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Oblique photogrammetry with visible and thermal images of active lava flows.

James, Mike R. and Robson, Stuart and Pinkerton, Harry and Ball, Matthew (2006) Oblique photogrammetry with visible and thermal images of active lava flows. Bulletin of Volcanology, 69 (1). pp. 105-108. ISSN 1432-0819

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Abstract

Digital images from hand-held cameras are increasingly being acquired for scientific purposes, particularly where non-contact measurement is required. However, they frequently consist of oblique views with significant camera-to-object depth variations and occlusions that complicate quantitative analyses. Here, we report the use of oblique photogrammetric techniques to determine ground-based thermal camera orientations (position and pointing direction), and to generate scene information for lava flows at Mount Etna, Sicily. Multiple images from a consumer grade digital SLR camera are used to construct a topographic model and reference associated groundbased thermal imagery. We present data collected during the 2004–2005 eruption and use the derived surface model to apply viewing distance corrections (to account for atmospheric attenuation) to the thermal images on a pixel by pixel basis. For viewing distances of ~100 to 400 m, the corrections result in systematic changes in emissive power of up to ±3% with respect to values calculated assuming a uniform average viewing distance across an image.

Item Type: Article
Journal or Publication Title: Bulletin of Volcanology
Uncontrolled Keywords: Close-range photogrammetry - Etna volcano - Lava flows - Thermal imaging
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 27946
Deposited By: Dr Mike R. James
Deposited On: 26 Oct 2009 10:08
Refereed?: Yes
Published?: Published
Last Modified: 24 Jan 2014 05:17
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/27946

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