Thermal photogrammetric imaging:a new technique for monitoring dome eruptions

Thiele, Samuel T. and Varley, Nick and James, Mike R. (2017) Thermal photogrammetric imaging:a new technique for monitoring dome eruptions. Journal of Volcanology and Geothermal Research, 337. pp. 140-145. ISSN 0377-0273

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Abstract

Structure-from-motion (SfM) algorithms greatly facilitate the generation of 3-D topographic models from photographs and can form a valuable component of hazard monitoring at active volcanic domes. However, model generation from visible imagery can be prevented due to poor lighting conditions or surface obscuration by degassing. Here, we show that thermal images can be used in a SfM workflow to mitigate these issues and provide more continuous time-series data than visible counterparts. We demonstrate our methodology by producing georeferenced photogrammetric models from 30 near-monthly overflights of the lava dome that formed at Volcán de Colima (Mexico) between 2013 and 2015. Comparison of thermal models with equivalents generated from visible-light photographs from a consumer digital single lens reflex (DSLR) camera suggests that, despite being less detailed than their DSLR counterparts, the thermal models are more than adequate reconstructions of dome geometry, giving volume estimates within 10% of those derived using the DSLR. Significantly, we were able to construct thermal models in situations where degassing and poor lighting prevented the construction of models from DSLR imagery, providing substantially better data continuity than would have otherwise been possible. We conclude that thermal photogrammetry provides a useful new tool for monitoring effusive volcanic activity and assessing associated volcanic risks.

Item Type:
Journal Article
Journal or Publication Title:
Journal of Volcanology and Geothermal Research
Additional Information:
This is the author’s version of a work that was accepted for publication in Journal of Volcanology and Geothermal Research. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Volcanology and Geothermal Research., 337, 2017 DOI: 10.1016/j.jvolgeores.2017.03.022
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1900/1908
Subjects:
ID Code:
85672
Deposited By:
Deposited On:
23 Mar 2017 11:08
Refereed?:
Yes
Published?:
Published
Last Modified:
29 Sep 2020 03:29