USAP-DC

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{"@context": "https://schema.org/", "@type": "Dataset", "@id": "https://www.usap-dc.org/view/dataset/602084", "additionalType": ["geolink:Dataset", "vivo:Dataset"], "name": "Fracture traces of the \"Daggers\" on Thwaites Eastern Ice Shelf (2016-2026)", "description": "This dataset includes a shapefiles of traces of a set of fractures extending from the pinning ridge on the Thwaites Eastern Ice Shelf in West Antarctica (the \"Daggers\"). Fractures were manually-digitized as line features by two independent analysts (shapefiles corresponding to \"MS\" and \"ZB\", respectively) from monthly Sentinel-1 Synthetic Aperture Radar (SAR) images between January 2016 and January 2026. \r\n
\r\n
Attribute tables for each shapefile contain fields for: \"Crevasse ID\" and \"Date\".\r\n
Crevasse IDs are in order from East to West (Crevasse 1-5). \r\n
Dates refer to the date of the Sentinel-1 image from which the fracture was traced, recorded as as integers in the format 'yyyymmdd'", "citation": "Sharp, M., Alley, K., Beiergrohslein, Z., Luckman, A., Muto, A., Pettit, E. C., et al. (2026) \"Fracture traces of the \"Daggers\" on Thwaites Eastern Ice Shelf (2016-2026)\" U.S. Antarctic Program (USAP) Data Center. doi: https://doi.org/None.", "datePublished": "2026-08-13", "keywords": ["Antarctica", "Basal Crevassing", "Crevasses", "Cryosphere", "Ice Shelf", "Ice Shelf Fracture", "Thwaites"], "creator": [{"@type": "Person", "additionalType": "geolink:Person", "name": "Alley, Karen", "email": "karen.alley@umanitoba.ca", "affiliation": {"@type": "Organization", "name": null}}, {"@type": "Person", "additionalType": "geolink:Person", "name": "Beiergrohslein, Zoee", "email": null, "affiliation": {"@type": "Organization", "name": null}}, {"@type": "Person", "additionalType": "geolink:Person", "name": "Luckman, Adrian", "email": null, "affiliation": {"@type": "Organization", "name": null}}, {"@type": "Person", "additionalType": "geolink:Person", "name": "Muto, Atsu", "email": "amuto@temple.edu", "affiliation": {"@type": "Organization", "name": "CIRES 449 UCB"}}, {"@type": "Person", "additionalType": "geolink:Person", "name": "Pettit, Erin", "email": "pettiter@oregonstate.edu", "affiliation": {"@type": "Organization", "name": "Box 351310, Seattle, Washington 98195-1310, USA"}}, {"@type": "Person", "additionalType": "geolink:Person", "name": "Sauret, Genevieve", "email": null, "affiliation": {"@type": "Organization", "name": null}}, {"@type": "Person", "additionalType": "geolink:Person", "name": "Sharp, Meghan", "email": "sharpmeg@oregonstate.edu", "affiliation": {"@type": "Organization", "name": null}}, {"@type": "Person", "additionalType": "geolink:Person", "name": "Truffer, Martin", "email": "mtruffer2@alaska.edu", "affiliation": {"@type": "Organization", "name": "Physics Department, University of Alaska Fairbanks, P.O. Box 755920, 401 ELV"}}, {"@type": "Person", "additionalType": "geolink:Person", "name": "Wild, Christian", "email": "christian.wild@uni-tuebingen.de", "affiliation": {"@type": "Organization", "name": null}}], "distribution": [{"@type": "DataDownload", "additionalType": "http://www.w3.org/ns/dcat#DataCatalog", "encodingFormat": "text/xml", "name": "ISO Metadata