Along flow acceleration of the Greenland ice sheet

The acceleration of Greenland ice flow derived from ITS_LIVE annual velocity data spanning 1985-2018. There are two variations of using either weighted and unweighted least squares in the estimation. The data files follow the format: weighted--ax.tif | acceleration in the x direction: weighted--ay.tif | acceleration in the y-direction. weighted--a.tif | acceleration in the dominant flow direction weighted--asigma.tif | standard error estimate of the "weighted--a" data. weighted--N.tif | Number of years with data for each grid point. All data are using a polar stereographic projection (EPSG:3413). This dataset was created as part of the study: Grinsted et al. 2022, Accelerating ice flow at the onset of the Northeast Greenland ice stream. Processing choices is detailed there.基于1985-2018年ITS_LIVE年度速度数据推导得到的格陵兰冰流加速度。 本次估算采用了加权最小二乘与非加权最小二乘两种方法变体。数据文件格式如下： weighted--ax.tif：x方向加速度数据 weighted--ay.tif：y方向加速度数据 weighted--a.tif：主流动方向加速度数据 weighted--asigma.tif：weighted--a数据集的标准误差估计值 weighted--N.tif：各网格点的有效数据年数 所有数据均采用极射赤平投影（EPSG:3413）。 本数据集作为Grinsted等人2022年发表的研究《东北格陵兰冰流启动阶段的冰流加速》的一部分构建而成，相关处理细节已在该文献中详述。