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Spatial resolution and algorithm choice as modifiers of downslope flow computed from digital elevation models / K. Clarke in Cartography and Geographic Information Science, vol 34 n° 3 (July 2007)  

Public [article]  inCartography and Geographic Information Science > vol 34 n° 3 (July 2007) . - pp 215 - 230 Titre : Spatial resolution and algorithm choice as modifiers of downslope flow computed from digital elevation models Type de document : Article/Communication Auteurs : K. Clarke, Auteur ; S.J. Lee, Auteur Année de publication : 2007 Article en page(s) : pp 215 - 230 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale [Termes IGN] Californie (Etats-Unis) [Termes IGN] écoulement des eaux [Termes IGN] limite de résolution géométrique [Termes IGN] Matlab [Termes IGN] modèle numérique de terrain [Termes IGN] pente [Termes IGN] représentation du relief Résumé : (Auteur) This research investigated the dependence of computing downslope flow from digital elevation models (DEMs) on two basic elements of the flow calculation: the spatial resolution of the DEM and the algorithm used to compute the downslope flow, specifically how it defines topographic slope and aspect. Six algorithms for downslope flow and downslope accumulation were implemented in MATLAB using different assumptions about components of the computation from the terrain analysis literature. We analyzed the results of downslope flow statistically, thresholded the values to yield streams, and compared the different results with the actual surface streams in the National Hydrographic Database. We repeated the computations using DEMs of 3-m, 30-m, and 90-m resolutions, covering a test area near Santa Barbara, California. We conclude that downslope flow computations are overestimates, and that they are fraught with critical algorithmic assumptions and scale effects. They should be approached with great caution in GIS-based analyses. Copyright CaGISociety Numéro de notice : A2007-394 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1559/152304007781697875 En ligne : https://doi.org/10.1559/152304007781697875 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28757 [article]

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