Callow, J. N., May, S. M. and Leopold, M. (2018). Drone photogrammetry and KMeans point cloud filtering to create high resolution topographic and inundation models of coastal sediment archives. Earth Surf. Process. Landf., 43 (12). S. 2603 - 2616. HOBOKEN: WILEY. ISSN 1096-9837

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Abstract

Coastal areas are vulnerable to the impacts of tropical cyclones (TC), tsunamis and other water super-elevation events, but the frequency of these events is often poorly represented by conventional records. Coastal overwash deposits (including washover fans) can provide a longer-term archive of event frequency. Because of their low-gradient geomorphic form, washover fans require high accuracy (centimetre-resolution) topographic models to understand patterns of connectivity and dynamics that control archive formation. Using images collected by a remotely piloted aircraft system (RPAS, or drone') and Structure-from-Motion (SfM) photogrammetry techniques, we apply a novel point-cloud filtering technique based on KMeans classification of the R-G-B colour of each X-Y-Z point to remove vegetation and create a centimetre-resolution and accuracy bare-earth digital terrain model (DTM) of a washover fan in Exmouth Gulf (Western Australia). Using the RPAS-SfM orphophoto and DEM data, supported by ground-penetrating radar (GPR) and field stratigraphic analysis, we show how this approach can be applied to understand dynamics controlling low-gradient geomorphic landforms, using an example of a washover fan sedimentary archive in northwestern Australia created by extreme overwash events. Our approach reveals the likely role of backflooding and terrestrial runoff in creating backwater environment for sub-aqueous deposition and good sediment preservation and identifies key areas to target for detailed dating and stratigraphic analysis of a potentially decadal to sub-millennial resolution sediment archive of TC activity. Copyright (c) 2018 John Wiley & Sons, Ltd.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Callow, J. N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
May, S. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Leopold, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-172354
DOI: 10.1002/esp.4419
Journal or Publication Title: Earth Surf. Process. Landf.
Volume: 43
Number: 12
Page Range: S. 2603 - 2616
Date: 2018
Publisher: WILEY
Place of Publication: HOBOKEN
ISSN: 1096-9837
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
STRUCTURE-FROM-MOTION; TROPICAL CYCLONE ACTIVITY; AERIAL VEHICLE UAV; EXMOUTH GULF; LIDAR DATA; NORTHWESTERN AUSTRALIA; WESTERN-AUSTRALIA; BARRIER ISLANDS; OVERWASH; SCALEMultiple languages
Geography, Physical; Geosciences, MultidisciplinaryMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/17235

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