Document", "url": "https://www.usap-dc.org/metadata/isoxml/602084iso.xml", "contentUrl": "/dataset/filename"}, {"@type": "DataDownload", "@id": "https://www.usap-dc.org/view/dataset/602084", "additionalType": "dcat:distribution", "url": "https://www.usap-dc.org/view/dataset/602084", "contentUrl": "/dataset/filename", "encodingFormat": "text/html"}, {"@type": "DataDownload", "@id": "https://www.usap-dc.org/view/dataset/602084", "additionalType": "dcat:distribution", "url": "https://www.usap-dc.org/view/dataset/602084", "contentUrl": "/dataset/filename", "encodingFormat": "text/html"}], "identifier": {"@type": "PropertyValue", "url": "https://www.usap-dc.org/view/dataset/602084", "value": "https://www.usap-dc.org/view/dataset/602084"}, "contributor": [{"@type": "Role", "roleName": "credit", "description": "funderName:NSF:GEO:OPP:Antarctic Glaciology awardNumber:1929991 awardTitle:NSF-NERC: Thwaites-Amundsen Regional Survey and Network (TARSAN) Integrating Atmosphere-Ice-Ocean Processes affecting the Sub-Ice-Shelf Environment"}], "license": [{"@type": "CreativeWork", "URL": "https://creativecommons.org/licenses/by/4.0/", "name": "MD_Constraints", "description": "useLimitation: Creative Commons Attribution Only v4.0 Generic [CC BY 4.0]."}, {"@type": "CreativeWork", "name": "MD_LegalConstraints", "description": "accessConstraints: license. otherConstraints: Creative Commons Attribution Only v4.0 Generic [CC BY 4.0]."}, {"@type": "CreativeWork", "name": "MD_SecurityConstraints", "description": "classification: "}], "publisher": {"@type": "Organization", "name": "U.S. Antarctic Program (USAP) Data Center"}, "spatialCoverage": [{"@type": "Place", "geo": {"@type": "GeoShape", "box": "-75.03, -105.82, -74.85, -105.51"}}]}

Fracture traces of the "Daggers" on Thwaites Eastern Ice Shelf (2016-2026) Cite as Sharp, M., Alley, K., Beiergrohslein, Z., Luckman, A., Muto, A., Pettit, E. C., et al. (2026) "Fracture traces of the "Daggers" on Thwaites Eastern Ice Shelf (2016-2026)" U.S. Antarctic Program (USAP) Data Center. doi: https://doi.org/None. Abstract This dataset includes a shapefiles of traces of a set of fractures extending from the pinning ridge on the Thwaites Eastern Ice Shelf in West Antarctica (the "Daggers"). Fractures were manually-digitized as line features by two independent analysts (shapefiles corresponding to "MS" and "ZB", respectively) from monthly Sentinel-1 Synthetic Aperture Radar (SAR) images between January 2016 and January 2026. Attribute tables for each shapefile contain fields for: "Crevasse ID" and "Date". Crevasse IDs are in order from East to West (Crevasse 1-5). Dates refer to the date of the Sentinel-1 image from which the fracture was traced, recorded as as integers in the format 'yyyymmdd' Creator(s): Sharp, Meghan; Pettit, Erin; Beiergrohslein, Zoee; Alley, Karen; Truffer, Martin; Muto, Atsu; Luckman, Adrian; Wild, Christian; Sauret, Genevieve Date Created: 2026-08-14 Repository: USAP-DC (current) License: Creative Commons Attribution Only v4.0 Generic [CC BY 4.0] Spatial Extent(s) West: -105.82, East: -105.51, South: -75.03, North: -74.85 Temporal Extent(s) Start: 2026-08-13 - End: 2026-08-13 Award(s) NSF 1929991 Version: 1 Related Project(s) NSF-NERC: Thwaites-Amundsen Regional Survey and Network (TARSAN) Integrating Atmosphere-Ice-Ocean Processes affecting the Sub-Ice-Shelf Environment Keywords Antarctica Basal Crevassing Crevasses Cryosphere Ice Shelf Ice Shelf Fracture Thwaites