Southwest Greenland Ice Sheet Yearly Ice Velocities dataset from 1984 to 2020

The present dataset is published after the work of Paul Halas, Jérémie Mouginot, Basile de Fleurian and Petra Langebroek on the Southwest of the Greenland Ice Sheet. It provides ice velocity products derived using the processing chain developped by Jérémie Mouginot and collaborators, following the steps described in Romain Millan’s paper ”Mapping Surface Flow Velocity of Glaciers at Regional Scale Using a Multiple Sensors Approach” (https://doi.org/10.3390/rs11212498). In order to derive the velocity fields, we used all available imagery from Landsat 5, Landsat 7 and Landsat 8, from 1984 up to 2021, with less than 40% cloud coverage. Unfortunately, no data was collected for 1984, 1993, 1996, 1997 and 1998. Please also note that the spatial coverage is really limited before 1999. From 2016, satellite imagery from Sentinel-2 is also used, improving the spatial coverage of our velocity maps. In this archive, we provide: • Complete dataset of all velocity fields derived from every image pair; • Yearly median results run through all data for every single pixel; • Yearly GeoTIFF spatial aggregate of all previously computed medians; • The shapefile ”cube grid.shp” describing the grid used for our area. For any question, please contact Paul Halas ([e-mail]).

本数据集基于Paul Halas、Jérémie Mouginot、Basile de Fleurian及Petra Langebroek针对格陵兰冰盖西南部的研究工作公开发布。其提供的冰流速产品由Jérémie Mouginot及其合作者，依据Romain Millan发表的论文《区域尺度冰川表面流速的多传感器制图方法》（https://doi.org/10.3390/rs11212498）中所述流程，通过自研处理链生成。

为获取流速场，研究团队使用了1984年至2021年间所有可用的陆地卫星（Landsat）5号、7号及8号影像，要求云覆盖率低于40%。遗憾的是，1984年、1993年、1996年、1997年及1998年未采集到有效数据。同时需注意，1999年之前的空间覆盖范围极为有限。2016年起，研究团队同步引入哨兵-2号（Sentinel-2）卫星影像，有效提升了流速图的空间覆盖能力。

本存档包包含以下内容：
• 所有影像对生成的流速场完整数据集；
• 针对每个像素基于全量数据计算得到的年度中值结果；
• 所有前述中值结果的年度GeoTIFF空间聚合文件；
• 描述本研究区域所用网格的Shapefile文件"cube grid.shp"。

如有任何疑问，请联系Paul Halas（邮箱：[e-mail]）。