Fig. 2From: Assessment of the 2021 summer flood in Central EuropeBend of the Ahr River close to Laach before (left, Google satellite 2015) and after (right, unoccupied aerial vehicle, UAV. Picture by Physical Geography and Geoecology). The red line indicates the area of UAV coverage. Notice the trees on the left picture and the broad gravel floor on the rightBack to article page