| Summary: | Complete map of ice motion in Antarctica combining phase data in the interior and speckle tracking in the fast-moving sectors. We present a new map of Antarctic ice velocity that is ten times more precise than prior maps and reveals ice motion at a high precision over 80% of the continent versus 20% in the past. The ice motion vector map provides novel constrains on interior ice motion and its connection with the glaciers and ice stream that control the stability and mass balance of the Antarctic Ice Sheet. The data are formatted in Network Common Data Form, Version 4 (NetCDF-4) (.nc) following version 1.6 of the Climate and Forecast (CF) metadata conventions. For more information about working with NetCDF formatted data, visit the UCAR Unidata Network Common Data Form Web site. This data set includes one file named <code>v_mix.v21May2019.nc</code> (450 m grid spacing)<code>.</code> Spatial Coverage: The data set spans the continent of Antarctica. Southernmost Latitude: 90° S Northernmost Latitude: 60° S Westernmost Longitude: 180° W Easternmost Longitude: 180° E Polar stereographic with true scale at 71° S. Refer to Polar Stereographic Projection and Grid page for more information and polar stereographic grid definitions. This data set provides a comprehensive ice velocity map of the Antarctic Ice Sheet posted at 450 m grid spacing. The velocity components for the x and y direction, as defined by the polar stereographic grid, are stored in the NetCDF variables named <code>VX</code> and <code>VY</code> and are recorded in m/yr. Error estimates for the velocity components are provided as variables <code>ERRX</code> and <code>ERRY</code>; however, these values should be used more as an indication of relative quality rather than absolute error. The data also include the standard deviations for the velocity estimates (<code>STDX,STDY</code>), as well as a count of scenes (<code>CNT</code>) used to estimate the values ...
|
|---|