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DEM resolution dependencies of terrain attributes across a landscape / Y. Deng in International journal of geographical information science IJGIS, vol 21 n° 1-2 (january 2007)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 21 n° 1-2 (january 2007) . - pp 187 - 213 Titre : DEM resolution dependencies of terrain attributes across a landscape Type de document : Article/Communication Auteurs : Y. Deng, Auteur ; B.O. Bauers, Auteur ; J.P. Wilson, Auteur Année de publication : 2007 Article en page(s) : pp 187 - 213 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes IGN] analyse de groupement [Termes IGN] attribut géomètrique [Termes IGN] classification non dirigée [Termes IGN] corrélation [Termes IGN] échantillonnage d'image [Termes IGN] limite de résolution géométrique [Termes IGN] modèle numérique de surface [Termes IGN] régression [Termes IGN] relief Résumé : (Auteur) This paper documents resolution dependencies in terrain analysis and describes how they vary across landform location. Six terrain attributes were evaluated as a function of DEM resolution—slope, plan curvature, profile curvature, north–south slope orientation, east–west slope orientation, and topographic wetness index. The research highlights the effect of varying spatial resolution through a spatial sampling/resampling scheme while maintaining sets of indexed sample points at various resolutions. Tested sample points therefore coincide exactly between two directly compared resolutions in terms of their location and elevation value. An unsupervised landform classification procedure based on statistical clustering algorithms was employed to define landform classes in a reproducible manner. Correlation and regression analyses identified sensitive and consistent responses for each attribute as resolution was changed, although the tested terrain attributes responded in characteristically different ways. These responses displayed distinguishable patterns among various landform classes, a conclusion that was further verified by a series of two-sample, two-tailed t-tests. Copyright Taylor & Francis Numéro de notice : A2007-032 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1080/13658810600894364 En ligne : https://doi.org/10.1080/13658810600894364 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28398 [article]

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