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Oblique photogrammetry with visible and thermal images of active lava flows

James, MR; Robson, S; Pinkerton, H; Ball, M; (2006) Oblique photogrammetry with visible and thermal images of active lava flows. B VOLCANOL , 69 (1) 105 - 108. 10.1007/s00445-006-0062-9.

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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 ground-based 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 similar to 100 to 400 m, the corrections result in systematic changes in emissive power of up to 13% with respect to values calculated assuming a uniform average viewing distance across an image.

Type: Article
Title: Oblique photogrammetry with visible and thermal images of active lava flows
DOI: 10.1007/s00445-006-0062-9
Keywords: close-range photogrammetry, Etna volcano, lava flows, thermal imaging, DIGITAL PHOTOGRAMMETRY, VOLCANO, ASTER
UCL classification: UCL > School of BEAMS > Faculty of Engineering Science > Civil, Environmental and Geomatic Engineering
URI: http://discovery.ucl.ac.uk/id/eprint/97534
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