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Generic query tool for spatio-temporal data / Peter J. M. Van Oosterom in International journal of geographical information science IJGIS, vol 16 n° 8 (december 2002)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 16 n° 8 (december 2002) . - pp 713 - 748 Titre : Generic query tool for spatio-temporal data Type de document : Article/Communication Auteurs : Peter J. M. Van Oosterom, Auteur ; B. Maessen, Auteur ; W. Quak, Auteur Année de publication : 2002 Article en page(s) : pp 713 - 748 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes d'information géographique [Termes IGN] cadastre étranger [Termes IGN] données spatiotemporelles [Termes IGN] données thématiques [Termes IGN] INGRES [Termes IGN] MapInfo [Termes IGN] Oracle [Termes IGN] Pays-Bas [Termes IGN] requête spatiale [Termes IGN] système d'information géographique [Termes IGN] système de gestion de base de données Résumé : (Auteur) Geographical information systems are more and more based on a DBMS with spatial extensions, which is also the case for the system described in this paper. The design and implementation of a generic geographical query tool, a platform for querying multiple spatiotemporal data sets and associated thematic data, is presented. The system is designed to be generic, that is without one specific application in mind. It supports adhoc queries covering both the spatial and the thematic part of the data. The generic geographic query tool will be illustrated with spatial and thematic Cadastral data. Special attention will be given to the temporal aspects: a spatiotemporal data model will be described together with a set of views for easy querying. DBMS views play an important role in the architecture of the system: integration of models, aggregation of information, presentation of temporal data, and so on. The current production version of the geographic query tool within the Dutch Cadastre is based on GeoICT products with a relatively small market share (Ingres and GEO + +). A new prototype version is being developed using mainstream GeoICT products (Oracle and MapInfo). First results and open issues with respect to this prototype are presented. Numéro de notice : A2002-257 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1080/13658810210149399 En ligne : https://doi.org/10.1080/13658810210149399 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22168 [article]

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Scale and orientation-invariant scene similarity metrics for image queries / A. Stefanidis in International journal of geographical information science IJGIS, vol 16 n° 8 (december 2002)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 16 n° 8 (december 2002) . - pp 749 - 772 Titre : Scale and orientation-invariant scene similarity metrics for image queries Type de document : Article/Communication Auteurs : A. Stefanidis, Auteur ; Peggy Agouris, Auteur ; C. Georgiadis, Auteur ; Michela Bertolotto, Auteur ; James D. Carswell, Auteur Année de publication : 2002 Article en page(s) : pp 749 - 772 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes IGN] analyse numérique [Termes IGN] ligne de base [Termes IGN] photo-interprétation assistée par ordinateur [Termes IGN] rectangle englobant minimum [Termes IGN] relation topologique [Termes IGN] requête (informatique) [Termes IGN] similitude [Termes IGN] variation d'échelle Résumé : (Auteur) In this paper, we extend our previous work on shapebased queries to support queries on configurations of image objects. Here we consider spatial reasoning, especially directional and metric object relationships. Existing models for spatial reasoning tend to rely on pre-identified cardinal directions and minimal scale variations, assumptions that cannot be considered as given in our image applications, where orientations and scale may vary substantially, and are often unknown. Accordingly, we have developed the method of varying baselines to identify similarities in direction and distance relations. Our method allows us to evaluate directional similarities without a priori knowledge of cardinal directions, and to compare distance relations even when query scene and database content differ in scale by unknown amounts. We use our method to evaluate similarity between a userdefined query scene and object configurations. Here we present this new method, and discuss its role within a broader image retrieval framework. Numéro de notice : A2002-258 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1080/13658810210148552 En ligne : https://doi.org/10.1080/13658810210148552 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22169 [article]

