Dataset for Kinematic Changes throughout the 2013-2021 Surge Cycle of Sít' Kusá

• Main Authors: Liu, Jukes, Enderlin, Ellyn, Bartholomaus, Timothy C., Terleth, Yoram, Beaud, Flavien, Mikesell, Thomas Dylan
• Format: Text
• Language: unknown
• Published: ScholarWorks 2023
• Subjects: glacier change; surging glaciers; surface elevation change; glacier; glaciers; Alaska
• Online Access: https://scholarworks.boisestate.edu/cryogars_data/3; https://doi.org/10.18122/cryogars_data.3.boisestate

This data repository contains digital elevation models, terminus area traces, and velocity maps for Sít' Kusá (Turner Glacier) associated with a paper documenting the glacier's 2013-2021 surge cycle.Digital elevation models:These are ~2-m resolution Digital Elevation Models (DEMs) generated from WorldView image stereo pairs over Sít' Kusá (Turner Glacier), southeast Alaska, and are in UTM 7N projection (EPSG:32607). All files are labeled by the date of acquisition with format YYYYMMDD. The geotiffs from 2013-2019 were provided directly by the Polar Geospatial Center. The 20180122_UTM_mosaic.tif was generated from the 20180117 and 20180128 DSMs. The 2021 DSM was generated using the NASA AMES Stereo Pipeline. The standard vertical uncertainty for these DSMs is 2 meters.Terminus area traces:The terminus area polygons were traced from 2013-2022 using the tie points from Nolan and others (2021) and are available as layers in the SK_term_pos.shp. The surface area (area_km2) and source image (IMG_ID) associated with each traced polygon can be found in the feature attributes. The IMG_ID contains the date associated with the trace.Velocity maps:The velocity maps produced using a custom template-matching algorithm called autoRIFT (https://github.com/nasa-jpl/autoRIFT) are available as geotiffs labeled by the acquisition dates of the satellite image pairs utilized (YYYYMMDD), the chip size (also the spatial resolution of the map) in meters, and the platform (S2 = Sentinel-2, LS = Landsat 8). For each file, Band 1 corresponds to the x-direction velocity (vx), Band 2 corresponds to the y-direction velocity (vy), and Band 3 corresponds to the magnitude of velocity, i.e., speed. All velocities are in meters/year.The accompanying Table1_autorift_vmap_parameters_SK.csv contains additional data corresponding to the provided velocity maps, including the date separation of the image pair in days (dt_days), the central date for the pair (mid_date), the chip size (min_chip_size), the percentage of pixels with data over the glacier ...