Contribution of the UAS to the determination of the water budget in a coastal wetland: a case study in the natural park of the Bay of Cádiz (SW Spain)
| Autor: | Verónica Ruiz-Ortiz, Luis Barbero, Ángel Sánchez-Bellón, Santiago García-López |
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| Rok vydání: | 2018 |
| Předmět: |
Atmospheric Science
010504 meteorology & atmospheric sciences 0208 environmental biotechnology Wetland water budget 02 engineering and technology 01 natural sciences lcsh:Oceanography Natural park low-cost photogrammetry lcsh:GC1-1581 digital terrain model (DTM) Computers in Earth Sciences Water budget 0105 earth and related environmental sciences General Environmental Science geography geography.geographical_feature_category structure from motion Applied Mathematics lcsh:QE1-996.5 020801 environmental engineering lcsh:Geology Wetlands Environmental science unmanned aerial systems (UAS) Water resource management Bay |
| Zdroj: | European Journal of Remote Sensing, Vol 51, Iss 1, Pp 965-977 (2018) |
| ISSN: | 2279-7254 |
| Popis: | Wetlands are sensitive and complex systems whose conservation is a priority. For the correct understanding of their hydrological dynamics, it is necessary to determine the different elements of the water budget and, in particular, the geometry of the wetland basin in order to estimate the variations in storage capacity. This paper presents a novel, low-cost, user-friendly photogrammetric technique to obtain high-resolution datasets using non-metric cameras located in unmanned aerial systems (UAS) and structure-from-motion algorithms for producing high-precision 3D point clouds. The accuracy of the cartographic products obtained is evaluated using 59 checkpoints and comparing with the available LiDAR models. Best results are obtained using a full frame RGB sensor, which results in an orthomosaic with a pixel size of 1.38 cm and a positional RMSE of 3.8 cm in horizontal and a digital surface model (DSM) with a 3.5 cm RMSEZ. From the DSM, eliminating the influence of vegetation through masks, a digital terrain model (DTM) with a 5.9-cm RMSEZ that allows defining the filling curve of the wetland basin is obtained. This curve relates the stored volume and the surface exposed to evaporation with the water level, which allows to perform simulations in the balance models. |
| Databáze: | OpenAIRE |
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