Quality assessment from a hydrological perspective of a digital elevation model derived from WorldView-2 remote sensing data |
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| Authors: | Julio Novoa Karem Chokmani Rody Nigel Philippe Dufour |
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| Institution: | 1. Institut National de la Recherche Scientifique (INRS), Centre Eau-Terre-Environnement (ETE), Québec, Québec, Canadajulio.novoa@ete.inrs.ca;3. Institut National de la Recherche Scientifique (INRS), Centre Eau-Terre-Environnement (ETE), Québec, Québec, Canada;4. CAPSA, St-Raymond, Québec, Canada |
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| Abstract: | AbstractA digital elevation model (DEM) derived from a stereo pair of WorldView-2 (WV-2) images was assessed against ground-truth GPS point datasets. Two assessment methods were used: (a) vertical accuracy assessment and (b) hydrological assessment of surface runoff variables. Three agricultural plots with different topographic slopes were selected to perform a vertical accuracy assessment, followed by a comparative assessment of a set of hydrological variables. The results show an overall vertical accuracy of 0.45 m, confirming the potential of WV-2 stereo images to extract elevation information at high spatial resolution. Concerning plot-scale micro-topographic features, the WV-2 DEM performed better on the plot with rolling slopes (5–10%), extracting variables such as the total length and drainage area of flow paths with relative errors lower than 20%. However, some limitations were detected in the extraction of variables such as terrain slope, drainage points of flow paths and terrain depressions in areas of flatter slopes (<5%). Editor Z.W. Kundzewicz; Associate editor D. Gerten |
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| Keywords: | surface hydrology surface runoff DEM plot scale hydrology WorldView-2 ArcHydro |
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