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Data supporting 'Empirical correction of systematic orthorectification error in Sentinel-2 velocity fields for Greenlandic outlet glaciers'

<p><strong>Note:&nbsp;An updated dataset covering the majority of Greenland&#39;s marine-terminating glaciers is available as part of the NASA Making Earth System Data Records for Use in Research Environments (MEaSUREs) project through the National Snow and Ice Data Center (NSIDC) at&nbsp;<a href="https://doi.org/10.5067/B28FM2QVVYWY">https://doi.org/10.5067/B28FM2QVVYWY</a>.&nbsp;</strong></p> <p>Data supporting the paper:</p> <blockquote> <p>Chudley, T. R., Howat, I. M., Yadav, B. N., &amp; Noh, M. J. (2022). Empirical correction of systematic orthorectification error in Sentinel-2 velocity fields for Greenlandic outlet glaciers.&nbsp;<em>The Cryosphere.&nbsp;</em>16, 2629&ndash;2642, https://doi.org/10.5194/tc-16-2629-2022</p> </blockquote> <p>Dataset consists of four netCDF files containing stacked Sentinel-2 velocity data of four Greenlandic outlet glaciers (Helheim Glacier, Jakobshavn Isbr&aelig;, Store Glacier, and Kangerlussuaq) between 2017 and 2021. Velocity data are derived and corrected following the methods outlined in Chudley&nbsp;<em>et al.</em>&nbsp;(2022).&nbsp;&nbsp;</p> <p>NetCDF files are created by, and tested to be&nbsp;readable by, Python&#39;s xarray package.</p> <p>The dimensions of the netCDF file are as follows:</p> <ul> <li><strong>X</strong> - <em>x&nbsp;</em>coordinates in NSDIC Sea Ice Polar Stereographic North (EPSG:3413).</li> <li><strong>Y</strong> -&nbsp;<em>y</em>&nbsp;coordinates in NSDIC Sea Ice Polar Stereographic North (EPSG:3413).</li> <li><strong>time</strong> - temporal midpoint of velocity field.</li> </ul> <p>The variables of the netCDF file are as follows:</p> <ul> <li><strong>dmag</strong> - the absolute magnitude of the velocity, in metres per day.</li> <li><strong>dx</strong> - the velocity in the&nbsp;<em>x</em>&nbsp;direction, in metres per day.</li> <li><strong>dy</strong> - the velocity in the&nbsp;<em>y</em>&nbsp;direction, in metres per day.</li> <li><strong>date1</strong> - the date and time of the first scene acquisition.</li> <li><strong>date2</strong> - the date and time of the second scene acquisition.</li> <li><strong>baseline</strong> - the temporal baseline, in days, between scene acquisitions.</li> <li><strong>orbit_pair</strong> - the combination of orbital pathways in the string format &#39;RXXX_RYYY&#39;, where XXX is relative orbit number of the first scene and YYY the relative orbit number of the second scene.</li> <li><strong>mag_rmse</strong> - the root mean square error of the absolute velocity of the off-ice area.&nbsp;</li> <li><strong>dx_mean</strong> - the mean velocity of the off-ice area in the&nbsp;<em>x</em>&nbsp;direction.</li> <li><strong>dx_sd</strong> - the standard deviation of the velocity of the off-ice area in the&nbsp;<em>x</em>&nbsp;direction.</li> <li><strong>dy_mean</strong> -&nbsp;the mean velocity of the off-ice area in the&nbsp;<em>x</em>&nbsp;direction.</li> <li><strong>dy_sd</strong> -&nbsp;the standard deviation of the velocity of the off-ice area in the <em>y</em>&nbsp;direction.</li> </ul>