{"type": "Collection", "id": "ice-sheet-velocity-antarctic-2021", "stac_version": "1.0.0", "description": "This dataset contains monthly gridded ice velocity maps of the Antarctic Ice Sheet derived from Sentinel-1 data acquired between 2021-01-01 and 2021-12-31. It was generated by ENVEO, as part of the ESA Antarctic Ice Sheet Climate Change Initiative project (Antarctic_Ice_Sheet_cci). The surface velocity is derived by applying feature tracking techniques using Sentinel-1 synthetic aperture radar (SAR) data acquired in the Interferometric Wide (IW) swath mode. Ice velocity is provided at 200m grid spacing in Polar Stereographic projection (EPSG: 3031). The horizontal velocity components are provided in true meters per day, towards easting and northing direction of the grid. The vertical displacement is derived from a digital elevation model. Provided is a NetCDF file with the velocity components: vx, vy, vz, along with maps showing the magnitude of the horizontal components, the valid pixel count and uncertainty. The product combines all ice velocity maps, based on 6- and 12-day repeats, acquired within a single month in a monthly averaged product.", "links": [{"rel": "root", "href": "../../catalog.json", "type": "application/json", "title": "Open Science Catalog"}, {"rel": "child", "href": "https://s3.waw2-1.cloudferro.com/swift/v1/AUTH_3f7e5dd853f54cebb046a29a69f1bba6/Catalogs/4DANTARCTICA/antarctic-ice-sheet-velocity-monthly-2021/catalog.json", "type": "application/json", "title": "Items"}, {"rel": "via", "href": "https://cryoportal.enveo.at/data_files/2021-ESACCI-L3C-AIS-IV-S1-1M_200m-fv1.1_20220420.zip", "title": "Access"}, {"rel": "via", "href": "https://climate.esa.int/en/projects/ice-sheets-antarctic/", "title": "Documentation"}, {"rel": "parent", "href": "../catalog.json", "type": "application/json", "title": "Products"}, {"rel": "related", "href": "../../projects/4d-antarctica/collection.json", "type": "application/json", "title": "Project: 4D-ANTARCTICA"}, {"rel": "related", "href": "../../themes/cryosphere/catalog.json", "type": "application/json", "title": "Theme: Cryosphere"}, {"rel": "related", "href": "../../variables/ice-velocity/catalog.json", "type": "application/json", "title": "Variable: Ice Velocity"}, {"rel": "related", "href": "../../eo-missions/sentinel-1/catalog.json", "type": "application/json", "title": "EO Mission: Sentinel-1"}], "stac_extensions": ["https://stac-extensions.github.io/osc/v1.0.0-rc.2/schema.json"], "osc:themes": ["Cryosphere"], "osc:missions": ["Sentinel-1"], "osc:project": "4D-ANTARCTICA", "osc:variables": ["Ice Velocity"], "osc:status": "completed", "osc:region": "Antarctica", "osc:type": "product", "osc:standard_name": "ice-sheet-velocity-antarctic-2021", "created": "2022-04-20T00:00:00Z", "version": "1.0", "start_datetime": "2021-01-01T00:00:00Z", "end_datetime": "2021-12-31T23:59:59Z", "updated": "2024-04-10T11:39:59Z", "title": "Antarctic Ice Sheet monthly ice velocity - 2021", "extent": {"spatial": {"bbox": [[-180.0, -90.0, 180.0, -63.0]]}, "temporal": {"interval": [["2021-01-01T00:00:00Z", "2021-12-31T23:59:59Z"]]}}, "license": "proprietary", "keywords": ["Snow/Ice", "Ice Velocity", "Terrestrial Hydrosphere", "theme:Cryosphere", "variable:Ice Velocity", "mission:Sentinel-1", "region:Antarctica", "project:4D-ANTARCTICA"]}