inscription
PORTAIL D'INFORMATION GÉOGRAPHIQUE

Résultats de la recherche (315 résultats)

Affinez votre recherche

Par Collection Par Auteur Par Date Par Sujet Par Titre
  • The effect on attribute prediction of location uncertainty in spatial data
  • Error ; Information ; Location ; Simulation ; Spatial analysis ; Spatial statistics ; Statistics
  • Analyse spatiale ; Erreur ; Information ; Localisation ; Simulation ; Statistique ; Statistique spatiale
  • The AA. propose a statistical model for incorporating location error into spatial data analysis. They investigate the effect of location error on the spatial lag, the covariance function, and optimal spatial linear prediction.
  • 2002
  • An exploratory method for analyzing a spatial tessellation in relation to a set of other spatial tessellations
  • Administrative structure ; Algorithm ; Boundary ; India ; Methodology ; Regional analysis ; Spatial analysis ; Spatial autocorrelation ; Spatial system ; Tamil Nadu
  • Algorithme ; Analyse régionale ; Analyse spatiale ; Autocorrélation spatiale ; Inde ; Limite ; Méthodologie ; Structure administrative ; Système spatial ; Tamil Nādu
  • the attention of geographers. They wonder to what extent the development of a spatial tessellation is affected by a set of other tessellations : the A. proposes three methods. They are evaluated through an empirical study, analysis of the administrative system
  • There are various types of spatial tessellations such as administrative units, school districts, and census tracts. Spatial tessellations are often closely related to each other. Such relationships among spatial tessellations have drawn
  • 2002
  • Comparative spatial filtering in regression analysis
  • Methodology ; Regression analysis ; Spatial analysis ; Spatial autocorrelation ; Spatial statistics
  • Analyse de régression ; Analyse spatiale ; Autocorrélation spatiale ; Méthodologie ; Statistique spatiale
  • Comparaison de deux approches du filtrage, qui permettent à ceux qui pratiquent la statistique spatiale de se servir des modèles conventionnels de régression linéaire. L'approche de Getis est basée sur l'autocorrélation observée en utilisant la
  • statistique locale Gi. L'approche de Griffith se sert d'une décomposition de fonction propre basée sur une matrice de connectivité spatiale semblable à celle qui calcule la statistique I de Moran. Application à des données économiques.
  • 2002
  • Matrix analysis ; Regression analysis ; Spatial analysis ; Spatial autocorrelation ; Statistics ; Test
  • Analyse de régression ; Analyse spatiale ; Autocorrélation spatiale ; Calcul matriciel ; Statistique ; Test
  • This approximation outperforms other approximation methods with respect to its accuracy and computational costs. It is capable of handling reference distributions of Moran's I that are subject to significant underlying spatial processes.
  • 2002
  • A general framework for estimation and inference of geographically weighted regression models : 2. Spatial association and model specification tests
  • Error ; Matrix analysis ; Model ; Regression analysis ; Spatial analysis ; Spatial autocorrelation ; Statistics ; Test
  • Analyse de régression ; Analyse spatiale ; Autocorrélation spatiale ; Calcul matriciel ; Erreur ; Modèle ; Statistique ; Test
  • The AA. exploit a recent development that casts GWR as a model of locational heterogeneity, to formulate a general model of spatial effects that includes as special cases GWR with a spatially lagged objective variable and GWR with spatial error
  • 2002
  • Exploring offence statistics in Stockholm City using spatial analysis tools
  • Criminality ; Delinquency ; Regression analysis ; Social change ; Spatial analysis ; Stockholm ; Sweden ; Urban area ; Urban environment ; Urban society
  • Analyse de régression ; Analyse spatiale ; Changement social ; Criminalité ; Délinquance ; Environnement urbain ; Espace urbain ; Société urbaine ; Stockholm ; Suède
  • The objective of this article is to investigate changes since the early 1980s in offence patterns for residential burglary, theft of and from cars, and vandalism in Stockholm City using methods from spatial statistics.
