EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
5/22/2018 | 11:15 AM - 11:30 AM | USE OF STRUCTURE-FROM-MOTION PHOTOGRAMMETRY TO EVALUATE FLUVIAL SUBSTRATES | 410 B
USE OF STRUCTURE-FROM-MOTION PHOTOGRAMMETRY TO EVALUATE FLUVIAL SUBSTRATES
The size structure of native streambed substrates is a key component of stream ecosystems and habitat for communities. To assess habitat and monitor restoration, direct measurements (e.g. pebble counts) are commonly used to characterize streambed substrates, which can be time consuming, biased, and only assess a subsample of substrates available to biota. Alternative methods have been proposed, such as measuring streambed surface roughness using terrestrial laser scanning (TLS). Structure-from-Motion (SfM) is a photogrammetric technique previously used for modeling topographic features, while being more economical than TLS. We are evaluating SfM for conducting more accurate and efficient assessments of instream substrates and habitat by modelling submerged streambed roughness. Lab trials comparing SfM roughness estimates to pebble counts for coarse substrates reveal a strong relationship between the two methods (r2>0.95), and repeated SfM models have a high degree of similarity (mean difference = 1mm). However, in trials with >75% fine sediment this relationship was less strong (r2<0.60) as a result of SfM characterizing detail not captured by pebble count. SfM appears to be an efficient and appropriate alternative to direct substrate measurements across the range of streambed substrates typically observed.
- Structure
- Habitat
- Monitoring
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Presenters/Authors
Brian Danhoff
(), Michigan Technological University, bmdanhof@mtu.edu;
ASHA DISCLOSURE:
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Casey Huckins
(), Michigan Technological University, cjhuckin@mtu.edu;
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