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Title: Automated extraction of free surface topography using SfM-MVS photogrammetry
Authors: Ferreira, Edgar
Chandler, Jim H.
Wackrow, Rene
Shiono, Koji
Keywords: Eco-hydraulics
Free surface measurement
Laboratory studies
SfM-MVS photogrammetry
Issue Date: 2017
Publisher: Elsevier / © The Authors
Citation: FERREIRA, E. ... et al, 2017. Automated extraction of free surface topography using SfM-MVS photogrammetry. Flow Measurement and Instrumentation, 54, pp. 243-249.
Abstract: This paper describes a spatial measurement technique to measure the free surface of natural fluid flows in laboratory applications. This effective solution is based on “Structure-from- Motion/Multi-view Stereo” (SfM-MVS) photogrammetry and is capable of reconstructing water surface morphology, both at an instant and with a high spatial resolution. The efficiency and accuracy of the method is dependent upon the acquisition of high quality imagery (i.e. sharply focussed, no motion blur) with appropriate multi-frame camera coverage and configuration, and data processing must utilise appropriate camera calibration data. The potential of the technique for developing hydraulic understanding is demonstrated using two contrasting approaches. First, the water surface behind a living vegetation element is analysed along a single transect. Second, the full three-dimensional characteristics of the captured water surfaces are examined using statistical methods which demonstrate surface dissimilarity between vegetated and non-vegetated cases. The technique is transferable to real-world field sites.
Description: This is an Open Access article published by Elsevier and distributed under the terms of the Creative Commons Attribution Licence, CC BY 4.0, https://creativecommons.org/licenses/by/4.0/
Sponsor: This work was supported by the Engineering and Physical Sciences Research Council (EPSRC) [Grant: EP/K004891/1].
Version: Published
DOI: 10.1016/j.flowmeasinst.2017.02.001
URI: https://dspace.lboro.ac.uk/2134/24311
Publisher Link: http://dx.doi.org/10.1016/j.flowmeasinst.2017.02.001
ISSN: 0955-5986
Appears in Collections:Published Articles (Architecture, Building and Civil Engineering)

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