Paru le : 01/07/2002 ISBN/ISSN/EAN : 1365-8816 |
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Code-barres | Cote | Support | Localisation | Section | Disponibilité |
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079-02051 | RAB | Revue | Centre de documentation | En réserve L003 | Disponible |
Dépouillements
Ajouter le résultat dans votre panierResponding to the consequences of uncertainty in geographical data / A. Agumya in International journal of geographical information science IJGIS, vol 16 n° 5 (july 2002)
[article]
Titre : Responding to the consequences of uncertainty in geographical data Type de document : Article/Communication Auteurs : A. Agumya, Auteur ; Gary J. Hunter, Auteur Année de publication : 2002 Article en page(s) : pp 405 - 417 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Information géographique
[Termes IGN] aide à la décision
[Termes IGN] évaluation des données
[Termes IGN] incertitude des données
[Termes IGN] incertitude géométrique
[Termes IGN] information géographiqueNuméro de notice : A2002-147 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810210137031 En ligne : https://doi.org/10.1080/13658810210137031 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22062
in International journal of geographical information science IJGIS > vol 16 n° 5 (july 2002) . - pp 405 - 417[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 079-02051 RAB Revue Centre de documentation En réserve L003 Disponible A method for the formalization and integration of geographical categorizations / Marinos Kavouras in International journal of geographical information science IJGIS, vol 16 n° 5 (july 2002)
[article]
Titre : A method for the formalization and integration of geographical categorizations Type de document : Article/Communication Auteurs : Marinos Kavouras, Auteur ; Margarita Kokla, Auteur Année de publication : 2002 Article en page(s) : pp 439 - 453 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Information géographique
[Termes IGN] base de données localisées
[Termes IGN] formalisation
[Termes IGN] hétérogénéité sémantique
[Termes IGN] information sémantique
[Termes IGN] intégration de données
[Termes IGN] interopérabilité sémantiqueRésumé : (Auteur) In order to deal with semantic heterogeneity and achieve semantic interoperability between heterogeneous applications, it is necessary to formalize geographic knowledge. The present paper introduces a method to formalize and integrate different geographic categorizations. The method is based on the mathematical theory of Concept Lattices. These rich structures are used for managing multidimensional geographic categories and their overlapping relationships. The applicability of the method is tested on the problem of integrating different land cover/land use categorizations. Numéro de notice : A2002-148 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810210129120 En ligne : https://doi.org/10.1080/13658810210129120 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22063
in International journal of geographical information science IJGIS > vol 16 n° 5 (july 2002) . - pp 439 - 453[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 079-02051 RAB Revue Centre de documentation En réserve L003 Disponible Experimental evaluation of positional accuracy estimates from linear network using point- and line-based testing methods / T.G. Van Niel in International journal of geographical information science IJGIS, vol 16 n° 5 (july 2002)
[article]
Titre : Experimental evaluation of positional accuracy estimates from linear network using point- and line-based testing methods Type de document : Article/Communication Auteurs : T.G. Van Niel, Auteur ; T.R. Mc Vicar, Auteur Année de publication : 2002 Article en page(s) : pp 455 - 473 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Information géographique
[Termes IGN] analyse de données
[Termes IGN] estimation de position
[Termes IGN] objet géographique linéaire
[Termes IGN] point d'appui
[Termes IGN] précision géométrique (imagerie)
[Termes IGN] primitive géométrique
[Termes IGN] propagation d'erreur
[Termes IGN] test statistiqueRésumé : (Auteur) Positional accuracy estimates of linear features based on their welldefined points can be significantly different than the accuracy estimates determined from their adjoining lines. A case study was conducted to determine both the cause of this difference as well as the relative effect of the number of points used in calculating the point-based accuracy estimate. Results showed that : (1) the difference between accuracy estimates was primarily due to dissimilar criteria for measuring closeness of primitive features ; and (2) the current US requirement of using 20 well-defined points provided a reasonable estimation of accuracy for the case study. The differences in accuracy estimates described in this study should impact both the definition of geospatial accuracy standards, and the interpretation of geographical analyses with respect to error propagation. Numéro de notice : A2002-149 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810210137022 En ligne : https://doi.org/10.1080/13658810210137022 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22064
in International journal of geographical information science IJGIS > vol 16 n° 5 (july 2002) . - pp 455 - 473[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 079-02051 RAB Revue Centre de documentation En réserve L003 Disponible Errors of signal processing in digital terrain modelling / Igor V. Florinsky in International journal of geographical information science IJGIS, vol 16 n° 5 (july 2002)
[article]
Titre : Errors of signal processing in digital terrain modelling Type de document : Article/Communication Auteurs : Igor V. Florinsky, Auteur Année de publication : 2002 Article en page(s) : pp 475 - 501 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement du signal
[Termes IGN] erreur de rendu
[Termes IGN] modèle numérique de terrain
[Termes IGN] phénomène de Gibbs
[Termes IGN] propagation du signal
[Termes IGN] traitement du signalRésumé : (Auteur) We present new interpretation of three classes of errors in digital terrain models (DTMs) which can be sources of artefacts in DTM-based studies: (a) errors in interpolation of digital elevation models (DEMs) caused by the Gibbs phenomenon; (b) errors in DTM derivation from DEMs with'enhanced' resolution due to noise increase after DEM differentiation; (c) errors in DTM derivation caused by displacement of a DEM grid. Explanation of artefact roots and ways to avoid them are carried out in the context of the theory of signal processing. The Gibbs phenomenon is a specific behaviour of some functions manifested as over- and undershoots near a jump discontinuity. Any DEM includes jump discontinuities of the elevation, such as escarpments and pronounced errors of DEM generation. There are four main ways to prevent or reduce DEM errors caused by the Gibbs phenomenon: (a) decreasing the jump discontinuity before DEM interpolation; (b) using interpolation functions which do not generate the Gibbs phenomenon; (c) omitting over- and undershoots after DEM interpolation; (d) filtering the Gibbs phenomenon. Derivation of topographic variables from DEMs marked by 'enhanced' resolution can lead to artefacts. If a DEM of this kind is interpolated by triangul ati on -based algorithms, triangular patterns may be revealed on maps of topographic variables. If an 'enhanced' resolution of DEM is achieved by the weighted average methods of interpolation, contour 'traces' may be seen on maps. This is because partial derivatives used to calculate some topographic variables are very responsive to high-frequency components of a DEM. To prevent these errors one should use a regular DEM with a grid space relating to an average distance between points in an irregular DEM. Displacement of a grid of points, wherein elevation values are interpolated or determined, influences the derivation of topographic variables (e.g. map design of horizontal and vertical curvatures). Some patterns break, merge, and change their width and length. Small dots, lines, and particles of big patterns can appear and disappear on maps. These effects should be taken into account in the application of these maps to DTM-based geological studies. Numéro de notice : A2002-150 Affiliation des auteurs : non IGN Thématique : IMAGERIE/POSITIONNEMENT Nature : Article DOI : 10.1080/13658810210129139 En ligne : https://doi.org/10.1080/13658810210129139 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22065
in International journal of geographical information science IJGIS > vol 16 n° 5 (july 2002) . - pp 475 - 501[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 079-02051 RAB Revue Centre de documentation En réserve L003 Disponible