SLIDE 1
Project Goals
¨ Evaluate UAS-based
photogrammetry system
¨ Accuracy comparison to
ground survey
¨ Geomorphic change
measurement
SenseFly eBee UAS
Ground survey: RIEGL VZ-1000 TLS TopCon HiperLite+ GPS
Using Unmanned Aircraft System (UAS) Photogrammetry to Monitor Bank - - PowerPoint PPT Presentation
Using Unmanned Aircraft System (UAS) Photogrammetry to Monitor Bank - - PowerPoint PPT Presentation
Using Unmanned Aircraft System (UAS) Photogrammetry to Monitor Bank Erosion along River Corridors 08-Jan-2018 Scott D. Hamshaw, Ph.D., P.E. Project Goals Evaluate UAS-based photogrammetry system Accuracy comparison to SenseFly eBee UAS
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SLIDE 3
What we get from UAS
1.
Orthomosaic imagery
2.
Photogrammetric point cloud (RGB colorized)
3.
Derived products:
n Digital surface model (DSM) n Digital elevation model (DEM)
Filtering and/or Machine learning classification and processing Computer vision: Structure-from-motion (SfM) & multi-view stereo
SLIDE 4
Orthomosaic imagery
3.2 cm UAS 0.5 m Ortho 1 m NAIP
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Photogrammetric point cloud
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Digital elevation and surface models
DSM DEM Airborne LiDAR DEM
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Accuracy Assessment – X-Sections
¨ 11 cm vertical / 28 cm horizontal
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Accuracy Assessment - GCPs
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Field Data Collection
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Data collection metrics
Year Number
- f flights
Total Length of River Surveyed (km) Mean Length
- f River per
Flight (m) Total days** in field for surveying Number of days impacted* by weather 2015 55 21.7 395 12 3 2016 18 13.7 760 5 5 2017 17 14.3 843 4 1
¨ 43% of survey days rescheduled/shortened ¨ 2-3 person survey team ¨ Direct georeferenecing with sparse GCPs for check
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Geomorphic Change Detection Volumetric Change Analysis
¨ Difference of DEMs (DoD) ‘12 ALS to ‘17 UAS ¨ Net change of -19,920 m3
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Geomorphic Change Detection Cross Section Analysis
3.5 m2
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UAS for monitoring river corridors
¨ Optimal survey time: early spring ¨ Sparse network of GCPs = check / bias adjustment ¨ Vegetation density dependent ¨ Technology rapidly developing (during project)
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Contact Info & Acknowledgements
14
¨ Scott Hamshaw, Ph.D., P.E.
¤ Vermont EPSCoR | 23 Mansfield Ave, Burlington, VT ¤ scott.hamshaw@uvm.edu ¤ 802.324.6221
¨
Support provided by: ¤ Vermont Water Resources and Lake Studies Center
¤
Vermont EPSCoR with (NSF) Grant EPS-1101317 and EPS-1556770
¤
NSF Graduate Research Fellowship (Grant No. DGE-0925179NSF)
¤
Robert & Patricia Switzer Foundation
¤
University of Vermont
Special thanks to co-authors:
- Mandar Dewoolkar
- Jarlath O’Neil-Dunne
- Donna Rizzo
- Tayler Engel
- Jeff Frolik
SLIDE 15
Quantifying Streambank Movement and Topography Using Unmanned Aircraft System Photogrammetry with Comparison to Terrestrial Laser Scanning River Research and Applications 33 (8):1354–67. https://doi.org/10.1002/rra.3183.
Supplementary Information
SLIDE 16
River corridor vegetation
Spring ‘12 Fall ‘15 Spring ‘17 Summer ‘16
Bristol Flats, New Haven River
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DoDs – New Haven River
2017 - 2016 2016 - 2012
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DoDs – New Haven River
2015 - 2012 2015 - 2012
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