Surface Parallel Velocities of Rock Glaciers in Daxue Shan, Southeastern Tibetan Plateau, Using SAR Interferometry and SPF Model

This dataset includes annual creeping velocities (2019-2020) of rock glaciers in Daxue Shan, Southeastern Tibet Plateau, estimated by combining ascending and descending InSAR observations with the surface parallel flow model (SPF). Initially, we mapped the velocities of rock glaciers in Daxue Shan from January 2019 to December 2020 using the Small Baseline Subset (SBAS) InSAR algorithm with Sentinel-1A SAR images from both ascending and descending tracks. Subsequently, by amalgamating the LOS measurements from both tracks and the improved surface parallel flow model, we estimated the 3D creeping velocities of the rock glaciers. Finally, we projected the resolved 3D displacement vectors onto the direction parallel to the slope through vector addition.

本数据集涵盖青藏高原东南部大雪山区域2019至2020年的岩石冰川（rock glaciers）年蠕动速率，该数据通过结合升轨与降轨合成孔径雷达干涉测量（InSAR）观测数据与地表平行流模型（surface parallel flow model, SPF）估算得到。研究首先采用小基线集（Small Baseline Subset, SBAS）合成孔径雷达干涉测量算法，利用哨兵-1A（Sentinel-1A）合成孔径雷达（SAR）影像，反演得到2019年1月至2020年12月期间大雪山地区岩石冰川的速度场；随后通过融合两条轨道的视线向（Line of Sight, LOS）观测数据与改进后的地表平行流模型，解算出岩石冰川的三维蠕动速率；最终通过矢量叠加操作，将解算得到的三维位移矢量投影至坡面平行方向。