 2014)
Titre : A Temporal variant-invariant validation approach for agent-based models of landscape dynamics Type de document : Article/Communication Auteurs : Christopher Bone, Auteur ; Bart Johnson, Auteur ; Max Nielsen-Pincus, Auteur ; Eric Sproles, Auteur ; John Bolte, Auteur Année de publication : 2014 Article en page(s) : pp 161 - 182 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique
[Termes IGN] analyse de variance
[Termes IGN] modèle de simulation
[Termes IGN] Oregon (Etats-Unis)
[Termes IGN] simulation
[Termes IGN] système multi-agentsRésumé : (Auteur) Agent-based modeling provides a means for addressing the way human and natural systems interact to change landscapes over time. Until recently, evaluation of simulation models has focused on map comparison techniques that evaluate the degree to which predictions match real-world observations. However, methods that change the focus of evaluation from patterns to processes have begun to surface; that is, rather than asking if a model simulates a correct pattern, models are evaluated on their ability to simulate a process of interest. We build on an existing agent-based modeling validation method in order to present a temporal variant-invariant analysis (TVIA). The enhanced method, which focuses on analyzing the uncertainty in simulation results, examines the degree to which outcomes from multiple model runs match some reference to how land use parcels make the transition from one land use class to another over time. We apply TVIA to results from an agent-based model that simulates the relationships between landowner decisions and wildfire risk in the wildland-urban interface of the southern Willamette Valley, Oregon, USA. The TVIA approach demonstrates a novel ability to examine uncertainty across time to provide an understanding of how the model emulates the system of interest. Numéro de notice : A2014-163 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/tgis.12016 Date de publication en ligne : 09/06/2013 En ligne : https://doi.org/10.1111/tgis.12016 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33068
in Transactions in GIS > vol 18 n° 2 (April 2014) . - pp 161 - 182[article]
Titre : Urban structure generalization in multi-agent process by use of reactional agents Type de document : Article/Communication Auteurs : Jérémy Renard Année de publication : 2014 Article en page(s) : pp 201 - 218 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] AGENT
[Termes IGN] alignement
[Termes IGN] bati
[Termes IGN] généralisation cartographique automatisée
[Termes IGN] système multi-agents
[Termes IGN] zone urbaine dense
[Vedettes matières IGN] GénéralisationRésumé : (Auteur) This article proposes an improvement of automated cartographic generalization using multi-agent sytems in urban areas. Indeed the AGENT model, whose robustness has been tested and approved through the European project AGENT, gives very good results in generalizing dense urban areas by means of enlargement, removal and displacement of buildings. But this model does not tackle the question of including particular structures like building alignments in the process, which is a crucial issue. The problem is that integrating such structures does not fit into the accurate top-down hierarchy of urban agents. In order to face this problem, we propose to partly re-engineer the model by introducing the concept of reactional agents whose behavior is very different from hierarchical agents of the original model as they use bottom-up activation. In this view, urban alignment is considered to be a reactional agent activated only by its inner buildings, which generalizes the aligned buildings together into one entire structure. Associating reactional alignment behavior with new generalization actions on alignments significantly improves the model and gives better results in dense urban areas. Moreover, the idea could probably be used for other applications. Numéro de notice : A2014-164 Affiliation des auteurs : LASTIG COGIT (2012-2019) Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/tgis.12018 Date de publication en ligne : 19/03/2013 En ligne : https://doi.org/10.1111/tgis.12018 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33069
in Transactions in GIS > vol 18 n° 2 (April 2014) . - pp 201 - 218[article]Documents numériques
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Titre : A morphological approach to predicting urban expansion Type de document : Article/Communication Auteurs : Jamal Jokar Arsanjani, Auteur ; Marco Helbich, Auteur ; Ali Jafar Mousivand, Auteur Année de publication : 2014 Article en page(s) : pp 219 - 233 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale
[Termes IGN] analyse diachronique
[Termes IGN] croissance urbaine
[Termes IGN] modèle conceptuel de données spatio-temporelles
[Termes IGN] morphologie urbaine
[Termes IGN] prédiction
