Footprints of structure-from-motion digital elevation models and orthophotographs created of Fall Creek Lake, Oregon, from data acquired during annual drawdown to streambed November 2016
Dates
Publication Date
2020-03-09
Start Date
2016-11-08
End Date
2016-11-10
Citation
Keith, M.K., and Mangano, J.F., 2020, Structure-from-motion datasets of Fall Creek Lake, Oregon, acquired during annual drawdown to streambed November 2016: U.S. Geological Survey data release, https://doi.org/10.5066/P9AYWU8Z.
Summary
The Middle Fork Willamette River basin encompasses 3,548 square kilometers of western Oregon and drains to the mainstem Willamette River. Fall Creek basin encompasses 653 square kilometers and drains to the Middle Fork Willamette River. In cooperation with the U.S. Army Corps of Engineers, the U.S. Geological Survey evaluated geomorphic responses of downstream river corridors to annual drawdowns to streambed at Fall Creek Lake. This study of geomorphic change is focused on the major alluvial channel segments downstream of the U.S. Army Corps of Engineers’ dams on Fall Creek and the Middle Fork Willamette River, as well as the 736 hectare Fall Creek Lake. Reservoir erosion during streambed drawdown results in sediment delivery to downstream [...]
Summary
The Middle Fork Willamette River basin encompasses 3,548 square kilometers of western Oregon and drains to the mainstem Willamette River. Fall Creek basin encompasses 653 square kilometers and drains to the Middle Fork Willamette River. In cooperation with the U.S. Army Corps of Engineers, the U.S. Geological Survey evaluated geomorphic responses of downstream river corridors to annual drawdowns to streambed at Fall Creek Lake. This study of geomorphic change is focused on the major alluvial channel segments downstream of the U.S. Army Corps of Engineers’ dams on Fall Creek and the Middle Fork Willamette River, as well as the 736 hectare Fall Creek Lake. Reservoir erosion during streambed drawdown results in sediment delivery to downstream reaches. To better understand patterns and processes of reservoir erosion related to downstream geomorphic responses, detailed reservoir deposit mapping and change analyses are completed. To support these analyses, aerial photographs were collected via unmanned aerial systems (UAS) on November 8 and November 9, 2016, and via Cessna aircraft (or manned aerial system; MAS) on November 10, 2016, to create 3-dimensional xyz point clouds, digital elevation models (DEMs), and orthophotographs of the Fall Creek Lake bottom during full reservoir drawdown using structure-from-motion (SfM) techniques. The November 8 model resulted in a ground resolution of 3.28 centimeters per pixel, average point density of 58.2 points per square meter, and DEM resolution of 13.1 centimeters per cell. The November 9 model resulted in a ground resolution on 2.86 centimeters per pixel, average point density of 76.6 points per square meter, and DEM resolution of 11.4 centimeters per cell. The model for the manned aerial system (MAS) flight on November 10 had a slightly lower ground resolution at 4.18 centimeters per pixel (for multiple altitudes), average point density of 35.8 points per square meter, and output DEM resolution of 16.7 centimeters per cell. Cell sizes were automatically generated by the software.
This documentation describes a polygon shapefile including the footprints of structure-from-motion DEMs and orthophotographs created of Fall Creek Lake, Oregon, from data acquired during annual drawdown to streambed in November 2016. This dataset is part of a broader publication including aerial photographs, 3-dimensional xyz point clouds, DEMs, orthophotographs, model processing reports, ground control points, and dataset footprints for November 8-10, 2016.
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FallCreekLake_2016_sfm_footprints_meta.xml Original FGDC Metadata
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fc_dem_and_ortho_footprints.zip
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Purpose
The raw photographs, point clouds, DEMs, and orthophotographs (herein collectively referred to as SfM datasets) covering Fall Creek Lake support detailed mapping of reservoir deposits and quantitative reservoir change analyses related to the streambed drawdown during water year 2017 (WY2017). The detailed mapping was primarily based on the November 10, 2016, SfM datasets and provide a basis for evaluating geomorphic context of eroded or deposited sediment relative to other (November 8 and 9) SfM datasets collected in WY2017, lidar of the reservoir collected in 2012, as well as other elevation datasets collected in the future. These datasets also provide basis for characterizing future geomorphic and topographic changes in Fall Creek Lake.
