{ "extent": { "spatial": {"bbox": [[ -180, -90, 180, -56 ]]}, "temporal": {"interval": [[ "2017-01-01T00:00:00.000Z", "2020-08-31T23:59:59.999Z" ]]} }, "stac_version": "1.0.0", "keywords": [ "Antarctic", "Ice Sheet Velocity", "ESA", "CCI", "orthoimagery" ], "description": "This dataset contains monthly gridded ice velocity maps of the Antarctic Ice Sheet derived from Sentinel-1 data acquired between 2017-01-01 and 2020-08-31. 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. 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