Phase-Based Antarctica Ice Velocity Map

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 v_mix.v21May2019.nc (450 m grid spacing). 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 VX and VY and are recorded in m/yr. Error estimates for the velocity components are provided as variables ERRX and ERRY; 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 (STDX,STDY), as well as a count of scenes (CNT) used to estimate the values for each pixel. Finally, the data include the source for the velocity estimates (SOURCE) from tracking-based techniques (=1), phase-based techniques (=2), or interpolation between tracking- and phase-based techniques (=3). Data sources: Platform/Sensor Space Agency ERS-1 & 2/SAR European Space Agency (ESA) RADARSAT-1/SAR Canadian Space Agency (CSA) ENVISAT/ASAR ESA RADARSAT-2/SAR CSA ALOS/PALSAR Japan Aerospace Exploration Agency (JAXA) Sentinel-1a & b ESA Landsat-8/OLI USGS/NASA TanDEM-X/TerraSAR-X/SAR German Space Agency (DLR) ALOS2/PALSAR2 Japan Aerospace Exploration Agency (JAXA) References and Related Publications: Michel, R., and E. Rignot. 1999. Flow of Glacier Moreno, Argentina, from Repeat-Pass Shuttle Imaging Radar Images: Comparison of the Phase Correlation Method with Radar Interferometry. Journal of Glaciology 45(149): 93-100. Mouginot, J., et al. 2017. Comprehensive Annual Ice Sheet Velocity Mapping Using Landsat-8, Sentinel-1, and RADARSAT-2 Data. Remote Sensing 9(4): Art. #364. doi: 10.3390/rs9040364. Mouginot, J., E. Rignot, and B. Scheuchl. 2015. Sustained increase in ice discharge from the Amundsen Sea Embayment, West Antarctica, from 1973 to 2013. Geophysical Research Letters 41: 1576–1584. doi: 10.1002/2013GL059069. Mouginot, J., B. Scheuchl, and E. Rignot. 2012. Mapping of Ice Motion in Antarctica Using Synthetic-Aperture Radar Data. Remote Sensing 4(9): 2753-2767. doi: 10.3390/rs4092753. Rignot, E., J. Mouginot, and B. Scheuchl. 2011. Ice Flow of the Antarctic Ice Sheet. Science 333(6048): 1427-1430. doi: 10.1126/science.1208336. Rignot, E., J. Mouginot, and B. Scheuchl. 2011. Antarctic grounding line mapping from differential satellite radar interferometry. Geophysical Research Letters 38(10): Art. #L10504. doi: 10.1029/2011GL047109. Scheuchl, B., J. Mouginot, and E. Rignot. 2012. Ice velocity changes in the Ross and Ronne sectors observed using satellite radar data from 1997 and 2009. The Cryosphere 6: 1019-1030. doi: 10.5194/tc-6-1019-2012.