Bathymetric Structure-from-Motion: Change Detection and Technical Improvements

Authors: James T. Dietrich*, University of Northern Iowa, Amy Woodget, University of Worcester
Topics: Water Resources and Hydrology, Remote Sensing
Keywords: Fluvial change detection, Structure from Motion, bathymetry
Session Type: Poster
Day: 4/12/2018
Start / End Time: 8:00 AM / 9:40 AM
Room: Napoleon Foyer/Common St. Corridor, Sheraton, 3rd Floor
Presentation File: No File Uploaded

Quantifying the rates of geomorphic change is critical for a range of applications within river science and management, including monitoring the evolution of river restoration and assessing the impacts of flow modifications and engineering structures on habitat availability. The tools available for monitoring small river systems at high spatial resolutions are growing with the adoption/availability of airborne/terrestrial laser scanning data and Structure from Motion (SfM)-based photogrammetry. Monitoring the bathymetry of these smaller stream systems is still limited to traditional survey techniques and these methods do not provide spatially continuous data and can overlook important changes at a range of spatial scales. Recently, we have advanced our capabilities for spatially continuous surveying of fluvial geomorphology, at finer spatial scales using unmanned aerial systems (UAS) and SfM photogrammetry. These advances include the collection of high-spatial resolution bathymetric data in clear water systems using a refraction correction method for SfM data. In this research, we highlight several methodological improvements for the bathymetric SfM process and assess the potential for refraction corrected SfM data to be used for change detection in the lowland River Teme in Herefordshire, UK.

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