Two-year velocity and strain-rate averages from the Thwaites Eastern Ice Shelf, 2001-2020

This dataset includes GeoTiffs of two-year averages of ice flow velocity (including x- and y-components and flow speed) and longitudinal, transverse, and shear strain rates for the Thwaites Eastern Ice Shelf (TEIS) from 2001-2020. The grids were derived from feature tracking on MODIS, Landsat-7, and Landsat-8 imagery. Each pixel in a grid represents the median value of a stack of all available pixels for each time period. Data are gridded at a 500 m spatial resolution in a polar stereographic (EPSG:3031) projection. Speed units are m/day and strain rates are in units of /day. In addition, we provide videos of each variable (excluding x- and y-velocity components) placed alongside a MODIS image of the same extent and from around the same time to provide context. In addition to the variables noted above, we include videos for flow direction (in degrees from grid north in an EPSG:3031 projection) and a zoomed-in version of flow direction, which were calculated from the provided grids.

本数据集包含2001-2020年思韦茨东冰架（Thwaites Eastern Ice Shelf, TEIS）的两年平均冰流速度（含x、y分量及流速大小）、纵向、横向与剪切应变率的GeoTIFF格式数据。该网格数据通过对MODIS、Landsat-7与Landsat-8影像开展特征追踪得到。网格内的每个像素代表对应时段内所有可用像素堆叠结果的中值。数据采用极地立体投影（EPSG:3031），空间分辨率为500米。流速单位为米/天，应变率单位为天⁻¹。此外，我们还提供除流速x、y分量外的各变量的视频，将其与覆盖范围一致、时段相近的MODIS影像并置，以提供背景参考。除上述变量外，我们还提供了流向（以EPSG:3031投影下的网格北为基准的角度）及其放大版本的视频，二者均由本数据集提供的网格计算得出。