Multi-year mosaics of Antarctic ice motion from satellite radar interferometry: 1995 to 2022

The SAR data employed in this study have been acquired under the umbrella of the Polar Space Task Group (PSTG), which was established under the auspices of the World Meteorological Organization (WMO) Executive Council Panel of Experts on Polar Observations Research and Services. The group mandate was to provide coordination across International Space Agencies to facilitate acquisition and distribution of fundamental satellite datasets in support of polar science. Independently, the Landsat Science team independently provided the Landsat project at the United States Geological Survey with specific recommendations for ice sheet wide acquisitions for Landsat-8. For the 1995-2001 map, we employ ERS-1/2 and RADARSAT-1 SAR data. For the 2007-2009 map, we employed ERS-2 SAR, Envisat ASAR, ALOS PALSAR and RADARSAT-2. For the 2014-2016 and 2020-2022 maps, we employed S1-a/b, RADARSAT-2, and Landsat-8 data. The processing algorithms is described in "Mouginot, J., Rignot, E., Scheuchl, B., & Millan, R. (2017). Comprehensive annual ice sheet velocity mapping using Landsat-8, Sentinel-1, and RADARSAT-2 data. Remote Sensing, 9(4), 364." The gridded velocity data is posted at 450 m. These data are accompanied by time-dependent shape files of the ice front and grounding line positions derived from optical and SAR data, error maps for the velocity products, and amplitude imagery. The error is a weighted average of the nominal error in speed from each sensor. The products are distributed in NetCDF format in Polar Stereographic (ESPG 3031) projection with true scale at 71 degree South.

本研究使用的合成孔径雷达（Synthetic Aperture Radar, SAR）数据由极地空间任务组（Polar Space Task Group, PSTG）采集，该工作组由世界气象组织（World Meteorological Organization, WMO）极地观测研究与服务专家小组委员会设立，其职责为协调各国际空间机构，推动基础卫星数据集的获取与分发，以支撑极地科学研究。此外，美国地质调查局（United States Geological Survey, USGS）的陆地卫星（Landsat）科学团队独立提交了针对陆地卫星8号（Landsat-8）冰盖全域成像任务的专项建议。针对1995-2001年的冰盖速度图，本研究采用了欧洲遥感卫星1/2号（European Remote-Sensing Satellite 1/2, ERS-1/2）与雷达卫星1号（RADARSAT-1）的SAR数据；2007-2009年的冰盖速度图，则采用了欧洲遥感卫星2号（ERS-2）、环境卫星（Envisat）先进合成孔径雷达（Advanced Synthetic Aperture Radar, ASAR）、先进陆地观测卫星（Advanced Land Observing Satellite, ALOS）相控阵型合成孔径雷达（Phased Array type L-band Synthetic Aperture Radar, PALSAR）以及雷达卫星2号（RADARSAT-2）的SAR数据；2014-2016年与2020-2022年的冰盖速度图，本研究采用了哨兵1号A/B星（Sentinel-1a/b）、雷达卫星2号（RADARSAT-2）以及陆地卫星8号（Landsat-8）的数据。本研究的处理算法详见论文："Mouginot, J., Rignot, E., Scheuchl, B., & Millan, R. (2017). Comprehensive annual ice sheet velocity mapping using Landsat-8, Sentinel-1, and RADARSAT-2 data. Remote Sensing, 9(4), 364."，其译名为《基于陆地卫星8号、哨兵1号与雷达卫星2号数据的年度冰盖速度综合制图》。本研究发布的网格化速度数据分辨率为450米，配套数据集包括基于光学与SAR数据提取的冰缘线与接地线位置的时变矢量文件、速度产品误差分布图以及振幅影像。其中，速度产品的误差为各传感器标称测速误差的加权平均值。本数据集以NetCDF格式分发，采用极地立体投影（Polar Stereographic, ESPG 3031），南纬71度处为该投影的真实比例尺。