What do these signs in the Czech Republic mean? [Picture included]

What do these signs in the Czech Republic mean? [Picture included] - Grungy background designed as flag of Germany on shabby wooden board with measure scale

I cannot make sense of these lines and numbers, what do they represent?

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What do these signs in the Czech Republic mean? [Picture included] - Malá Úpa
What do these signs in the Czech Republic mean? [Picture included] - White Concrete Building on Cliff
What do these signs in the Czech Republic mean? [Picture included] - A Shot of Male Taking A Picture in a Mirror of Graffiti





Geography Now! Czech Republic (Czechia)




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Images: vectors icon, Marcin Jozwiak, Mark Warner, Тямаев Миша