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Earth, Planets and Space
Fig. 1 | Earth, Planets and Space

Fig. 1

From: Water sampling using a drone at Yugama crater lake, Kusatsu-Shirane volcano, Japan

Fig. 1

Location and topography of Kusatsu-Shirane volcano. a Location map of Kusatsu-Shirane volcano within Japan (marked by a star). b Topographic map of Kusatsu-Shirane volcano. Solid lines are topographic contours at intervals of 10 m. “A” and “B” correspond to the takeoff/landing site and water sampling site, respectively. Regular sampling of lake water by hand has been carried out at site U1. Red line indicates the flight route for water sampling on October 18, 2017. The circle indicates a distance of 1 km from the center of Yugama crater lake

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