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Maximizing spatial congruence of observed and DEM-delineated overland flow networks / T.A. Endreny in International journal of geographical information science IJGIS, vol 17 n° 7 (october 2003)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 17 n° 7 (october 2003) . - pp 699 - 713 Titre : Maximizing spatial congruence of observed and DEM-delineated overland flow networks Type de document : Article/Communication Auteurs : T.A. Endreny, Auteur ; E.F. Wood, Auteur Année de publication : 2003 Article en page(s) : pp 699 - 713 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique [Termes IGN] bassin hydrographique [Termes IGN] congruence [Termes IGN] modèle hydrographique [Termes IGN] modèle numérique de terrain Résumé : (Auteur) Model simulated overland flow is traditionally routed by the terrainbased algorithms that read 90 to 10-m pixel data, yet observed flow is often influenced by submeter micro-terrain features. While sub-meter terrain maps are not available for most watersheds, routing algorithms that bifurcate flow through multiple pixel boundaries may function to match observed runoff patterns. This paper assesses the spatial congruence between observed overland flow from two agricultural hillslopes in New Jersey with 30-m pixel flowpaths predicted by five common routing algorithms known as D8, Multiple Flow, 2D-Lea, (a building block in DEMON), 2D-Jensen, and D-Infinity. The lowest congruence ratings were assigned to D8, which constrained flow to a single neighbour, and MF, which bifurcated flow into all neighbours lower in elevation. 2D-Lea and D-Infinity, algorithms that bifurcated flow to a maximum of two neighbours, achieved the highest accuracy rankings. Simple algorithm modifications that increased D8 bifurcation, and constrained MF bifurcation, resulted in congruence rankings that rivaled the more sophisticated 2D-Lea, 2D-Jensen, and D-Infinity results. These experiments support the use of flow bifurcation schemes that pass flow into a maximum of between two and three pixels when routing polluted runoff. Numéro de notice : A2003-260 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1080/1365881031000135483 En ligne : https://doi.org/10.1080/1365881031000135483 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22555 [article]

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