*2.2. Test Area Characteristics*

The measurements were carried out by HydroDron-1 [44] on Klodno Lake, which is a gutter-type lake and located in the Kashubian Lake District in Chmielno Commune, in the Kartuzy administrative unit (Pomorskie Province), Poland. Klodno Lake is one of the three Chmielenskie Lakes and lies on the Kolko Radunskie waterway. The Kashubian Route runs along the southern and western coastline of the lake, and the lake itself is connected to Male Brodne Lake and Radunski Dolny Lake through narrow waterways. Radunia river flows through the lake. The total area of the lake is 134.9 ha, the length is 2.0 km, and the maximum depth is 38.5 m. Data presented in the article were taken during a 9 day measurement campaign in April and May 2019.
