MEaSUREs ITS_LIVE Landsat Image-Pair Glacier and Ice Sheet Surface Velocities, Version 1

This data set, part of NASA's Making Earth System Data Records for Use in Research Environments (MEaSUREs) Program, consists of ice velocities at 240 m resolution, generated from Landsat 4, 5, 7, and 8 optical image pairs. Velocities were derived using the autonomous Repeat Image Feature Tracking algorithm (autoRIFT) processing chain. Data are available for all land ice areas larger than 5 square km, spanning the period from 1985 to 2018 (subject to image availability and quality). Data scarcity and/or low radiometric quality are significant limiting factors for many regions during the earlier years of the data record. Annual, global coverage is nearly complete after the 2013 launch of Landsat 8.

本数据集隶属于美国国家航空航天局（National Aeronautics and Space Administration, NASA）的研究环境用地球系统数据记录制作（Making Earth System Data Records for Use in Research Environments, MEaSUREs）计划，包含分辨率为240米的冰流速数据，该数据由陆地卫星（Landsat）4、5、7、8号的光学影像对生成。冰流速值通过自主重复影像特征追踪算法（autonomous Repeat Image Feature Tracking, autoRIFT）的处理流程推导得到。数据集覆盖所有面积大于5平方千米的陆地冰区域，时间跨度为1985年至2018年，数据可用性受影像获取情况与影像质量制约。在该数据集的早期阶段，诸多区域存在数据稀缺或辐射质量偏低的问题，这是制约数据集应用的显著限制因素。自2013年陆地卫星8号（Landsat 8）发射以来，年度全球覆盖度已基本完备。