Sun glitter at Gallur:
A good example of sun glitter while the drone raises and films oriented towards the sun, however it can be helpful to determine a correlation between surface reflectance and roughness, and related flow speed.
Optical processing can assist to define bathymetry:
Shallow flows with relatively transparent water, captured by 4K camera drones and filtered by computer, can help to define the bathymetry without more expensive data acquisition. See this example nearby "Sotos del Ebro, Alfaro".
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