  • 2002
  • Distribution of points ; Mathematics ; Spatial analysis
  • Analyse spatiale ; Distribution de points ; Géométrie ; Mathématique
  • Standard deviational ellipse is not at all an ellipse. The main focus of the paper is to clarify mathematically the actual shape of this curve and to discuss its applications in spatial analysis. This shape changes from a single circle to double
  • 2002
  • Semiparametric maximum likelihood estimates of spatial dependence
  • Estimation ; Housing cost ; Mathematics ; Matrix analysis ; Optimization ; Spatial analysis ; United States of America
  • Analyse spatiale ; Calcul matriciel ; Coût du logement ; Estimation ; Etats-Unis ; Mathématique ; Optimisation
  • By relying on symmetric and doubly stochastic spatial basis matrices that reflect different weight specifications assigned to neighboring observations, the A. derives a mathematical expression for bounds on the log-determinant term that appears
  • 2002
  • Modelling spatial choice : a review and synthesis in a migration context
  • Internal migration ; Interregional migration ; Model ; Origin-destination ; Probability ; Spatial analysis ; Spatial choice ; Spatial competition ; Utility fonction
  • Analyse spatiale ; Choix spatial ; Concurrence spatiale ; Fonction d'utilité ; Migration interrégionale ; Migration intérieure ; Modèle ; Origine-destination ; Probabilité
  • This review draws upon empirical application of spatial choice models to interregional migration and identifies the main research issues. It is argued that some of the widely used models suffer from problems derived from their development
  • in aspatial choice contexts. Evidence from empirical tests of these spatial choice modesl suggests that analysts engaged in interregional migration modelling risk model misspecification if they ignore the peculiarities of spatial choice.
  • 2002
  • Spatial measures of segregation and GIS
  • Geographical information system ; Index ; Measurement ; Methodology ; Segregation ; Spatial analysis
  • Analyse spatiale ; Indice ; Mesure ; Méthodologie ; Système d'information géographique ; Ségrégation
  • A recent effort is to implement several spatial segregation measures as additional GIS tools in a popular desktop GIS package so that researchers and practitioners not savvy in GIS can use these tools to compute spatial segragation indices
  • 2002
  • Combining L1 and L2 norms for a more robust spatial analysis : the meadian attitude
  • Analysis of variance ; Mathematics ; Methodology ; Reliability ; Spatial analysis ; Statistics
  • Analyse de variance ; Analyse spatiale ; Estimateur ; Fiabilité ; Filtrage spatial ; Mathématique ; Médienne ; Méthodologie ; Statistique
  • ses propriétés asymptotiques. L'A. justifie le choix du bootstrap pour l'évaluation des variances et détaille son processus. Présentation de résultats en filtrage spatial et tentative de discussion. Conclusion sur les perspectives du concept d'attitude
  • 2002
  • Decision making and uncertainty : Bayesian analysis of potential flood heights
  • Coastal environment ; Decision making process ; Flood ; Forecast ; Geographical information system ; Global change ; Methodology ; Monte Carlo analysis ; Natural hazards ; Sea level ; Spatial analysis
  • Analyse spatiale ; Changement global ; Crue ; Littoral ; Méthode de Monte Carlo ; Méthodologie ; Niveau marin ; Prévision ; Risque naturel ; Stratégie d'acteurs ; Système d'information géographique
  • This research examines decision making about flooding by joining geographic information system (GIS) methods and spatial analysis to implement Bayesian decision theory. This paper demonstrates the procedure as applied by a hypothetical decision
  • maker concerned with coastal flood controls where flood damage is dependent on the spatial distribution of elevation. A set of known survey points provides the decision maker with limited knowledge of elevation. The method explored in the paper allows
  • 2002
  • AIDS ; Health ; Matrix analysis ; Methodology ; New York City ; Spatial analysis ; United States of America
  • Analyse spatiale ; Calcul matriciel ; Etats-Unis ; Méthodologie ; New York City ; SIDA ; Santé
  • An example of warps analysis as applied to geographic data is presented. It focuses on the AIDS epidemic in two boroughs of New York City. Female adult AIDS incidence and percentage newborns exposed to HIV, by zip code for the years 1991-98
  • , are used to generate annual configurations within an ecological parameter space. A warps analysis of those configurations indicates a clear shift in the relative positions of Manhattan zip codes during the 1990s.
  • 2002
  • Climate and the limits of permafrost : a zonal analysis
  • Air temperature ; Boundary ; Canada ; Climate ; Freezing ; Index ; Model ; Periglacial features ; Permafrost ; Snow ; Soil temperature ; Spatial analysis ; Thawing
  • Analyse spatiale ; Canada ; Climat ; Dégel ; Gel ; Indice ; Limite ; Modèle ; Neige ; Pergélisol ; Périglaciaire ; Température de l'air ; Température du sol
  • This paper defines the climatic and environmental conditions that determine the limits and continuity of permafrost occurrence, in the Canadian context. The analysis utilizes a functional model that links air, surface and permafrost temperature
  • 2002
  • European integration and the spatial dynamics of manufacturing-employment change
  • Branche industrielle ; Compétitivité ; Création d'emploi ; Dynamique spatiale ; Emploi ; Europe ; Industrie ; Intégration européenne ; Localisation ; Shift-share analysis ; Spécialisation ; Union Européenne
  • Competitiveness ; Employment ; Europe ; European Union ; European integration ; Industrial branch ; Industry ; Job creation ; Location ; Shift-share analysis ; Spatial dynamics ; Specialization
  • 2002
  • Rethinking the analysis of ethnic residential patterns : segregation, isolation, or concentration thresholds in Auckland, New Zealand ?
