Combined Digital Photogrammetry and Time-of-Flight Laser Scanning for Monitoring Cliff Evolution |
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| Authors: | Michael Lim David N Petley Nicholas J Rosser Robert J Allison Antony J Long and David Pybus |
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| Institution: | ();, ();, ();, ();, () University of Durham;and () Cleveland Potash Ltd, Saltburn-by-the-Sea, UK |
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| Abstract: | Although cliffs form approximately 75% of the world's coastline, the understanding of the processes through which they evolve remains limited because of a lack of quantitative data on the morphological changes they undergo. In this paper the combination of terrestrial time-of-flight laser scanning with high-resolution digital photogrammetry is examined to generate high-quality data-sets pertaining to the geomorphic processes governing cliff development. The study was undertaken on a section of hard rock cliffs in North Yorkshire, UK, which has been monitored over a 12-month period. High-density, laser-scanned point clouds have been used to produce an accurate representation of these complex surfaces, free from the optical variations that degrade photographic data. These data-sets have been combined with high-resolution photographic monitoring, resampled with the fixed accuracies of the terrestrial laser survey, to generate a new approach to recording the volumetric changes in complex coastal cliffs. This has led to significant improvements in the understanding of the activity patterns of coastal cliffs. |
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| Keywords: | coastal retreat digital photogrammetry high-resolution monitoring laser scanning rock cliffs |
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