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Combined Digital Photogrammetry and Time-of-Flight Laser Scanning for Monitoring Cliff Evolution

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Abstract:

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.

Keywords: coastal retreat; digital photogrammetry; high-resolution monitoring; laser scanning; rock cliffs

Document Type: Research Article

DOI: http://dx.doi.org/10.1111/j.1477-9730.2005.00315.x

Affiliations: 1: ( ), Email: michael.lim@durham.ac.uk 2: ( ), Email: d.n.petley@durham.ac.uk 3: ( ), Email: n.j.rosser@durham.ac.uk 4: ( ), Email: r.j.allison@durham.ac.uk 5: ( ) University of Durham, Email: a.j.long@durham.ac.uk 6: ( ) Cleveland Potash Ltd, Saltburn-by-the-Sea, UK, Email: david.pybus@clevelandpotash.co.uk

Publication date: June 1, 2005

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