Improved Antarctic-Wide Ice Flow Maps from Landsat 8 Imagery

Here, we present a methodology which can automatically calibrate, mosaic, and post-process Landsat images into displacement maps, resulting in seamless, continent-wide, ice velocity products. Using this developed methodology, we have assembled over 200,000 displacement maps to generate Antarctic-wide annual mosaics of ice velocity maps from more than 70,000 Landsat 8 images acquired between December 2013 and April 2019. The new suite of annual Antarctic ice velocity maps at 105-m grid spacing provide the clearest picture of Antarctic-wide ice flow to-date, and error analysis via comparisons with various available prior ice velocity data products and in situ data confirmed the improved accuracy of this new data product.

本研究提出一种可自动对陆地卫星（Landsat）图像进行校正、镶嵌与后处理，并将其转换为位移图的方法，可生成无缝覆盖全域的冰流速产品。依托本研究开发的该方法，我们基于2013年12月至2019年4月间获取的7万余幅陆地卫星8号（Landsat 8）影像，整合得到超过20万张位移图，进而生成全南极范围的年度冰流速镶嵌图。这套全新的年度南极冰流速产品采用105米的网格间距，为当前全南极冰流分布提供了迄今为止最为清晰的刻画；通过与多款现有冰流速数据产品及原位观测数据开展比对误差分析，证实了该新型数据集的精度提升效果。