Fig. 2
From: Volcanic plume measurements using a UAV for the 2014 Mt. Ontake eruption
a Photograph of the multirotor UAV (αUAV series) used in the campaigns with the MultiGAS box (black box) attached under it. A white adhesive sheet-type dust sampler was attached on the green body of the UAV. The photograph was taken on November 20, 2014, before the flight. b Photograph of the UAV just after taking off from point B (Fig. 1b) for the thermal camera flight. Background is Mt. Ontake emitting volcanic plume