| Title | Arctic coastal erosion: UAV-SfM data collection strategies for planimetric and volumetric measurements |
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| Author | Clark, A; Moorman, B; Whalen, D ; Fraser, P |
| Source | Arctic Science 2021 p. 1-29, https://doi.org/10.1139/as-2020-0021  Open Access |
| Image |  |
| Year | 2021 |
| Alt Series | Natural Resources Canada, Contribution Series 20200727 |
| Publisher | Canadian Science Publishing |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf; html |
| Province | Northwest Territories |
| NTS | 107C/10 |
| Area | Summer Island; Crumbling Point; Mackenzie Delta; Kugmallit Bay; Beaufort Sea |
| Lat/Long WENS | -133.9094 -133.8736 69.6067 69.6042 |
| Subjects | environmental geology; surficial geology/geomorphology; Nature and Environment; Science and Technology; coastal environment; coastal erosion; erosion rates; climate effects; climate, arctic; permafrost;
ground ice; sea ice; landslides; slumps; remote sensing; photogrammetric surveys; Climate change; drones; Digital elevation data; Geographic data; Data processing; cumulative effects |
| Illustrations | location maps; geoscientific sketch maps; aerial photographs; 3-D diagrams; digital elevation models; bar graphs; tables; profiles; models |
| Program | Climate Change Geoscience Coastal Infrastructure |
| Program | Polar Continental Shelf Program
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| Released | 2021 02 01 |
| Abstract | Above average warming in the Arctic is leading to increasing permafrost temperatures and a reduction in sea ice cover, which are expected to contribute to increasing rates of Arctic coastal erosion and
sediment release. We studied a 1.5 km stretch of coastline off Richard's Island, Northwest Territories, Canada, consisting of multiple retrogressive thaw slumps (RTSs) with varying degrees of activity over a one-year period. Multi-temporal 2D and 3D
geomorphic analysis was based on unmanned aerial vehicle-Structure-from-Motion (UAV-SfM) data sets collected in 2018 and 2019. Over the observation period, -3.9 m and -1.1 m of planimetric cliff edge and toe retreat occurred, respectively, and
corresponded to an average volumetric change of 8.1 m3/m. The accuracy of UAV-SfM-derived digital elevation models was tested using 12 data collection and processing scenarios, testing the influence of off-nadir camera angle, flight pattern, and
georeferencing strategy. We found that oblique imaging and georeferencing strategy had a large influence on vertical accuracy and variability across the study site and has implications for studying volumetric changes in RTSs. This study furthers the
geomorphological understanding of RTS processes by highlighting the complex relationship between planimetric and volumetric change along rapidly retreating Arctic coasts, and demonstrates advancements in measurement practices for UAV-SfM data sets.
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| Summary | (Plain Language Summary, not published)
This project demonstrates the utility of UAV-SfM for studying rapid coastal retreat in the Arctic by assessing the 3D model accuracy georeferenced by RTK
DG compared to GCP georeferencing with oblique images being incorporated. 33 ground targets where distributed and measured with RTK GNSS at Crumbling Point, NWT with 6 being used as GCP to georeferenced the model during initial processing with the
remaining 27 being used as independent check points which forms the basis of this analysis. The results of this study suggest that by incorporating oblique images with RTK DG improves the vertical accuracy of the resulting 3D models and meets ASPRS
Accuracy Standards for Digital Geospatial Data. |
| GEOSCAN ID | 328140 |
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