Articles | Volume 11, issue 2
https://doi.org/10.5194/amt-11-781-2018
https://doi.org/10.5194/amt-11-781-2018
Research article
 | 
08 Feb 2018
Research article |  | 08 Feb 2018

Improved optical flow velocity analysis in SO2 camera images of volcanic plumes – implications for emission-rate retrievals investigated at Mt Etna, Italy and Guallatiri, Chile

Jonas Gliß, Kerstin Stebel, Arve Kylling, and Aasmund Sudbø

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The paper focusses on gas-velocity retrievals in emission plumes using optical flow (OF) algorithms applied to remote sensing imagery. OF algorithms can measure the velocities on a pixel level between consecutive images. An issue of OF algorithms is that they often fail to detect motion in contrast-poor image areas. A correction based on histograms of an OF vector field is proposed. The new method is applied to two example volcanic data sets from Mt Etna, Italy and Guallatiri, Chile.