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Abstract: A time history of images are collected at the northern Gold Coast ARGUS coastal imaging station, where high-rise buildings cast shadows that extend across the beach from the dune to the foreshore. In this paper, we discuss a video-based measurement of the subaerial beach profile that capitalizes on the presence of shadows cast on the beach surface. Specifically, a method is described to transform the 2-D imaged shadow edges to 3-D topographic information using geometric relationships between the plane of the observed shadow and the camera. Limited field testing of the application at an ARGUS station located at the US Army Engineer R&D Center's Field Research Facility indicates accuracy on the order of a centimetre depending on range and imaging system parameters. It is anticipated that this unique use of shadows will provide a mechanism to quantify the dynamic nature of northern Gold Coast foreshore profile evolution over temporal and spatial scales not readily obtained by a traditional survey team.

To cite this article: Curtis, William R; Holman, Rob A and Turner, Ian L. Northern Gold Coast Beach Topography from Imaged Shadow Observations [online]. In: Townsend, Murray Robert (Editor); Walker, David (Editor). Coasts and Ports 2005 : Coastal Living - Living Coast; Australasian Conference; Proceedings. Barton, A.C.T.: Institution of Engineers, Australia, 2005: 489-492. Availability: <http://search.informit.com.au/documentSummary;dn=500089722811995;res=IELENG> ISBN: 0646451308. [cited 28 Mar 17].

Personal Author: Curtis, William R; Holman, Rob A; Turner, Ian L; Source: In: Townsend, Murray Robert (Editor); Walker, David (Editor). Coasts and Ports 2005 : Coastal Living - Living Coast; Australasian Conference; Proceedings. Barton, A.C.T.: Institution of Engineers, Australia, 2005: 489-492. DOI: Document Type: Conference Paper, Research ISBN: 0646451308 Subject: Coastal mapping; Coastal zone management; Shorelines--Monitoring; Video recording--Data processing; Affiliation: (1) U.S. Army Engineer Research and Development Center
(2) Department of Oceanic and Atmospheric Sciences, Oregon State University
(3) Water Research Laboratory, School of Civil and Environmental Engineering, University of New South Wales

Database: Engineering Collection