Orthoimagery and Shapefiles Documenting Pre- and Post-August 2019 Slope Disturbances, Teller Road Site, Seward Peninsula, Alaska, 2018-2019

• Main Authors: DelVecchio, Joanmarie, Lathrop, Emma, Dann, Julian, Collins, Adam, Rowland, Joel
• Language: unknown
• Published: 2022
• Subjects: 54 Environmental Sciences; Arctic; Seward Peninsula; Tundra; Alaska
• Online Access: http://www.osti.gov/servlets/purl/1886387; https://www.osti.gov/biblio/1886387; https://doi.org/10.5440/1886387

This datasetwas derived from UAS aerial photos and dGPS data collectedat the Tellermile marker47 sitein2018 and 2019 andused to support researchquantifying the timing and rate of surface movements and analyze soil transport process in Arctic landscapes.In July 2018,a Phantom uncrewed aerial system (UAS)collected>6800 high resolution aerial photosof the lower portion of the Teller 47watershed (see for raw photos; pending archive NGA281). During the UAS survey, 25 x 25 cm tile ground control points (GCPs) were laid out andsecured with one rebar rod in the center. The four corners and rebar tops were surveyed with differential GPS, and these coordinates were used to construct and validate an orthomosaic of the site. These points were resurveyed in August 2019 and used to trackannual movement. Changes in position between the two surveys are reportedin (Lathrop et al. 2022; NGA254). Agisoft Metashape photogrammetry software was used to construct a georeferenced orthomosaic image (*.tif file)of a portion (0.68 km2) of the watershed with a final resolution of ~1 cm. Manual delineation ofthe perimeters of failures visible in the UAS imagery(*.tif files)was conducted tocreate shapefile polygons(two *.zip files). The failures were identified by the exposure of bare mineral soils, which were made visibleby disruption of the overlying tundra vegetation. The shapefiles were then usedto analyse the topographic distribution and sizes of the failures. In August 2019an additional ~300 georeferenced UAS imagesof slope instability features were collected (data pending submission) and comparedwiththe 2018 orthomosaic. Overview maps of the failure locations included as a *.pdf. The Next-Generation Ecosystem Experiments: Arctic (NGEE Arctic), was a research effort to reduce uncertainty in Earth System Models by developing a predictive understanding of carbon-rich Arctic ecosystems and feedbacks to climate. NGEE Arctic was supported by the Department of Energy's Office of Biological and Environmental Research. The NGEE Arctic ...