[Termes IGN] TéhéranRésumé : (Auteur) Many methods for modeling urban expansion are available. Most of these computational models demand a variety of large-scale environmental and socio-economic data to investigate the relationship between urban expansion and its driving forces. These requirements are not always fulfilled, particularly in developing countries due to a lack of data availability. This necessitates methods not suffering from data limitations to ease their application. Consequently, this research presents a morphological approach for predicting urban expansion on the basis of spatiotemporal dynamics of urban margins by investigating the interior metropolitan area of Tehran, Iran as a case study. To assess the model's performance, urban expansion is monitored from 1976 to 2012. The proposed model is evaluated to ensure that the prediction performance for the year 2012 is acceptable. For the year 2024, the model predicts Tehran's urban expansion at an overall R2 of 88%. Accordingly, it is concluded that: (1) although this approach only inputs urban margins, it represents a suitable and easy-to-use urban expansion model; and (2) urban planners are faced with continuing urban expansion. Numéro de notice : A2014-165 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/tgis.12031 Date de publication en ligne : 17/05/2013 En ligne : https://doi.org/10.1111/tgis.12031 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33070
in Transactions in GIS > vol 18 n° 2 (April 2014) . - pp 219 - 233[article]
Titre : An algebra for spatiotemporal data: From observations to events Type de document : Article/Communication Auteurs : Karine Reis Ferreira, Auteur ; Gilberto Camara, Auteur ; Antônio Miguel V. Monteiro, Auteur Année de publication : 2014 Article en page(s) : pp 253 - 269 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale
[Termes IGN] algèbre
[Termes IGN] analyse spatio-temporelle
[Termes IGN] base de données d'objets mobiles
[Termes IGN] couverture (données géographiques)
[Termes IGN] données spatiotemporelles
[Termes IGN] modélisation
[Termes IGN] risque naturel
[Termes IGN] santé
[Termes IGN] série temporelle
[Termes IGN] service fondé sur la position
[Termes IGN] surveillance écologiqueRésumé : (Auteur) Recent technological advances in geospatial data gathering have created massive data sets with better spatial and temporal resolution than ever before. These large spatiotemporal data sets have motivated a challenge for Geoinformatics: how to model changes and design good quality software. Many existing spatiotemporal data models represent how objects and fields evolve over time. However, to properly capture changes, it is also necessary to describe events. As a contribution to this research, this article presents an algebra for spatiotemporal data. Algebras give formal specifications at a high-level abstraction, independently of programming languages. This helps to develop reliable and expressive applications. Our algebra specifies three data types as generic abstractions built on real-world observations: time series, trajectory and coverage. Based on these abstractions, it defines object and event types. The proposed data types and functions can model and capture changes in a large range of applications, including location-based services, environmental monitoring, public health, and natural disasters. Numéro de notice : A2014-166 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/tgis.12030 Date de publication en ligne : 22/05/2022 En ligne : https://doi.org/10.1111/tgis.12030 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33071
in Transactions in GIS > vol 18 n° 2 (April 2014) . - pp 253 - 269[article]
Titre : Appreciative GIS and strength-based community change Type de document : Article/Communication Auteurs : Paddington Hodza, Auteur Année de publication : 2014 Article en page(s) : pp 270 - 285 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes d'information géographique
[Termes IGN] authentification
[Termes IGN] système d'information géographiqueRésumé : (Auteur) Problem-solving is embedded deeply in the digital DNA of GIS. Most projects involving GIS 1.0 and 2.0 raise community weaknesses, failures and other problems and use them to motivate change. The projects often create a future that does not differ greatly from the past or last long. Although looking into community problems is important and sometimes necessary, the steps of problem-solving do not always leave people feeling happy. To inspire communities to create change based on their strengths and achievements, and to provide better participant experience, this article develops the concept of a new form of GIS called Appreciative GIS (AGIS). AGIS are grounded in the affirmative premise that every community, however challenged, is gifted with certain assets, potentials and strengths which, when effectively exploited, can take that community to a better and sustainable future. Based on Earth's internal structure, the article develops a useful layered community model where crust, mantle and core strata represent the community's body, life-draining and life-giving elements in that order. The model helps explain the different views of the community from current GIS and AGIS perspectives. A Total GIS (TGIS) cube is also developed and used to indicate that current GIS commonly focus on elements of the mantle or what we