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Quantifying Fluvial Substrate Size using Hyperspatial Resolution UAS Imagery and SfM-photogrammetry

Woodget, Amy and Visser, Fleur and Maddock, Ian and Carbonneau, P. (2015) Quantifying Fluvial Substrate Size using Hyperspatial Resolution UAS Imagery and SfM-photogrammetry. In: 11th International Symposium on Ecohydraulics 2016, 7th - 12th February 2016, Melbourne, Australia.

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Abstract

The size and distribution of substrate within fluvial environments plays a fundamental role in the availability of aquatic habitats. Remote sensing approaches to substrate size quantification have previously provided coarse grain size outputs (c. 1m) at the catchment scale and very fine resolution outputs (c. 1mm) at the patch scale. Within this paper we assess the potential of a novel approach for rapidly providing hyperspatial resolution (c. 1cm) substrate size outputs at the intermediate mesoscale. This scale is of relevance to rapid habitat assessments within a riverscape style framework. Our approach uses imagery acquired from an unmanned aerial system (UAS) and processed using structure-from-motion (SfM) photogrammetry. We test this method on a 120m reach of a small, shallow river in the English Lake District. We explore the value of SfM point cloud roughness values for developing a predictive relationship with field-measured substrate size. Jack knife analyses indicate that our model is capable of predicting grain sizes with an average residual error of -0.011cm and standard deviation of 1.64cm. We show that our UAS-SfM method offers a rapid, flexible, high spatial resolution, spatially continuous and spatially explicit approach for quantifying fluvial grain size. However, poor precision of grain size estimates suggests that further refinement of our approach is required. With further testing and on-going developments in the capabilities of UAS and associated SfM software, our method may provide a viable method for quantitative, mesoscale river habitat assessments in the future.

Item Type: Conference or Workshop Item (Paper)
Additional Information:

The full-text cannot be supplied for the full conference paper. The extended abstract can be accessed via the official URL.

Uncontrolled Keywords: size, distribution, fluvial environments, novel approach, hyperspatial resolution, structure-from-motion (SfM) photogrammetry
Subjects: G Geography. Anthropology. Recreation > G Geography (General)
G Geography. Anthropology. Recreation > GB Physical geography
G Geography. Anthropology. Recreation > GE Environmental Sciences
Divisions: Academic Departments > Institute of Science and the Environment
Related URLs:
Depositing User: Amy Woodget
Date Deposited: 22 Nov 2016 14:00
Last Modified: 22 Nov 2016 14:00
URI: https://eprints.worc.ac.uk/id/eprint/5094

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