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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)
[article]
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] ruissellementRésumé : (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
in International journal of geographical information science IJGIS > vol 16 n° 8 (december 2002) . - pp 819 - 842[article]Réservation
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