do not have, what we cannot do and what makes us weak. AGIS, on the other hand, dig up the core and cultivate what we have, what we can possibly do and what makes us strong. In a significant departure from the linear approach of problem-solving, the article suggests implementing AGIS through a 7G cyclical method. The article contends that although AGIS may not be the whole enchilada, they can serve as a beacon of hope and a powerful source of inspiration especially for individuals and groups who are perceived or made to perceive themselves as dysfunctional, weak or poor. Numéro de notice : A2014-167 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/tgis.12046 Date de publication en ligne : 17/05/2013 En ligne : https://doi.org/10.1111/tgis.12046 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33072
in Transactions in GIS > vol 18 n° 2 (April 2014) . - pp 270 - 285[article]
Titre : A comparative analysis of traveling salesman solutions from geographic information systems Type de document : Article/Communication Auteurs : Kevin M. Curtin, Auteur ; Gabriela Voicu, Auteur ; Matthew Rice, Auteur ; Anthony Stefannidis, Auteur Année de publication : 2014 Article en page(s) : pp 286 - 301 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications SIG
[Termes IGN] analyse comparative
[Termes IGN] itinéraire
[Termes IGN] optimisation (mathématiques)
[Termes IGN] problème du voyageur de commerce
[Termes IGN] programmation linéaire
[Termes IGN] système d'information géographiqueRésumé : (Auteur) The Traveling Salesman Problem is one of the most prominent problems in combinatorial optimization, and is regularly employed in a wide variety of applications. The objective of this article is to demonstrate the extent of sub-optimality produced by Traveling Salesman solution procedures implemented in the context of Geographic Information Systems and to discuss the consequences that such solutions have for practice. Toward that end, an analysis is made of Traveling Salesman solutions from implementations in four Geographic Information System packages. These implementations are tested against the optimal solution for a range of problem sizes. Computational results are presented in the context of a school bus routing application. This analysis concludes that no Traveling Salesman implementation in GIS is likely to find the optimal solution when problems exceed 10 stops. In contrast, optimal solutions can be generated with desktop linear programming software for up to 25 cities. Moreover, one GIS implementation consistently found solutions that were closer to optimal than its competitors. This research strongly suggests that for applications with fewer than 25 stops, the use of an optimal solution procedure is advised, and that GIS implementations can benefit from the integration of more robust optimization techniques Numéro de notice : A2014-168 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/tgis.12045 Date de publication en ligne : 09/06/2013 En ligne : https://doi.org/10.1111/tgis.12045 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33073
in Transactions in GIS > vol 18 n° 2 (April 2014) . - pp 286 - 301[article]
Titre : Temporal accuracy in urban growth forecasting : a study using the SLEUTH model Type de document : Article/Communication Auteurs : Gargi Chaudhuri, Auteur ; Keith C. Clarke, Auteur Année de publication : 2014 Article en page(s) : pp 302 - 320 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale
[Termes IGN] aide à la décision
[Termes IGN] changement d'utilisation du sol
[Termes IGN] croissance urbaine
[Termes IGN] Italie
[Termes IGN] Kappa de Cohen
[Termes IGN] modèle de simulation
[Termes IGN] précision des données
[Termes IGN] prévisionRésumé : (Auteur) This study attempts to establish multi-temporal accuracy of the predicted maps produced by a land use change simulation model over time. Validation of the forecasted results is an essential part of predictive modeling and it becomes even more important when the models are used for decision making purposes. The present study uses a popular land use change model called SLEUTH to investigate the temporal trend of accuracy of the predicted maps. The study first investigates the trend of accuracy of the predicted maps from the immediate future to the distant future. Secondly, it investigates the impact of the prediction date range on the accuracy of the predicted maps. The objectives are tested for the city of Gorizia (Italy) using three sets of map comparison techniques, Kappa coefficients, Kappa Simulation and quantity disagreement and allocation disagreement. Results show that, in addition to the model's performance, the decrease in the accuracy of the predicted maps is dependent on factors such as urban history, uncertainty of input data and accuracy of reference maps. Numéro de notice : A2014-169 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/tgis.12047 Date de publication en ligne : 12/09/2013 En ligne : https://doi.org/10.1111/tgis.12047 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33074
in Transactions in GIS > vol 18 n° 2 (April 2014) . - pp 302 - 320[article]