  • Auckland ; Concentration spatiale ; Espace urbain ; Ethnie ; Groupe ethnique ; Indice ; Mesure ; Nouvelle-Zélande ; Ségrégation
  • Auckland ; Ethnic community ; Ethnic group ; Index ; Measurement ; New Zealand ; Segregation ; Spatial concentration ; Urban area
  • Data from the 1996 New Zealand Census on ethnicity in Auckland are used to illustrate a new approach to measuring spatial separation. The method is based on thresholds. This provides more detailed information on the geography of ethnic groups
  • that is consistent with the requirements for testing hypotheses regarding the relationship between social and spatial distance.
  • 2002
  • Spatial economic networks with multicriteria producers and consumers : statics and dynamics
  • Consumption ; Decision ; Market ; Multi-criteria analysis ; Network ; Production ; Spatial economy ; Spatial system ; System dynamics
  • Analyse multicritère ; Consommation ; Dynamique de système ; Décision ; Economie spatiale ; Marché ; Production ; Réseau ; Système spatial
  • Problèmes de décision à critères multiples, tant de la part des firmes que de la part des consommateurs, dans le cadre d'un réseau spatial organisé en système. Critères de la maximisation du profit et de celle de la production. Choix d'itinéraires
  • 2002
  • The spatial anatomy of an epidemic : influenza in London and the county boroughs of England and Wales, 1918-1919
  • Diffusion ; England and Wales ; Epidemic ; Health ; Historical geography ; Spatial analysis ; United Kingdom ; Years 1910-19
  • Analyse spatiale ; Années 1910 ; Diffusion ; England and Wales ; Epidémie ; Grippe ; Géographie historique ; Royaume-Uni ; Santé
  • The paper examines the spatial structure of influenza transmission during the ten-month course of the epidemic (June 1918-April 1919). Through the application of a range of statistical methods, it is shown that the three waves that comprised
  • the pandemic had different spatial and temporal characteristics. The spread of all three waves was underpinned by a clearly defined process of spatial contagion.
  • 2002
  • On the spatial relationship between landslides and causative factors on Lantau Island, Hong Kong
  • Forecast ; Geographical information system ; Hong Kong ; Landslide ; Precipitation ; Slope ; Slope dynamics ; Slope gradient ; Spatial analysis ; Spatial distribution ; Statistics ; Vegetation
  • Analyse spatiale ; Distribution spatiale ; Dynamique de versant ; Glissement de terrain ; Hong Kong ; Pente de versant ; Précipitation ; Prévision ; Statistique ; Système d'information géographique ; Versant ; Végétation
  • This paper presents a statistical approach to study the spatial relationship between landslides and their causative factors at the regional level. The approach is based on digital databases, and incorporates such methods as statistics, spatial
  • pattern analysis, and interactive mapping. First, the environmental settings and landslides in the study area are described. Finally, the results from a Lantau Island case study (1993) are presented and analysed. The advantages and disadvantages
  • 2002
  • Active-layer mapping at regional scales : a 13-year spatial time series for the Kuparuk region, north-central Alaska
  • Active layer ; Alaska ; Freeze-thaw cycle ; Periglacial features ; Permafrost ; Spatial analysis ; Thematic mapping ; Time series ; Years 1990-99
  • Alaska ; Analyse spatiale ; Années 1990 ; Cartographie thématique ; Cycle gel-dégel ; Mollisol ; Pergélisol ; Périglaciaire ; Série chronologique
  • Results from extensive, spatially-oriented field investigations conducted in the Kuparuk River region of north-central Alaska were used in conjunction with a simple analytical procedure to provide a comprehensive analysis of active-layer variability
  • under contemporary climate. This approach, based on Stefan's solution to the heat-conduction problem with phase change, uses air temperature as the forcing function. The analysis of annual thaw-depth fields indicates that interannual climatic variability
  • 2002