Abstract
A methodology for the measurement of height in water reservoirs is developed. It is based on Sentinel 2 imagery and aerial LiDAR data. The methodology is automatized using Matlab software and focused on image processing techniques (equalization, binarization, and edge detection) combined with LiDAR data processing (near neighbour search and height averaging). It is applied in a region of interest selected by the user characterized by a water–land interface. Results are validated in the As Conchas water reservoir (Spain) using an in situ sensing system provided by the Hydrographic Miño-Sil Confederation. The duration of the experiment was one year. The Sentinel 2 bands B2, B3, B4, and B8 were tested during this study. The best results for water height evaluation were obtained for band B8 (842 nm) with an error of 0.20 m and a standard deviation of 0.17 m. The time resolution of the technique depends on the Sentinel 2 revisit time. The time resolution and height accuracy could be improved using complementary satellite systems.
Highlights
Due to climate change, drought episodes are becoming more frequent in regions that traditionally did not face this problem
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A methodology for the evaluation of height value of water reservoirs was developed. It is based on the combination of free data from Sentinel 2 imagery and digital elevation models from aerial LiDAR, provided by national cartographic institutes
Summary
Drought episodes are becoming more frequent in regions that traditionally did not face this problem. Galicia, a typically rainy Spanish region, experienced drought phenomena during the summer and autumn of 2017. One example in Galicia is the Hydrographic Miño-Sil Confederation [1], which is responsible for the management of one of the main hydrological basins of the region Their data acquisition is based on in situ sensors that provide parameters as water level, flow, or chemical components. In this sense, the initiative described by Tauro et al [2] must be noted, as it describes the works of the measurements and observation activities carried out by the XXI Century Working Group of the Association of Hydrological Sciences. This group combines hydrologists with experts in other fields such as robotics and electronics
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