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Characterisation and generalisation of cartographic lines using Delaunay triangulation / P.M. Van Der Poorten in International journal of geographical information science IJGIS, vol 16 n° 8 (december 2002)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 16 n° 8 (december 2002) . - pp 773 - 794 Titre : Characterisation and generalisation of cartographic lines using Delaunay triangulation Type de document : Article/Communication Auteurs : P.M. Van Der Poorten, Auteur ; Christopher B. Jones, Auteur Année de publication : 2002 Article en page(s) : pp 773 - 794 Langues : Anglais (eng) Descripteur : [Termes IGN] caractérisation [Termes IGN] cohérence des données [Termes IGN] généralisation cartographique automatisée [Termes IGN] objet géographique linéaire [Termes IGN] squelettisation [Termes IGN] triangulation de Delaunay [Vedettes matières IGN] Généralisation Résumé : (Auteur) A method is presented for generalising cartographic lines using an approach based on determination of their structure. Constrained Delaunay triangulation is used to construct a skeleton of the space surrounding the lines and hence represent line features in terms of skeleton branches. Several statistical measures are used to characterise the triangulation branches. The measures enable selective generalisation of different types of line feature, leading to the possibility of userspecification of the style of generalisation. In our implementation of the approach, the triangulation is updated dynamically to allow both sides of multiple lines to be processed, while guaranteeing topological consistency between the resulting generalised lines. Numéro de notice : A2002-259 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810210149434 En ligne : https://doi.org/10.1080/13658810210149434 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22170 [article]

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Calibration of stochastic cellular automata: the application to rural-urban land conversions / F. Wu in International journal of geographical information science IJGIS, vol 16 n° 8 (december 2002)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 16 n° 8 (december 2002) . - pp 795 - 818 Titre : Calibration of stochastic cellular automata: the application to rural-urban land conversions Type de document : Article/Communication Auteurs : F. Wu, Auteur Année de publication : 2002 Article en page(s) : pp 795 - 818 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Télédétection [Termes IGN] analyse multicritère [Termes IGN] automate cellulaire [Termes IGN] Chine [Termes IGN] croissance urbaine [Termes IGN] réseau neuronal artificiel [Termes IGN] simulation de surface Résumé : (Auteur) Despite the recognition of cellular automata (CA) as a flexible and powerful tool for urban growth simulation, the calibration of CA had been largely heuristic until recent efforts to incorporate multicriteria evaluation and artificial neural network into rule definition. This study developed a stochastic CA model, which derives its initial probability of simulation from observed sequential land use data. Furthermore, this initial probability is updated dynamically through local rules based on the strength of neighbourhood development. Consequentially the integration of global (static) and local (dynamic) factors produces more realistic simulation results. The procedure of calibrated CA can be applied in other contexts with minimum modification. In this study we applied the procedure to simulate ruralurban land conversions in the city of Guangzhou, China. Moreover, the study suggests the need to examine the result of CA through spatial, tabular and structural validation. Numéro de notice : A2002-260 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1080/13658810210157769 En ligne : https://doi.org/10.1080/13658810210157769 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22171 [article]

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Error assessment of grid-based flow routing algorithms used in hydrological models / Q. Zhou in International journal of geographical information science IJGIS, vol 16 n° 8 (december 2002)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 16 n° 8 (december 2002) . - pp 819 - 842 Titre : Error assessment of grid-based flow routing algorithms used in hydrological models Type de document : Article/Communication Auteurs : Q. Zhou, Auteur ; X. Liu, Auteur Année de publication : 2002 Article en page(s) : pp 819 - 842 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique [Termes IGN] erreur [Termes IGN] modèle hydrographique [Termes IGN] modèle numérique de surface [Termes IGN] pente [Termes IGN] ruissellement Résumé : (Auteur) This paper reports an investigation on the accuracy of gridbased routing algorithms used in hydrological models. A quantitative methodology has been developed for objective and dataindependent assessment of errors generated from the algorithms that extract hydrological parameters from gridded DEM. The generic approach is to use artificial surfaces that can be described by a mathematical model, thus the 'true' output value can be predetermined to avoid uncertainty caused by uncontrollable data errors. Four mathematical surfaces based on all ellipsoid (representing convex slopes), an inverse ellipsoid (representing concave slopes), saddle and plane were generated and the theoretical 'true' value of the Specific Catchment Area (SCA) at any given point on the surfaces could be computed using mathematical inference. Based on these models, tests were made on a number of algorithms for SCA computation. The actual output values from these algorithms on the convex, concave, saddle and plane surfaces were compared with the theoretical 'true' values, and the errors were then analysed statistically. The strengths and weaknesses of the selected algorithms are also discussed. Numéro de notice : A2002-261 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1080/13658810210149425 En ligne : https://doi.org/10.1080/13658810210149425 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22172 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-02081	RAB	Revue	Centre de documentation	En réserve L003	Disponible